Cip Communication Server Function; Cip Message Structure For Accessing Cip Objects - Omron NJ Series User Manual

8-3

CIP Communication Server Function

The CIP Communication Server function is exclusively available for the NJ/NX-series Controllers.
This function executes services for a specified self-contained object in the CPU Unit after receiving the
CIP messages from external devices.
This section provides information on CIP messages structure along with information about how to use
CIP messages in a program that runs on a computer or by other means and uses the CIP Communi-
cation Server function to perform the following: -Writing CIP objects and the values of variables to the
NJ/NX-series Controller, -Reading CIP objects and the values of variables from the NJ/NX-series Con-
troller.
To read and write CIP objects or the values of variables between NJ/NX-series Controllers, use the
CIP communications instructions.
Refer to 8-2 CIP Message Communications Client Function on page 8-4 for information on how to use
CIP communications instructions for CIP message communications.
The variable to access
is specified in the
request path of the
CIP object or the
explicit message
to read or write data.
NJ/NX-series Controller
Variable
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CIP Message Structure for Accessing CIP Objects

This section shows how to specify messages to access CIP objects.
The CIP objects to be accessed are expressed by connecting the segments
defined in the CIP Common Specifications in the request path field in a CIP explicit message.
Example: Performing the Reset service (0x05) to the Instance (01 hex) of the Identity object (class: 01
hex)
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
Request
Response
The writing results of the
specified CIP object or
variable, or the value that was
read from the specified CIP
object or variable are stored
in the response.
You can read and write variables with
CIP communications instructions.
8 CIP Message Communications
Computer
NJ/NX-series Controller
Variable
8
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