Machine Expert M251 Read VAR Block with Serial Line Slave

xcyong89

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Join Date
Oct 2019
Location
Kuala Lumpur
Posts
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Hi, I am trying to use READ VAR function block in Modicon M251 to read data from 1 unit of Modbus RTU slave. However the READ VAR return error code below:

Comm Error Code: 16#FF
Operation Error Code: 16#0C

Could anyone have the experience to solve the problem? It will be nice if you could share the sample program for testing purpose.

Thank you
 

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