Omron SYSMAC CJ1W-EIP21, Operation Manuals

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8-3
8 Message Communications
CJ-series EtherNet/IP Units Operation Manual for NJ-series CPU Unit (W495)
8-2 Using
CIP Messa
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8-2 Using CIP Message Communications
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.
The following CIP communications instructions are available. For details on CIP communications
instructions, refer to the NJ-series Instructions Reference Manual (Cat. No. W502).
8-2-1 Overview
8-2-2 CIP Communications Instructions
Instruction Name Description
Communica-
tions method
CIPUCMMRead
Read Variable
UCMM Explicit 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. CIP UCMM
connectionless
messages
CIPUCMMWrite
Write Variable
UCMM Explicit 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.
CIPUCMMSend
Send Explicit
Message
UCMM 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.
NJ-series
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.
NJ-series
CPU Unit
EtherNet/IP Unit
Specify a variable name.
EtherNet/IP
CIP_SEND
EtherNet/IP Unit
CIP command