Industrial Automation

CJ3M-CPU3[] / -CPU1[] / CJ2M-MD21[]

CJ-series CJ3M CPU Units, Pulse I/O Modules

CJ Series continues. And evolves. Ideal for basic equipment upgrades and expansion

last update: October 1, 2026

General Specifications

Item		CJ3M-CPU1[]/3[]
Enclosure		Mounted in a panel
Grounding		Less than 100 Ω
CPU Unit Dimensions		CJ3M-CPU1[] 90 mm × 75 mm × 31 mm (H × D × W) CJ3M-CPU3[] 90 mm × 75 mm × 62 mm (H × D × W)
*Weight 1**		CJ3M-CPU1[]: 140 g or less CJ3M-CPU3[]: 240 g or less
Current Consumption		CJ3M-CPU1[]: 5 VDC 0.26 A, 24 VDC 0.003 A CJ3M-CPU3[]: 5 VDC 0.91 A, 24 VDC 0.003 A
Use Environment	Ambient Operating Temperature	0 to 55°C
	Ambient Operating Humidity	10% to 90% (with no condensation)
	Atmosphere	Must be free from corrosive gases.
	Ambient Storage Temperature	-20 to 70°C
	Altitude	2,000 m or less
	Pollution Degree	2 or less: Conforms to IEC 61010-2-201.
	Noise Immunity	2 kV on power supply line (Conforms to IEC 61000-4-4.)
	Overvoltage Category	Category II: Conforms to IEC 61010-2-201.
	EMC Immunity Level	Zone B
	Vibration Resistance	Conforms to IEC60068-2-6. 5 to 8.4 Hz with 3.5-mm amplitude, 8.4 to 150 Hz Acceleration of 10 m/s² for 100 min in X, Y, and Z directions (10 sweeps of 10 min each = 100 min total)
	Shock Resistance	Conforms to IEC60068-2-27. 150 m/s², 3 times in X, Y, and Z directions (100 m/s² for Relay Output Units)
Battery	Life	5 years at 25°C
	Weight	Approx. 10 g
	Model	CJ1W-BAT01 (Sold separately)
Applicable Standards		EU, cULus, RCM, KC *2

*1. Includes the weights of the End Cover.
*2. Refer to the OMRON website (http://www.ia.omron.com/) or consult your OMRON representative for the most recent applicable standards for each model.

