Industrial Automation

CJ1W-ECT21

CJ-series EtherCAT® Slave Unit

CJ1W-ECT21

Hi-speed I/O link based on EtherCAT

last update: May 19, 2022

General Specification

The general specifications conform to those of the CJ-series PLCs, CP-series PLCs and NSJ-series PLCs *1.
*1. NSJ-series is no longer available to order.

Specifications

EtherCAT Slave Unit CJ1W-ECT21

Item		Specification
Model number		CJ1W-ECT21
Applicable PLCs		NJ-series, CJ-series, CP-series, NSJ-series *1
Unit classification		CPU Bus Unit
Applicable unit numbers		0 to F
Mounting position		CPU Rack or Expansion Rack
Number of Units that can be mounted		16 Units max. (you must allocate unique words)
CPU Unit words used	Allocated CIO Area words (CPU Bus Unit words) *2	25 words/Unit (one unit number’s words)
	Allocated CIO Area words (CPU Bus Unit words) *2	Unit Status 1, Unit Status 2, Slave Status 1, Slave Status 2
	Allocated DM Area words (CPU Bus Unit words) *3	100 words/Unit (one unit number’s words)
	Allocated DM Area words (CPU Bus Unit words) *3	I/O Communication Area Setting Table, I/O Communication Area Reference Table
	*Other I/O memory 4**	I/O communication area in any area *5
	CPU Bus Unit setting area	Not used
Transmission specifications	Communications protocol	EtherCAT protocol
	Modulation	Baseband
	Baud rate	100 Mbps
	Physical layer	100BASE-TX (IEEE 802.3)
	Topology	Depends on the specifications of the EtherCAT master
	Transmission media	Category 5 or higher twisted-pair cable (Recommended cable: double-shielded cable with aluminum tape and braiding)
	Transmission distance	Distance between nodes: 100 m or less
	Send/receive PDO data sizes	Allocatable IN and OUT data area sizes of 0, 50, 100, 200 or 400 bytes
	Mailbox data size	Input: 512 bytes Output: 512 bytes
	Mailbox	Emergency messages and SDO requests
	Refreshing methods	Free-Run Mode
	Node address setting range	1 to 255 (hardware switch setting) 1 to 65535 (software switch setting)
Current consumption		340 mA max. at 5 V DC
Weight		97 g max.
Dimensions		31 × 90 × 65 mm (W × H × D)

*1. NSJ-series is no longer available to order.
*2. Access via the device variables for CJ-series Unit when using NJ-serires CPU Units.
*3. Using the user-defined variable for R/W to the allocation area when using NJ-serires CPU Units.
*4. The IN and OUT data exchanged with the EtherCAT master is designated to memory areas by configuring the I/O
Communication Area Setting Table. Refer to “CJ-series EtherCAT Slave Units Operation Manual” for NJ-series CPU Unit
(W542)
*5. Set with allocated DM area words (CPU Bus Unit words) or CX-Programmer when using CJ/CP/NSJ-series CPU Units.

EtherCAT Communications Specifications

Item	Specification
Communications standard	IEC 61158 Type 12
Physical layer	100BASE-TX (IEEE 802.3)
Modulation	Baseband
Baud rate	100 Mbps
Topology	Depends on the specifications of the EtherCAT master.
Transmission media	Category 5 or higher twisted-pair cable (Recommended cable: double-shielded cable with aluminum tape and braiding)
Transmission distance	Distance between nodes: 100 m or less

Unit Versions and Software Versions

Model mumber of EtherCAT Slave Unit	Unit version	Corresponding unit version/version *
		Using NJ CPU Unit		Using CJ/CP/NSJ-series CPU Unit
		Unit version of CPU Units	Sysmac Studio Version	Unit version of CPU Units	CX-Programmer version
CJ1W-ECT21	Ver.1.0	Ver.1.10 or later	Ver.1.13 or higher	The oldest available version or later	Ver.9.54 or higher

* Some Units do not have all of the versions given in the above table. If a Unit does not have the specified version, support is provided by the oldest available version after the specified version. Refer to the user’fs manuals for the specific Units for the relation between models and versions.

last update: May 19, 2022

Product Category

Automation Systems
- Programmable Controllers
  - CJ1
    - CPU Bus Units
      - CJ1W-ECT21
      - CJ1W-NC[]81 / []82
      - CJ1W-SPU01-V2
      - CJ1W-NC[]71
      - CJ1W-SCU
      - CJ1W-CLK
      - CJ1W-FLN22
      - CJ1W-DRM21
      - CJ1W-EIP21S
      - CJ1W-PNT21
      - CJ1W-PRM21
      - CJ1W-PRT21

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