I am trying to read and write specific parameters from a Powerflex 525 to a Micrologix 1100. I followed the instructions from a Knowledgebase and was able to do it. By using a CIP Generic - Generic Get Attribute Single MSG I can read parameter 7 for instance without any trouble. I tried to change the instance in the MSG to read another parameter (388 to be exact). It did not work. The MSG sent back an error:
error code (in upper byte of MGx:y.22) was returned by Comms module or CIP device
I switched it back to 7 and it was fine. I was told by the Knowledgebase that the "instance" was the same as the parameter. I thought that changing the instance from 7 to 388 would read the value of 388 instead. Am I doing something wrong? Are there certain parameters that you can't read? Is there something else that I need to change?