Performance Specifications

Items					CJ3M-CPU[][]
User Memory					CPU11/31: 5K steps CPU12/32: 10K steps CPU13/33: 20K steps CPU14/34: 50K steps CPU15/35: 100K steps
I/O Bits					5,120 bits
Processing Speed	*Overhead Processing Time 1**				Normal Mode:CPU3[]: 260 μs CPU1[]: 160 μs
	Execution Time				Basic Instructions: 0.04 μs min.; Special Instructions: 0.06 μs min.
	Interrupts	I/O Interrupts and External Interrupts			Interrupt task startup time: 31 μs Return times to cyclic tasks: 10 μs
		Scheduled Interrupts			Minimum time interval: 0.4 ms (set in 0.1 ms increments)
		Scheduled Interrupts			Interrupt task startup time: 30 μs Return time to cyclic task: 11 μs
Maximum Number of Connectable Units					Total per CPU Rack or Expansion Rack: 10 Units max.; Total per PLC: 80 Units max.
	Basic I/O Units				80 Units max. However, a maximum of two CJ1W-INT01 Interrupt Input Units can be mounted.
	Special I/O Units				Units for up to 96 unit numbers can be mounted. (Unit numbers run from 0 to 95. Units are allocated between 1 and 8 unit numbers.)
	CPU Bus Units				CPU1[]: 16 Units max. CPU3[]: 15 Units max.
	Pulse I/O Modules				2 max.
	Slots for which interrupts can be used				Slots 0 to 4 on CPU Rack
Maximum Number of Expansion Racks					7 max.
CIO Area	I/O Area				5,120 bits (320 words): Words CIO 0000 to CIO 0319
	Link Area				3,200 bits (200 words): Words CIO 1000 to CIO 1199
	CPU Bus Unit Area				6,400 bits (400 words): Words CIO 1500 to CIO 1899
	Special I/O Unit Area				15,360 bits (960 words): Words CIO 2000 to CIO 2959
	Pulse I/O Area				20 inputs, 12 outputs (CIO 2960 to CIO 2963)
	Serial PLC Link Area				1,440 bits (90 words): Words CIO 3100 to CIO 3189
	EtherCAT Remote Area				2,368 bits (148 words), 3,800 to 3863 words, 3,900 to 3,963 words, 3,980 to 3,999 words
	DeviceNet Area				9,600 bits (600 words): Words CIO 3200 to CIO 3799
Work Area	Internal I/O Area				3,200 bits (200 words): Words CIO 1300 to CIO 1499 (Cannot be used for external I/O.) 37,504 bits (2,344 words): Words CIO 4000 to CIO 6143 (Cannot be used for external I/O.)
Work Area	Work Area				8,192 bits (512 words): Words W000 to W511 (Cannot be used for external I/O.)
Holding Area					8,192 bits (512 words): Words H000 to H511 Bits in this area maintain their ON/OFF status when PLC is turned OFF or operating mode is changed. Words H512 to H1535: These words can be used only for function blocks. They can be used only for function block instances (i.e., they are allocated only for internal variables in function blocks).
Auxiliary Area					Read-only: 31,744 bits (1,984 words) • 7,168 bits (448 words): Words A0 to A447 • 24,576 bits (1,536 words): Words A10000 to A11535 2 Read/write: 16,384 bits (1,024 words) in words A448 to A1471 2
Temporary Area					16 bits: TR0 to TR15
Timer Area					4,096 timer numbers (T0000 to T4095)
Counter Area					4,096 counter numbers (C0000 to C4095)
DM Area					32k words *3 • DM Area words for Special I/O Units: D20000 to D29599 (100 words × 96 Units) • DM Area words for CPU Bus Units: D30000 to D31599 (100 words × 16 Units)
EM Area					32k words/bank × 1 to 10 banks max.: E00_00000 to E09_32767 max. *4
EM Area					CPU[]1/[]2/[]3: 1 bank CPU[]4/[]5: 10 banks
Index Registers					IR0 to IR15 These are special registers for storing PLC memory addresses for indirect addressing. (Index Registers can be set so that they are unique in each task or so that they are shared by all tasks.)
Cyclic Task Flag Area					128 flags
Memory Card					HMC-SD29[]: 2 GB HMC-SD49[]: 4 GB HMC-SD1A[]: 16 GB
Operating Modes					PROGRAM Mode: Programs are not executed. Preparations can be executed prior to program execution in this mode. MONITOR Mode: Programs are executed, and some operations, such as online editing, and changes to present values in I/O memory, are enabled in this mode. RUN Mode: Programs are executed. This is the normal operating mode.
Execution Mode					Normal Mode
Programming Languages					Ladder Logic (LD) Sequential Function Charts (SFC) Structured Text (ST) Instruction Lists (IL)
Function Blocks	Maximum number of definitions				2,048
Function Blocks	Maximum number of instances				2,048
FB Program Area					40K steps
Tasks	Type of Tasks				Cyclic tasks Interrupt tasks (Power OFF interrupt tasks, scheduled interrupt tasks, I/O interrupt tasks, external interrupt tasks, and input interrupt tasks (Pulse I/O Module) *3)
Tasks	Number of Tasks				Cyclic tasks: 128 Interrupt tasks: 256 (Interrupt tasks can be defined as cyclic tasks to create extra cyclic tasks. Therefore, the total number of cyclic tasks is actually 384 max.)
Symbols (Variables)	Type of Symbols				Local symbols: Can be used only within a single task in the PLC. Global symbols: Can be used in all tasks in the PLC. Network symbols (tags): I/O memory in the CPU Unit can be externally accessed using symbols, depending on parameter settings.
	Data Type of Symbols				BOOL (bit) UINT (one-word unsigned binary) UDINT (two-word unsigned binary) ULINT (four-word unsigned binary) INT (one-word signed binary) DINT (two-word signed binary) LINT (four-word signed binary) UINT BCD (one-word unsigned BCD) 5 UDINT BCD (two-word unsigned BCD) 5 ULINT BCD (four-word unsigned BCD) 5 REAL (two-word floating-point) LREAL (four-word floating-point) CHANNEL (word) NUMBER (constant or number) WORD (one-word hexadecimal) DWORD (two-word hexadecimal) LWORD (four-word hexadecimal) STRING (1 to 255 ASCII characters) TIMER (timer) 6 COUNTER (counter) *6 User-defined data types (data structures)
	Maximum Size of Symbol				32k words
	Array Symbols (Array Variables)				One-dimensional arrays
	Number of Array Elements				32,000 elements max.
	Number of Registrable Network Symbols (Tags)				10,000 max.
	Length of Network Symbol (Tag) Name				255 bytes max.
	Encoding of Network Symbols (Tags)				UTF-8
Data Tracing	Memory Capacity				220,000 words
	Memory Capacity				(Up to 32k words × the maximum bank number for the CPU Unit when EM is specified in CX-Programmer)
	Number of Samplings				Bits = 31, one-word data = 32, two-word data = 16, four-word data = 8
	Sampling Cycle				1 to 2,550 ms (Unit: 1 ms)
