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CJ1W-ECT21

CJ-series EtherCAT® Slave Unit

CJ1W-ECT21

Hi-speed I/O link based on EtherCAT

General Specification

The general specifications conform to those of the CJ-series PLCs, CP-series PLCs and NSJ-series PLCs.

Specifications

EtherCAT Slave Unit CJ1W-ECT21

Item Specification
Model number CJ1W-ECT21
Applicable PLCs NJ-series, CJ-series, CP-series, NSJ-series
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) *1
25 words/Unit (one unit number’s words)
Unit Status 1, Unit Status 2, Slave Status 1, Slave Status 2
Allocated DM Area words
(CPU Bus Unit words) *2
100 words/Unit (one unit number’s words)
I/O Communication Area Setting Table, I/O Communication Area Reference Table
Other I/O memory *3 I/O communication area in any area *4
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. Access via the device variables for CJ-series Unit when using NJ-serires CPU Units.
*2. Using the user-defined variable for R/W to the allocation area when using NJ-serires CPU Units.
*3. 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)
*4. 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.