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CJ1W-EIP21S

CJ-series EtherNet/IP Unit

CJ1W-EIP21S

EtherNet/IP unit with tag data link capacity of 180,000 words or more

Item list of CJ1W-EIP21S

Related Contents

last update: April 1, 2025

EtherNet/IP Units Specifications

Item Specifications
Model number CJ1W-EIP21S
Type 100Base-TX *1
Applicable PLCs NJ-series, CJ (CJ1, CJ2) series, and CP1H *2
Unit classification CJ-series CPU Bus Unit
Mounting location CPU Rack or Expansion Rack
Number of Units that can be
mounted *2		 NJ-series System: 4 max. (including Expansion Racks)
CJ series System: 8 max. (including Expansion Racks) *3
CP1H System: 2 max.
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 information, 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
System Setup		 Not used.
Non-volatile memory within
EtherNet/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 address, DNS server settings, host
name, baud rate, FINS/UDP settings, and FINS/TCP settings)
2. Tag data link settings (device parameters)
3. User authentication settings
4. Operation log
Transfer
specifi-
cations		 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
distance		 100 m (distance between hub and node)
Number of cascade
connections		 There is no limitation when a switching hub is used.
Current consumption (Unit) 650 mA max. at 5 V DC
Weight 91 g max.
Dimensions 31 × 90 × 65 mm (W × H × D)
Other general specifications Other specifications conform to the general specifications of the CJ-series.

*1. If tag data links are being used, use 100Base-TX. Otherwise, 10Base-T can be used, but this is not recommended.
*2. For the CJ1W-EIP21S, the following CPU Units are supported.
NJ[]01-[][][][], CJ2H-CPU[][], CJ2H-CPU[][]-EIP, CJ2M-CPU[][], CJ1G-CPU4[]P, CP1H-X40D[]-[], CP1H-XA40D[]-[], CP1H-Y20DT-D EtherNet/IP Unit with unit version 1.0 or later (Lot number 241001[] or later) is required to connect CJ1W-EIP21S to NJ-series CPU Unit. Use NJ-series CPU Unit with version 1.67 or later and Sysmac Studio with version 1.60 or later.
*3. Up to seven EtherNet/IP Units can be connected to a CJ2H-CPU6[]-EIP. Up to two EtherNet/IP Units can be connected to a CJ2M CPU Unit.

Communications Specifications

Item Specifications
NJ CJ2 CJ1
CIP
service		 Tag data
links
(Cyclic
communi-
cations)		 Number of connections 256
Packet interval
(refresh cycle)		 0.5 to 10,000 ms (in 0.5-ms units)
Can be set independently for each connection.
(Data is refreshed over the network at the preset interval and
does not depend on the number of nodes.)
Allowed
communications
bandwidth per Unit		 6,000 to 12,000 pps *1
Number of tag sets 256
Tag types CIO Area, DM Area, EM Area, Holding Area, Work Area,
and network symbols *2
Number of tags per
connection (= 1 tag set)		 8 (7 tags when the tag set contains the controller status)
Maximum link data size
per node
(total size of all tags)		 184,832 words
Maximum data size per
connection		 504 bytes (252 words) or 1444 bytes (722 words) *3
Data synchronicity is maintained within each connection.
Number of registrable
tag sets		 256 (1 connection = 1 tag set)
Maximum size of 1 tag
set		 722 words
(The controller status uses 1 word when the tag set contains the
PLC status.)
Maximum number of tags
that can be refreshed
per CPU Unit cycle *5		 Output/Transmission
(CPU to EtherNet/IP0)
: 256
Input/Reception
(EtherNet/IP to CPU)
: 256		 Output/Transmission
(CPU to EtherNet/IP): 19
Input/Reception
(EtherNet/IP to CPU): 20 *5
Data that can be
refreshed per CPU Unit
cycle *5
The layout of the
allocated CIO Area
words is the
defauly. *7		 Output/Transmission
(CPU to EtherNet/IP):
6,432 words
Input/Reception
(EtherNet/IP to CPU):
6,432 words		 Output/Transmission
(CPU to EtherNet/IP): 7,469 words
Input/Reception
(EtherNet/IP to CPU): 7,469 words
Changing tag data link
parameters during
operation		 Supported *7
Multicast packet filter
function *9		 Supported
Explicit
messaging		 Class 3 (connected) Number of connections: 128
UCMM (unconnected) Number of clients that can communicate at one time: 32 max.
Number of servers that can communicate at one time: 32 max.
CIP routing *10 Supported
CJ1W-EIP21/EIP21S, CS1W-EIP21/EIP21S,
NJ-501-[][][][], NJ-301-[][][][],
CJ2H-CPU[][]-EIP, CJ2M-CPU3[]
FINS service *11 FINS/UDP Not supported Supported
FINS/TCP Not supported 16 connections max.
SNMP Agent SNMPv1, SNMPv2c, SNMP trap
MIB MIB-II
EtherNet/IP conformance test CT17
Ethernet interface 10BASE-T or 100BASE-TX
Auto Negotiation or fixed settings