	Trigger Conditions				• Bit Upward/downward differentiation, ON, OFF AND/OR condition combinations for a maximum of 4 bits • Word =, >, ≥, <, ≤, ≠ AND/OR condition combinations for a maximum of 2 words • AND/OR condition combinations for bit conditions and word conditions
File Memory					Memory Card HMC-SD[][][] is used EM file memory (Part of the EM Area can be converted for use as file memory.)
Source/Comment Memory			Program source, comments, program index, and symbol table		Capacity: 2 Mbytes
Commu- nications	Logical Ports for Communications		Logical Ports		8 ports (Used for SEND, RECV, CMND, PMCR, TXDU, and RXDU instructions.)
	Logical Ports for Communications		Extended Logical Ports		64 ports (Used for SEND2, RECV2, CMND2, and PMCR2 instructions.)
	CIP Communications Specification		Class 3 (Number of Connections)		Number of connections: 128
	CIP Communications Specification		UCMM (Non- connection Type)		Maximum number of clients that can communicate at the same time: 32 Maximum number of servers that can communicate at the same time: 32
	Peripheral (USB) Port				USB 2.0-compliant Type-C connector
		Baud Rate			12 Mbps max.
	Serial Port				Interface: Conforms to EIA RS-232C.
		Communications Method			Half-duplex
		Synchronization Method			Start-stop
		Baud Rate			0.3, 0.6, 1.2, 2.4, 4.8, 9.6, 19.2, 38.4, 57.6, or 115.2 (kbps)
		Transmission Distance			15 m max.
	*EtherNet/IP Port 7**				---
		Trans- mission Specifi- cations	Media Access Method		CSMA/CD
			Modulation		Baseband
			Transmission Paths		Star
			Baud Rate		100 Mbps (100Base-TX)
			Transmission Media		Shielded twisted-pair (STP) cable; Categories: 5, 5e
			Transmission Distance		100 m (between Ethernet switch and node)
			Number of Cascade Connections		No restrictions if Ethernet switch is used.
		Commu- nications Specifi- cations	CIP Communications: Tag Data Links		---
				Number of Connections	256
				Packet Interval (Refresh period)	0.5 to 10,000 ms (Unit: 0.5 ms) Can be set for each connection. (Data will be refreshed at the set interval, regardless of the number of nodes.)
				Permissible Communications Band *8	12,000 packets per second
				Number of Registrable Tags	256
				Type of Tags	CIO, DM, EM, HR, WR, and network symbols
				Number of Tags per Connection	8 (Seven tags if PLC status is included in the segment.)
				Maximum Link Data Size per Node	184,832 words
				Maximum Data Size per Connection	252 or 722 words *9 (Data is synchronized within each connection.)
				Number of Registrable Tag Set	256 (1 connection = 1 segment)
				Maximum Tag Set Size	722 words (One word is used when PLC status is included in the segment.)
				Maximum Number of Tags Refreshable in a Single Cycle of CPU Unit *10	Output/send (CPU Unit to EtherNet/IP): 256 Input/receive (EtherNet/IP to CPU Unit): 256
				Data Size Refreshable in a Single Cycle of CPU Unit *10	Output/send (CPU to EtherNet/IP): 6,432 words Input/receive (EtherNet/IP to CPU): 6,432 words
				Change of Tag Data Link Parameter Settings during Operation	Supported *11
				Multi-cast Packet Filter *12	Supported
				Quick Connect	Originator only is supported
			CIP Communications: Explicit Messages		---
				Class 3 (Number of Connections)	Number of connections: 128
				UCMM (Non- connection Type)	Maximum number of clients that can communicate at the same time: 32 Maximum number of servers that can communicate at the same time: 32
				CIP Routing	Supported (CIP routing is enabled for the following remote Units: CJ1W-EIP21/EIP21S, CJ3M-CPU3[], CJ2H-CPU6[]- EIP, CJ2M-CPU3[], and CS1W-EIP21/EIP21S.)
			FINS Communications		---
				FINS/UDP	Supported
				FINS/TCP	16 connections max.
			Socket Service (TCP)		8 sockets max.
			Socket Service (UDP)		8 sockets max.
			Modbus TCP Server		8 connections max.
			Modbus UDP Server		Supported
			Modbus TCP Client		Possible by function block using Socket Service 8 connections max.
			Modbus UDP Client		Possible by function block using Socket Service 8 connections max.
			EtherNet/IP Conformance Test		Conforms to CT21.
			EtherNet/IP Interface		10Base-T/100Base-TX Auto Negotiation/Fixed Setting
Pulse I/O (When using Pulse I/O Module)	External interface				CJ2M-MD211 or CJ2M-MD212 Pulse I/O Module with 40-pin MIL connector
	Pulse Inputs				Can be used as normal inputs, interrupt inputs, quick- response inputs, or high-speed counter inputs. (Functions of each input must be selected in the PLC Setup.) Input method: Line-driver input or 24-VDC input (selected by wiring)
		Normal inputs			20 max. (10 per Pulse I/O Module) Input constants: Set in the PLC Setup (0, 0.5, 1, 2, 4, 8, 16, or 32 ms). Default: 8 ms
		Interrupt inputs and quick-response inputs			8 max. (4 per Pulse I/O Module) Input signal minimum ON pulse width: 30 μs
		High-speed counter inputs			4 max. (2 per Pulse I/O Module) Input method: Differential-phase (×4) pulses, pulse + direction, up/down pulses, or increment pulse Maximum response frequency: 50 kHz for differential phases or 100 kHz for single phase Counting mode: Linear mode or circular (ring) mode Count value: 32 bits Counter reset: Phase Z + software reset or software reset Control method: Target-value comparison or range comparison Gate function: Supported
	Pulse Outputs				Can be used as normal outputs, pulse outputs, or PWM outputs. (Functions of each output must be selected in the PLC Setup.) Output method: Sinking or sourcing transistor outputs (The method is determined by Pulse I/O Module model.)
		Normal outputs			12 max. (6 per Pulse I/O Module)
		Pulse outputs			4 max. (2 per Pulse I/O Module) Output method: CW/CCW or pulse + direction (The method is determined by the I/O wiring and the instructions used in the ladder program.) Output frequency: 1 pps to 100 kpps (in increments of 1 pps) Output Mode: Continuous mode (for speed control) or independent mode (for position control) Output pulses: Relative coordinates: 0000 0000 to 7FFF FFFF hex (0 to 2,147,483,647 pulses) Absolute coordinates: 8000 0000 to 7FFF FFFF hex (-2,147,483,648 to 2,147,483,647) Acceleration/deceleration curves: Linear or S-curve Origin search function: Supported
		PWM outputs			4 max. (2 per Pulse I/O Module) Output frequency: 0.1 to 6,553.5 Hz (in 0.1-Hz increments) or 1 to 32,800 Hz (in 1-Hz increments) Duty ratio: 0.0% to 100.0% (in 0.1% increments)

