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EtherNet/IP Unit and Built-in EtherNet/IP Port Specifications Section 2-1
CJ-series EtherNet/IP Unit
Note If tag data links are being used, use 100Base-TX. Otherwise, 10Base-T can
be used, but this is not recommended.
Item Specifications
Model number CJ1W-EIP21
Type 100Base-TX (See note.)
Applicable PLCs CJ-series PLCs
Unit classification CJ-series CPU Bus Unit
Mounting location CPU Rack or Expansion Rack
Number of Units that can be
mounted
8 max. (including Expansion Racks)
Note Up to seven EtherNet/IP Units can be connected to a CJ2H-CPU@@-EIP CPU
Unit. Up to two EtherNet/IP Units can be connected to a CJ2M CPU Unit.
CPU Unit
words used
Allocated CIO Area
words (CPU Bus
Unit words)
25 words/Unit (one unit number’s words)
These words contain control bits and flags, the target node PLC’s operating and error
information, Unit status, communications status, registered/normal target node infor-
mation, and FINS/TCP connection status.
Allocated DM Area
words (CPU Bus
Unit words)
100 words/Unit (one unit number’s words)
These words contain the IP address display/setting area.
User-set area Any usable data area words
Target node PLC’s operating and error information, and registered/normal target
node information
CPU Bus Unit Sys-
tem Setup
Not used.
Non-volatile memory within Ether-
Net/IP Unit (See note.)
The following settings are stored in the EtherNet/IP Unit’s non-volatile memory.
Note Unlike the regular Ethernet Units, the CPU Bus Unit Setup Area in the CPU
Unit is not used for these settings.
1. Unit Setup (communications settings for the EtherNet/IP Unit, such as the IP ad-
dress, DNS server settings, host name, baud rate, FINS/UDP settings, and FINS/
TCP settings)
2. Tag data link settings (device parameters)
Transfer
specifica-
tions
Media access
method
CSMA/CD
Modulation method Baseband
Transmission paths Star form
Baud rate 100 Mbit/s (100Base-TX)
Transmission media Shielded twisted-pair (STP) cable
Categories: 100 Ω at 5, 5e
Transmission dis-
tance
100 m (distance between hub and node)
Number of cascade
connections
There is no limitation when a switching hub is used.
Current consumption (Unit) 410 mA max. at 5 V DC
Weight 94 g max.
Dimensions 31 × 90 × 65 mm (W × H × D)
Other general specifications Other specifications conform to the general specifications of the CJ-series.