Compactlogix MSG read PLC5 via ethernet. Can't cache connection?

hardaysknight

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Dec 2015
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Yesterday I was working with an Allen-Bradley Controllogix and a Compactlogix. I was using a MSG instruction to read from the Controllogix via ethernet, and I was given the option for the MSG configuration to cache the connection, so I did.


However, I'm using a similar setup on a different machine to read from a PLC5 to a Compactlogix via ethernet, but I do not have the option to cache the connection (it's greyed out). Does anyone know why?
 

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