*1. The following times are added if EtherNet/IP data tag links are used.
CJ3M-CPU3[]: 100 μs + Number of transfer words × 0.78 μs
When the Pulse I/O Module is mounted, 10 μs × number of mounted units is added.
*2. A960 to A1471 and A10000 to A11535 cannot be accessed by CPU Bus Units, Special I/O Units, PTs, and Support Software that do not specifically support the CJ2/CJ3 CPU Units.
*3. Bits in the EM Area can be addressed either by bit or by word. These bits cannot be addressed by CPU Bus Units, Special I/O Units, PTs, and Support Software that do not specifically support the CJ3 CPU Units.
*4. Force-setting/resetting bits in the EM Area is possible either for banks that have been specified for automatic address allocation or for banks specified for the EM Area force-set/reset function.
*5. This data type cannot be used in Function blocks.
*6. This data type can be used only in Function blocks.
*7. The EtherNet/IP port is built into the CJ3M-CPU3[] only.
*8. “Packets per second” is the number of communications packets that can be processed per second.
*9. Large Forward Open (CIP optional specification) must be supported in order for 505 to 1,444 bytes to be used as the data size. Application is supported between CS/CJ-series PLCs. When connecting to devices from other manufacturers, make sure that the devices support the Large Forward Open specification.
*10. If the maximum number is exceeded, refreshing will require more than one CPU Unit cycle.
*11. When changing parameters, however, the EtherNet/IP port where the change is made will be restarted. In addition, a timeout will temporarily occur at the other node that was communicating with that port, and it will then recover automatically.
*12. The EtherNet/IP port supports an IGMP client, so unnecessary multicast packets are filtered by using an Ethernet switch that supports IGMP snooping.

