Omron NX Series User Manual

10-1
Overview of the CIP Message Com-
munications Service
10-1-1
Overview of the CIP Message Communications Service
CIP commands can be sent to devices on the EtherNet/IP network whenever they are required.
You execute CIP_SEND instructions in a program in the NJ/NX-series CPU Unit to send CIP com-
mands, such as those to read and write data and to receive the responses.
You can use CIP messages from the client to read and write memory in the Controller with the server
without adding any special programming to the user program of the Controller with the server.
EtherNet/IP
EtherNet/IP
port
CIP response
CIP command
or host computer
EtherNet/IP
port
NJ/NX-series
Controller
NJ/NX-series
Controller
10-1-2
Message Communications Service Specifications
Item Specification
Message type Either of the following can be selected.
CIP UCMM connectionless messages
CIP class 3 connection messages
Execution method CIPSend (Send Explicit Message Class 3) instruction or CI-
PUCMMSend (Send Explicit Message UCMM) instruction
Data contents Sending required CIP commands and receiving responses
Communications parameters Message type, timeout value, and route path specification
Maximum length per
connection
Non-connection type
(UCMM)
502 bytes
Connection type
(class 3)
• Using Forward_Open
502 bytes
• Using Large_Forward_Open
8,192 bytes
10 CIP Message Communications
10-2
NX-series EtherNet/IP Unit User's Manual (W627)

Omron NX Series Specifications

General

Brand	Omron
Model	NX Series
Category	Controller
Language	English