Using Cip Message Communications; Overview; Cip Communications Instructions - Omron CJ1W-EIP21 Operation Manuals

8-2

Using CIP Message Communications

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Overview

CIP communications instructions can be executed in the user program in the NJ-series CPU Unit to
read and write variables in a NJ-series CPU Unit or a CJ2 CPU Unit on the EtherNet/IP network, and
send specified CIP commands.
CIP_SEND
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CIP Communications Instructions

The following CIP communications instructions are available. For details on CIP communications
instructions, refer to the NJ-series Instructions Reference Manual (Cat. No. W502).
Instruction Name
Read Variable
CIPUCMMRead UCMM Explicit
Write Variable
CIPUCMMWrite UCMM Explicit
Send Explicit
Message
CIPUCMMSend UCMM
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
NJ-series
EtherNet/IP Unit
CPU Unit
Specify the CIP communications parameters,
such as the route path, as well as the service
code, the request path, and the service data.
Description
Reads the value of a variable with a Network Publish attribute from
the specified remote Controller on the CIP network and stores the
value in a variable at the local Controller.
Writes the value of a variable at the local controller to a variable
with a Network Publish attribute at the specified remote Controller
on the CIP network.
Sends a specified CIP command to the specified remote Controller
on the CIP network.
Refer to 8-2-9 Response Codes and 8-3 CIP Objects Sent to the
EtherNet/IP Unit for information on the service codes and response
codes that are used with the NJ-series CPU Units.
8 Message Communications
NJ-series
CPU Unit
CIP command
EtherNet/IP
EtherNet/IP Unit
Specify a variable name.
Communica-
tions method
CIP UCMM
connectionless
messages
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