Function Specifications

Functions				Description
Cycle Time Management	Minimum Cycle Time			A minimum cycle time can be set. (0.2 to 32,000 ms; Unit: 0.1 ms) The minimum cycle time setting can be changed in MONITOR mode
	Cycle Time Monitoring			The cycle time is monitored. (10 to 40,000 ms; Unit: 10 ms)
	Background Processing			Instructions with long execution times can be executed over multiple cycles to prevent fluctuations in the cycle time.
Unit (I/O) Management	Basic I/O Units, Special I/O Units, and CPU Bus Units	I/O Refreshing	Cyclic Refreshing	Cyclic refreshing of Basic I/O Units, Special I/O Units, and CPU Bus Units
			Immediate Refreshing	I/O refreshing by immediate refreshing instructions
			Refreshing by IORF	I/O refreshing by IORF instruction
		Unit Recognition at Startup		The number of units recognized when the power is turned ON is displayed.
	Basic I/O Units	Input Response Time Setting		The input response times can be set for Basic I/O Units. The response time can be increased to reduce the effects of chattering and noise at input contacts. The response time can be decreased to enable detecting shorter input pulses.
		Load OFF Function		All of the outputs on Basic I/O Units can be turned OFF when an error occurs in RUN or MONITOR mode.
		Basic I/O Unit Status Monitoring		Alarm information can be read from Basic I/O Units and the number of Units recognized can be read.
	Special I/O Units and CPU Bus Units	Reading/writing data using instructions for specific Units		Special instructions can be used to read/write required data for specific Units at high speed.
	Special I/O Units and CPU Bus Units	Unit Restart Bits to Restart Units		A Special I/O Unit or CPU Bus Unit can be restarted.
	Configuration Management	Automatic I/O Allocation at Startup		I/O words can be automatically allocated to the Basic I/O Units that are connected in the PLC to start operation automatically without registering Units into I/O tables.
		I/O Table Creation		The current unit configuration can be registered in I/O tables to prevent it from being changed, to reserve words, and to set words.
		Rack/Slot First Word Settings		The first words allocated to a Units on the Racks can be set.
Pulse I/O Functions (When using Pulse I/O Module)	Pulse Input Functions	Normal Inputs		Input signals are read during I/O refreshing and stored in I/O memory.
		Interrupt Inputs		An interrupt task can be started when an input signal turns ON or turns OFF.
		Quick-response Inputs		Input signals that are shorter than the cycle time are read and stored in I/O memory.
		High-speed Counter Inputs		High-speed pulse signals are counted. Interrupt tasks can also be started.
	Pulse Output Functions	Normal Outputs		The status of I/O memory is output during I/O refreshing.
		Pulse Outputs		A pulse signal is output with the specified frequency and number of pulses at a fixed duty ratio (50%).
		PWM Outputs		A pulse signal is output at the specified duty ratio.
	Origin Searches			The origin point of the machine is determined according to the specified origin search parameters while actually outputting pulses and using the origin and origin proximity input signals as conditions. (Pulse inputs and outputs are also used for this function.)
Memory Management	Holding I/O Memory when Changing Operating Modes			The status of I/O memory can be held when the operating mode is changed or power is turned ON. The forced-set/reset status can be held when the operating mode is changed or power is turned ON.
	File Memory			Files (such as program files, data files, and symbol table files) can be stored in Memory Card, EM File Memory, or Comment Memory.
	Built-in Flash Memory			The user program and Parameter Area can be backed up to an internal flash memory when they are transferred to the CPU Unit.
	EM File Function			Parts of the EM Area can be treated as file memory.
	Storing Comments			I/O comments can be stored as symbol table files in a Memory Card, EM file memory, or comment memory.
	EM Configuration			EM Area can be set as trace memory or EM file memory.
	Battery-free I/O Memory Backup Function			This function holds DM Area (D), EM Area (E), Holding Area (H), Counter (C), and Auxiliary Area (A) data without the need for a battery when the power is interrupted.
Memory Cards	Automatic File Transfer at Startup			A program file and parameter files can be read from a Memory Card when the power is turned ON.
	Program Replacement during PLC Operation			User programs can be transferred from a Memory Card to CPU Unit during operation.
	Function for Reading and Writing Data from a Memory Card			Data in I/O memory in the CPU Unit can be written to a Memory Card in CSV/TXT format. Data in CSV/TXT format in the Memory Card can be read to I/O memory in the CPU Unit.
Communications				---
	Peripheral (USB) Port			Bus for communications with various kinds of Support Software running on a personal computer.
	Serial Port			---
		Host Link (SYSWAY) Communications		Host Link commands or FINS commands placed between Host Link headers and terminators can be sent from a host computer or PT to read/write I/O memory, read/control the operating mode, and perform other operations for PLC.
		No-protocol Communications		I/O instructions for communications ports (such as TXD/RXD instructions) can be used for data transfer with peripheral devices such as bar code readers and printers.
		NT Link Communications		I/O memory in the PLC can be allocated and directly linked to various PT functions, including status control areas, status notification areas, touch switches, lamps, memory tables, and other objects.
		Peripheral Bus		Bus for communications with various kinds of Support Software running on a personal computer.
		Serial Gateway		This gateway enables receiving and automatically converting FINS to the CompoWay/F.
		Serial PLC Links		Data is exchanged between CPU Units using serial ports without communications programming. PTs set to the 1:N NT Link protocol can be included in the network.
	*EtherNet/IP Port 1**			100Base-TX/10Base-T Protocols: TCP/IP, UDP, ARP, ICMP (ping only), BOOTP, LLDP Applications: FINS, CIP, SNTP, DNS (Client), FTP (Server), Modbus (Server)
		CIP Commu- nications Service	Tag Data Links	Programless cyclic data exchanges with the devices on the EtherNet/IP network.
		CIP Commu- nications Service	Message Commu- nications	Any CIP commands can be received from the devices on the EtherNet/IP network.
		FINS Commu- nications Service	Message Commu- nications	Any FINS commands can be transferred with the devices on the EtherNet/IP network.
		Socket service	Message Commu- nications	Any data can be sent and received to and from general-purpose devices over Ethernet.
		Modbus Commu- nications Service	Message Commu- nications	Modbus commands can be sent and received to and from Modbus clients and Modbus servers on an EtherNet/IP network.
Interrupt	Scheduled Interrupts			A task is executed at a specified interval.
		Resetting and restarting with MSKS		When MSKS is executed, the internal timer is restarted and the time to first interrupt is set to a fixed value.
		Reading present value of internal timer with MSKR		MSKR can be used to read the time that has elapsed until the scheduled interrupt is started or since the previous scheduled interrupt.
	Power OFF Interrupts			A task can be executed when CPU Unit's power turns OFF.
	I/O Interrupts			A task can be executed when an input signal is input to an Interrupt Input Unit.
	External Interrupts			A task can be executed when interrupts are requested from a Special I/O Unit or a CPU Bus Unit.
	Input Interrupt Function of Pulse I/O Module			A task is started for an interrupt input from a Pulse I/O Module or for a high-speed counter input.
		Input Interrupts		Interrupt tasks are executed when the interrupt input turns ON or turns OFF. Direct Mode: An interrupt task is executed each time an input signal changes. Counter Mode: Changes in the input signal are counted up or down and the interrupt task is executed when the counter counts out. (The maximum response frequency is 3 kHz.)
		High-speed Counter Interrupts		An interrupt task is executed when preset comparison conditions for a high-speed counter are met. Target-value comparison: The interrupt task is executed when the count matches a specified value. Range comparison: The interrupt task is executed when the count enters or leaves a specified range of values.
Clock	Clock Function			Clock data is stored in memory. Accuracy (Accuracy depends on the temperature.) Ambient temperature of 55°C: -3.5 to 0.5 min error per month Ambient temperature of 25°C: -1.5 to 1.5 min error per month Ambient temperature of 0°C: -3 to 1 min error per month
	Built-in Capacitor Backup Time			At ambient temperature of 40°C: 10 days
	Operation Start Time Storage			The time when operating mode was last changed to RUN mode or MONITOR mode is stored.
	Operation Stop Time Storage			The last time a fatal error occurred or the last time the operating mode was changed to PROGRAM mode is stored.
	Startup Time Storage			The time when the power was turned ON is stored.
	Power Interruption Time Storage			The time when the power is turned OFF is stored.
	Total Power ON Time Calculation			The total time that the PLC has been ON is stored in increments of 10 hours.
	Power ON Clock Data Storage			A history of the times when the power was turned ON is stored.
	User Program Overwritten Time Storage			The time that the user program was last overwritten is stored.
	Parameter Date Storage			The time when the Parameter Area was overwritten is stored.
Power Supply Management	Memory Protection			Holding Area data, DM Area data, EM Area data, Counter Completion Flags, and counter present values are held even when power is turned OFF. CIO Area, Work Area, some Auxiliary Area data, and Timer Completion Flags, timer present values, index registers, and data registers can be protected by turning ON the IOM Hold Bit in the Auxiliary Area, and by also setting the IOM Hold Bit to “Hold” in the PLC Setup.
	Power OFF Detection Time Setting			The detection time for power interruptions can be set. AC power supply: 10 to 25 ms (variable) DC power supply: 2 to 5 ms (CJ1W-PD022) or 2 to 20 ms (CJ1W-PD025)
