8-3
8 Message Communications
NJ-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
8-2 Using CIP Message Communications
8
8-2-1 Overview
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
Built-in EtherNet/IP Port for information on the service codes and
response codes that are used with the NJ-series CPU Units.
EtherNet/IP
NJ-series
CPU Unit
Built-in EtherNet/IP port
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
Built-in EtherNet/IP port
Specify a variable name.
CIP_SEND
CIP command
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