*1. In this case, pps means "packets per second" and indicates the number of packets that can be processed in one second.
*2. Network symbols can be used for the following CPU Units.
NJ501-[][][][]/NJ301-[][][][]/CJ2H-CPU6[]-EIP/CJ2M-CPU3[]/CJ2H-CPU6[] withe unit version 1.6 or later/CJ2M-CPU1[] with unit version 2.2 or later *3. To use 505 to 1,444 bytes as the data size, the system must support the Large Forward Open standard (an optional CIP specification). The CS/CJ-series Units support this standard, but before connecting to nodes of other companies, confirm that those devices also support it.
*4. If the maximum data size is exceeded, the data refreshing with the CPU Unit will extend over two or more cycles.
*5. If status layout is set to user settings, the maximum number of tags is as follows.

Output/Transmission Input/ Reception
18 18

*6. The table below shows value when the layout type is User defined.

When connected to CJ1 CPU Unit When connected to CJ2 CPU Unit
Data (words) that
can be refleshed per
CPU Unit cycle		 Output/Transmission 7321 6172
Input/Reception 7385 6236

*7. If parameters are changed in the EtherNet/IP Unit, however, the EtherNet/IP Unit will be restarted. When other nodes are communicating with the affected node, the communications will temporarily time out and automatically recover later.
*8. Because the EtherNet/IP Unit is equipped with an IGMP client, unnecessary multicast packets can be filtered by using a switching hub that supports IGMP snooping.
*9. EtherNet/IP Unit with unit version 1.0 or later (Lot number 241001[] or later) is required to connect CJ1W-EIP21S to NJ-series CPU Unit.
Use NJ-series CPU Unit with version 1.67 or later and Sysmac Studio with version 1.60 or later.
*10. The EtherNet/IP Unit uses the TCP/UDP port numbers shown in the following table.

Service Protocol Port number Remarks
CJ1/CJ2 NJ CJ1/CJ2 NJ CJ1/CJ2 NJ
Tag data links UDP 2222 The port number is fixed.
Class3, UCMM TCP/UDP 44818
DNS UDP 53
BOOTP client --- UDP --- 68
Secure Comm TCP --- 443 --- The port number is fixed.
FINS/UDP service UDP --- 9600 --- Port numbers in the
Unit Setup can be
changed with the
CX-Programmer		 Port numbers in the
Unit Setup can be
changed with the
Sysmac Studio.
FINS/TCP service TCP --- 9600 ---
FTP TCP 20, 21
SNTP UDP 123
SNMP UDP 161
SNMP trap UDP 162

Unit Versions and Software Versions

The following versions of the Sysmac Studio, CX-Programmer and Network Configurator are required to set EtherNet/IP Units.
Yes:Supported, ---:Not supported

CJ1W-EIP21S Sysmac Studio *1 CX-Programmer *2 Network Configurator for
EtherNet/IP		 EIP21S User
Management Tool
Ver.1.59 or
lower		 Ver.1.60 or
higher		 Ver.9.80 or
lower		 Ver.9.81 or
higher		 Ver.3.72 or
lower		 Ver.3.74a or
higher		 Ver.1.00 or higher
Ver.1.0 --- Yes *3 --- Yes --- Yes Yes

*1. Available only when connecting with NJ-series CPU Units.<br>
*2. Available only when connecting with CJ1/CJ2-series CPU Units.<br>
*3. Supported by unit version 1.0 or later (Lot number 241001[] or later).

Network Configurator Requirements

The Network Configurator is a software package designed for building, setting, and controlling a multi-vendor EtherNet/IP Network using OMRON's EtherNet/IP. It is included in CX-One version 3.0. The Network Configurator provides the following functions for building, setting, and controlling EtherNet/IP.

Item Specification
System Requirements Refer to the CX-One Catalog (Cat. No. R134), visit your local OMRON website.
Network
connection
method		 CS1/CJ1 CJ2 NJ
Serial interface CPU Unit's Peripheral or
RS-232C port		 CPU Unit's USB or RS-232C port CPU Unit's USB port
Ethernet
interface		 EtherNet/IP Unit's
Ethernet port		 CPU Unit’s Ethernet port
EtherNet/IP Unit’s Ethernet port
Location on Network A single node address is used (only when directly connected to EtherNet/IP).
Number of Units that can be
connected to Network		 A single Network Configurator per Network
(More than one Configurator cannot be used in the same system.)
Main
functions		 Network control
functions		 • The Network configuration can be created and edited regardless of
whether the Network Configurator is online or offline.
• The Network configuration can be read from a file or the network.
Configuration
functions		 The EDS files used by the Network Configurator can be installed and deleted.
Supported file formats Configurator network configuration files (*.ncf)
Configuration files (*.ncf) created using the Network Configurator for
EtherNet/IP (version 2) can be imported by
selecting External Data - Import from the File Menu.

last update: April 1, 2025

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