	Power OFF Detection Delay Time			The detection of power interruptions can be delayed: 0 to 10 ms (Not supported by the CJ1W-PD022.)
	Number of Power Interruptions Counter			The number of times power has been interrupted is counted.
Function Blocks				Standard programming can be encapsulated as function blocks.
	Languages in Function Block Definitions			Ladder programming or structured text
Debugging	Online Editing			The program can be changed during operation (in MONITOR or PROGRAM mode), except for block programming areas.
	Force-Set/Reset			Specified bits can be set or reset. A parameter can be set to enable force-setting/ resetting bits in EM Area banks. Force-setting/resetting is enabled for the specified bank and all the banks after it.
	Differentiate Monitoring			ON/OFF changes in specified bits can be monitored.
	Data Tracing			The specified I/O memory data can be stored in the trace memory in the CPU Unit. The triggers can be set.
		Continuous Tracing		The trace data can be uploaded during data tracing using the CX-Programmer. This enables continuously logging the data by constantly uploading the trace data.
		Automatically starting tracing when operation starts		Data tracing can be automatically started when operation is started (i.e., when the operating mode is changed from PROGRAM mode to MONITOR or RUN mode).
	Storing Location of Error when an Error Occurs			The location and task number where execution stopped for a program error is recorded.
	Program Check			The programs can be checked for items such as no END instruction and FALS/FAL errors at startup.
Self- diagnosis and Restoration	Error Log			A function is provided to store predefined error codes in CPU Unit, error information, and time at which the error occurred.
	CPU Error Detection			CPU Unit WDT errors are detected.
	User-defined Failure Diagnosis			Errors can be generated for user-specified conditions: Non-fatal errors (FAL) and fatal errors (FALS). Program section time diagnosis and program section logic diagnosis are supported (FPD instruction).
	Load OFF Function			This function turns OFF all outputs from Output Units when an error occurs.
	RUN Output			The RUN output from the CJ1W-PA205R turns ON while CPU Unit is in RUN mode or MONITOR mode.
	Basic I/O Load Short-circuit Detection			This function provides alarm information from Basic I/O Units that have load short-circuit protection.
	Failure Point Detection			The time and logic of an instruction block can be analyzes using the FPD instruction.
	CPU Standby Detection			This function indicates when the CPU Unit is on standby because all Special I/O Units and CPU Bus Units have not been recognized at the startup in RUN or MONITOR mode.
	Non-fatal Error Detection	System FAL Error Detection (User- defined non-fatal error)		This function generates a non-fatal (FAL) error when the user-defined conditions are met in program.
		Duplicated Refreshing Error Detection		This function detects an error when an immediate refreshing Instruction in an interrupt task is competing with I/O refreshing of a cyclic task.
		Basic I/O Unit Error Detection		This function detects the errors in Basic I/O Units.
		Backup Memory Error Detection		This function detects errors in the memory backup of the user programs and parameter area (backup memory).
		PLC Setup Error Detection		This function detects setting errors in the PLC Setup.
		CPU Bus Unit Error Detection		This function detects an error when there is an error in data exchange between the CPU Unit and a CPU Bus Unit.
		Special I/O Unit Error Detection		This function detects an error when there is an error in data exchange between the CPU Unit and a Special I/O Unit.
		Tag Memory Error Detection		This function detects errors in tag memory.
		Battery Error Detection		This function detects an error when a battery is not connected to the CPU Unit or when the battery voltage drops.
		CPU Bus Unit Setting Error Detection		This function detects an error when the model of a CPU Bus Unit in the registered I/O tables does not agree with the model that is actually mounted in the PLC.
		Special I/O Unit Setting Error Detection		This function detects an error when the model of a Special I/O Unit in the registered I/O tables does not agree with the model of Unit that is actually mounted.
	Fatal Error Detection	Memory Error Detection		This function detects errors that occur in memory of the CPU Unit.
		I/O Bus Error Detection		This function detects when an error occurs in data transfers between the Units mounted in Rack slots and the CPU Unit and detects when the End Cover is not connected to the CPU Rack or an Expansion Rack.
		Unit/Rack Number Duplication Error		This function detects an error when the same unit number is set for two or more Units, the same word is allocated to two or more Basic I/O Units, or the same rack number is set for two or more Racks.
		Too Many I/O Points Error Detection		This function detects an error when the total number of I/O points set in the I/O tables or the number of Units per Rack exceeds the specified range.
		I/O Setting Error Detection		The registered I/O tables are used to detect errors if the number of Units in the registered I/O tables does not agree with the actual number of Units that are connected or an Interrupt Unit has been connected in the wrong position.
		Program Error Detection		This function detects errors in programs.
			Instruction Processing Error Detection	This function detects an error when the given data value is invalid when executing an instruction, or execution of instruction between tasks was attempted.
			Indirect DM/EM BCD Error Detection	This function detects an error when an indirect DM/EM address in BCD mode is not BCD.
			Illegal Area Access Error Detection	This function detects an error when an attempt is made to access an illegal area with an instruction operand.
			No END Error Detection	This function detects an error when there is no END instruction at the end of the program.
			Task Error Detection	This function detects an error when there are no tasks that can be executed in a cycle, there is no program for a task, or the execution condition for an interrupt task was met but there is no interrupt task with the specified number.
			Differen- tiation Overflow Error Detection	This function detects an error when too many differentiated instructions are entered or deleted during online editing (131,072 times or more).
			Invalid Instruction Error Detection	This function detects an error when an attempt is made to execute an instruction that is not defined in the system.
			User Program Area Overflow Error Detection	This function detects an error when instruction data is stored after the last address in user program area.
		Cycle Time Exceeded Error Detection		This function monitors the cycle time (10 to 40,000 ms) and stops the operation when the set value is exceeded.
		System FALS Error Detection (User- defined Fatal Error)		This function generates a fatal (FALS) error when the user-defined conditions are met in program.
		Version Error Detection		This function detects an error when a user program includes a function that is not supported by the current unit version.
		Memory Card Transfer Error Detection		This function detects an error when the automatic file transfer from Memory Card fails at startup.
Maintenance	Simple Backup Function			This function collectively backs up the data in CPU Unit (user programs, parameters, and I/O memory) and internal backup data in the I/O Units.
	Unsolicited Communications			A function that allows the PLC to use Network Communications Instruction to send required FINS commands to a computer connected via a Host Link
	Remote Programming and Monitoring			Host Link communications can be used for remote programming and remote monitoring through a Controller Link, Ethernet, DeviceNet, or SYSMAC LINK Network. Communications across network layers can be performed. Controller Link or Ethernet: 8 layers DeviceNet or SYSMAC LINK: 3 layers
	Automatic Online Connection via Network		Direct Connection	This function enables automatically connecting to the PLC online when the CX-Programmer is directly connected by a serial connection (peripheral (USB) port or serial port).
	Automatic Online Connection via Network		Via Networks	This function enables connecting the CX-Programmer online to a PLC that is connected via an EtherNet/IP network.
Security	Read Protection using Password			This function protects reading and displaying programs and tasks using passwords. Write protection: Set using the DIP switch. Read protection: Set a password using the CX-Programmer.
	FINS Write Protection			This function prohibits writing by using FINS commands sent over the network.
	Unit Name Function			This function allows the users to give any names to the Units. Names are verified at online connection to prevent wrong connection
	Hardware ID Using Lot Numbers			This function sets operation protection by identifying hardware using the user programs according to lot numbers stored in the Auxiliary Area.
	Operation Log Function			Function for recording important operations and the results of operations performed by online users while they are online together with the date, IP address of PC, and user name.
	Extended FINS Write Access Log			Function for retaining a log of requests to write to the CPU Unit from external sources when the source address is not the local node.
	File Encryption Function			Function for encrypting files handled by CX-Programmer, backup tools, and file memory to prevent unauthorized access by third parties.
	*Secure Communications Function 2**			Function for ensuring the confidentiality and integrity of the line used to access important data on the CPU Unit from peripheral tools.
	*User authentication 2**			Function for allowing only specified users to perform online operation from peripheral tools to further restrict online operation based on privileges set for each user.
	*Port Open/Close Function 2**			Function for allowing you to block or allow communications to pass through the TCP/ UDP ports allocated to individual communication functions according to the configured setting.
	*IP Packet Filter 2**			Function for selectively allowing packets received by the EtherNet/IP port to pass through based on preset conditions.

