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CJ CIP UCMM messaging

Written by Arlo D'Cruz

Updated at October 17th, 2024

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Introduction

The CJ2 CPU supports CIP messaging via built in Ethernet/IP port or CJ1W-EIP21(S). However it can be complicated generating the message structure to send the messages as desired. This article give a brief summary of how to use custom CIP messaging function blocks. Note that these blocks have not undergone the same validation as the built in functions in cx-programmer. 

CJ_EIP01_UCMM_Set

This function block sends an information write command in an explicit message (Set Attribute Single, Service Code: 10 hex).

 
 

CJ_EIP02_UCMM_Get

Sends an information read command in an explicit message (Get Attribute Single, Service Code: 0E hex).

 
 

CJ_EIP03_UCMM_Cmnd

Sends an explicit message with the defined service code.

 
 

Below is an example program showing how you may use the function blocks to read a attribute from a MX2 EIP card, write an attribute to a MX2 EIP card and use a command to read memory from a CJ controller (service code 1D). 

Example Program and FB files

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