8-2
CIP Message Communications Client
Function
8-2-1
Overview
The NJ/NX-series CPU Units can send a CIP message to an external device to request a service by
specifying an internal object of the device which supports CIP message communications server func-
tionality.
This is called the CIP message communications client function.
The NJ/NX-series CPU Units execute CIP communications instructions in the user program and send
CIP messages. With those CIP messages, you can read and write variables of an NJ/NX-series CPU
Unit on the EtherNet/IP network.
EtherNet/IP
Specify the CIP communications parameters,
such as the route path, as well as the servi
ce
code, the request path, and the service data.
NJ/NX-series
CPU Unit
NJ/NX-series
CPU Unit
Built-in EtherNet/IP port
CIP_SEND
Specify a variable name.
Built-in EtherNet/IP port
CIP communications instruction
8-2-2
CIP Communications Instructions
The following CIP communications instructions are available.
For details on CIP communications instructions, refer to the NJ/NX-series Instructions Reference
Manual (Cat. No. W502).
Instruc-
tions
Name Description
Communica-
tions method
CIPUCMM-
Read
Read Variable
UCMM Explicit
Reads the value of a variable with a Network Publish at-
tribute from the specified remote Controller on the CIP
network and stores the value in a variable at the local
Controller
.
CIP UCMM
connectionless
message
CIPUCMM-
W
rite
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.
CIPUCMM-
Send
Send Explicit Mes-
sage UCMM
Sends a specified CIP command to the specified remote
Controller on the CIP network.
Refer to 8-2-10 Response Codes on page 8-35
and
8-5 CIP Object Services on page 8-47 for information
on the service codes and response codes that are used
with the NJ/NX-series CPU Units.
8 CIP Message Communications
8-4
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
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