*1. Supported only by CJ3M-CPU[].
*2. This function can be used only with CJ3M-CPU3[].

Specifications for Pulse I/O Functions

The following functions of CJ3M can be used by installing one or two Pulse I/O Modules. Each module has 10 high-speed inputs and 6 high-speed outputs.
• The inputs can be used as general-purpose inputs, interrupt inputs, quick-response inputs, high-speed counters, or origin search inputs.
• The outputs can be used as general-purpose outputs, pulse outputs, origin search outputs, or PWM outputs.

One Pulse I/O Module can be mounted

CJ3M-CPU3[] / -CPU1[] / CJ2M-MD21[] Specifications 8

Two Pulse I/O Modules can be mounted

CJ3M-CPU3[] / -CPU1[] / CJ2M-MD21[] Specifications 9

Note: The Pulse I/O Module closest to the CPU Unit is Pulse I/O Module 0 and the other one is Pulse I/O Module 1.

Performance Specifications

Item			Description
Pulse I/O	Model of Pulse I/O Modules		CJ2M-MD211 (Sinking-type) CJ2M-MD212 (Sourcing-type)
	External Interface		40-pin MIL connector
	Pulse Inputs		Can be used as normal inputs, interrupt inputs, quick-response inputs, or high-speed counter inputs. (Function of each input must be selected in the PLC Setup.) Input method: Line-driver input or 24-VDC input (selected by wiring)
		Normal Inputs	20 max. (10 per Pulse I/O Module) Input constants: Set in the PLC Setup (0, 0.5, 1, 2, 4, 8, 16, or 32 ms). Default: 8 ms
		Interrupt Inputs and Quick-response Inputs	8 max. (4 per Pulse I/O Module) Input signal minimum ON pulse width: 30 μs
		High-speed Counter Inputs	4 max. (2 per Pulse I/O Module) Input method: Differential-phase (×4) pulses, pulse + direction, up/down pulses, or increment pulse Maximum response frequency: 50 kHz for differential phases or 100 kHz for single phase Counting mode: Linear mode or circular (ring) mode Count value: 32 bits Counter reset: Phase Z + software reset or software reset Control method: Target-value comparison or range comparison Gate function: Supported
	Pulse Outputs		Can be used as normal outputs, pulse outputs, or PWM outputs. (Function of each output must be selected in the PLC Setup.) Output method: Sinking or sourcing transistor outputs (The method is determined by Pulse I/O Module model.)
		Normal Outputs	12 max. (6 per Pulse I/O Module)
		Pulse Outputs	4 max. (2 per Pulse I/O Module) Output method: CW/CCW or pulse + direction (The method is determined by the I/O wiring and the instructions used in the ladder program.) Output frequency: 1 pps to 100 kpps (in increments of 1 pps) Output Mode: Continuous mode (for speed control) or independent mode (for position control) Output pulses: Relative coordinates: 0000 0000 to 7FFF FFFF hex (0 to 2,147,483,647 pulses) Absolute coordinates: 8000 0000 to 7FFF FFFF hex (-2,147,483,648 to 2,147,483,647) Acceleration/deceleration curves: Linear or S-curve Origin search function: Supported
		PWM Outputs	4 max. (2 per Pulse I/O Module) Output frequency: 0.1 to 6,553.5 Hz (in 0.1-Hz increments) or 1 to 32,800 Hz (in 1-Hz increments) Duty ratio: 0.0% to 100.0% (in 0.1% increments)

Function Specifications

Functions				Description
Pulse I/O Functions	Pulse Input Functions		Normal Inputs	Input signals are read during I/O refreshing and stored in I/O memory.
			Interrupt Inputs	An interrupt task can be started when an input signal turns ON or turns OFF.
			Quick- response Inputs	Input signals that are shorter than the cycle time are read and stored in I/O memory.
			High-speed Counter Inputs	High-speed pulse signals are counted. Interrupt tasks can also be started.
	Pulse Output Functions		Normal Outputs	The status of I/O memory is output during I/O refreshing.
			Pulse Outputs	A pulse signal is output with the specified frequency and number of pulses at a fixed duty ratio (50%).
			PWM Outputs	A pulse signal is output at the specified duty ratio.
	Origin Searches			The origin point of the machine is determined according to the specified origin search parameters while actually outputting pulses and using the origin and origin proximity input signals as conditions. (Pulse inputs and outputs are also used for this function.)
Interrupt	Input Interrupt Function			A task is started for an interrupt input from a Pulse I/O Module or for a high-speed counter input.
		Input Interrupts		Interrupt tasks are executed when the interrupt input turns ON or turns OFF. Direct Mode: An interrupt task is executed each time an input signal changes. Counter Mode: Changes in the input signal are counted up or down and the interrupt task is executed when the counter counts out. (The maximum response frequency is 3 kHz.)
		High-speed Counter Interrupts		An interrupt task is executed when preset comparison conditions for a high-speed counter are met. Target-value comparison: The interrupt task is executed when the count matches a specified value. Range comparison: The interrupt task is executed when the count enters or leaves a specified range of values.

Specifications of Pulse Input Functions

Interrupt Inputs

Item	Direct Mode	Counter Mode
Number of interrupt inputs	Max. 8 inputs
Allocated bit	CIO 2960 and CIO 2962, bits 00 to 03
Interrupt detection method	ON-to-OFF or OFF-to-ON transitions
Interrupt task numbers	140 to 147 (fixed)
Counting method	---	Incrimenting or decrementing (Set with the MSKS(690) instruction.)
Counting range	---	0001 to FFFF hex (16 bits) (Set in A532 to A535 and A544 to A547.)
Response frequency	---	Single-phase: 3 kHz × 8 inputs
Storage locations for PVs for interrupt inputs in Counter Mode	---	A536 to A539 and A548 to A551

Quick-response inputs

Item	Specifications
Number of Quick-response inputs	Max. 8 inputs
Quick-response inputs	Signals that are shorter than the cycle time are latched for one PLC cycle, so they can be detected in the PLC program. Minimum detectable pulse width is 30 μs.

High-speed Counter Inputs

Item		Description
Number of High-speed Counter Inputs		Max. 4 inputs
Pulse input method (counting mode)		Incremental pulse inputs	Differential phase input (4×)	Up/down inputs	Pulse + direction inputs
Input signals		Increment pulse	Phase A	Up pulse	Pulse
		---	Phase B	Down pulse	Direction
		---	Phase Z	Reset	Reset
Frequency and number of high-speed counters		100 kHz, 2 inputs × 2 I/O Modules	50 kHz, 2 inputs × 2 I/O Modules	100 kHz, 2 inputs × 2 I/O Modules	100 kHz, 2 inputs × 2 I/O Modules
Counting mode		Linear mode or ring mode
Count value		Linear mode: 8000 0000 to 7FFF FFFF hex 0000 0000 to FFFF FFFF hex (for increment pulse) Ring mode: 0000 0000 to Max. ring value
High-speed counter PV storage locations		High-speed counter 0: A271 (upper 4 digits) and A270 (lower 4 digits) High-speed counter 1: A273 (upper 4 digits) and A272 (lower 4 digits) High-speed counter 2: A317 (upper 4 digits) and A316 (lower 4 digits) High-speed counter 3: A319 (upper 4 digits) and A318 (lower 4 digits) Refreshed during overseeing processing. Use PRV(881) to read the most recent PVs.
High-speed counter PV storage locations		Data format: 8 digit hexadecimal • Linear mode: 8000 0000 to 7FFF FFFF hex 0000 0000 to FFFF FFFF hex (for increment pulse) • Ring mode: 0000 0000 to Max. ring value
Control method	Target value comparison	Up to 48 target values and corresponding interrupt task numbers can be registered.
Control method	Range Comparison	Up to 8 or up to 32 ranges can be registered, with a separate upper limit, lower limit, and interrupt task number for each range.
Counter reset method		• Phase-Z + Software reset The counter is reset when the phase-Z input goes ON while the Reset Bit (A531.00 to A531.03) is ON. • Software reset The counter is reset when the Reset Bit (A531.00 to A531.03) is turned ON. Operation can be set to stop or continue the comparison operation when the high-speed counter is reset.

Specifications of Pulse Output Functions

Position Control and Speed Control

Item	Specifications
Number of Pulse Outputs	Max. 4 outputs (Pulse Output 00 to 03)
Output mode	Continuous mode (for speed control) or independent mode (for position control)
Positioning (independent mode) instructions	PULS (886) and SPED (885), PULS (886) and ACC (888), or PULS2 (887) instruction
Speed control (continuous mode) instructions	SPED (885) and ACC (888) instructions
Origin (origin search and origin return) instructions	ORG (889) instruction
Interrupt feeding instruction	IFEED (892) instruction
Output frequency	1 pps to 100 kpps (1 pps units), two pulse outputs × 2 Pulse I/O Modules
Frequency acceleration and deceleration rates	Set in increments of 1 pps for acceleration/deceleration rates from 1 to 65,535 pps (every 4 ms). The acceleration and deceleration rates can be set independently only with the PLS2 (887) instruction.
Changing SVs during instruction execution	The target frequency, acceleration/deceleration rate, and target position can be changed.
Pulse output method	CW/CCW or pulse + direction
Number of output pulses	Relative coordinates: 0000 0000 to 7FFF FFFF hex (Accelerating or decelerating in either direction: 2,147,483,647) Absolute coordinates: 8000 0000 to 7FFF FFFF hex (-2,147,483,648 to 2,147,483,647)
Relative/absolute coordinate specifications for pulse output PVs	Absolute coordinates are specified automatically when the origin location has been defined by changing the pulse output PV with the INI (880) instruction or performing an origin search with the ORG(889) instruction. Relative coordinates must be used when the origin is undefined.
Relative pulse/absolute pulse specifications	The pulse type can be specified with an operand in the PULS (886) or PLS2 (887) instruction. Absolute pulses can be used when absolute coordinates are specified for the pulse output PV, i.e. the origin location has been defined. Absolute pulse cannot be used when relative coordinates are specified, i.e., when the origin location is undefined. An instruction error will occur.
Pulse output PV's storage location	The following Auxiliary Area words contain the pulse output PVs Pulse output 0: A277 (leftmost 4 digits) and A276 (rightmost 4 digits) Pulse output 1: A279 (leftmost 4 digits) and A278 (rightmost 4 digits) Pulse output 2: A323 (leftmost 4 digits) and A322 (rightmost 4 digits) Pulse output 3: A325 (leftmost 4 digits) and A324 (rightmost 4 digits) The PVs are refreshed during regular I/O refreshing.

Variable-duty Pulse Outputs (PWM)

Item	Specifications
Number of PWM Outputs	Max. 4 outputs (PWM Output 00 to 03)
Duty ratio	0.0% to 100.0% in 0.1% increments
Frequency	0.1 Hz to 6,553.5 Hz (Set in 0.1-Hz increments.) 1 Hz to 32,800 Hz (Set in 1-Hz increments.)
Output mode	Continuous Mode
Instruction	PWM (891) instruction

last update: October 1, 2026

Product Category

Automation Systems
- Programmable Controllers
  - CJ3
    - CPU Units
      - CJ3M-CPU3[] / -CPU1[] / CJ2M-MD21[]

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