Conversion from PLC-3 to ControlLogix

khurley1001 · Oct 5, 2006

I am converting from a PLC-3 to ControlLogix and our existing program uses Status bits (S0:2/13) to alarm a Rack Fault (RIO). I need to replicate this in the ControlLogix (using 1756-DHRIO to 1771 IO). Information on the AB website is as follows:
"There are no bits in a ControlLogix system that are the same as the fault bits in a PLC-5."

Does anyone have a good solution for this?

Thanks in advance.

jstolaruk · Oct 5, 2006

It will take a little effort and reading on your part but everything you need should be in this document, chapters 8,9,10, and 11 to translate the old status definitions in to the new ones.

http://literature.rockwellautomation.com/idc/groups/literature/documents/um/1756-um514_-en-p.pdf

Jim Wilks · Oct 5, 2006

Kevin:

Check out the RackStatus words created for each ASB module. There's lot's of rack status info there.

Jim

khurley1001 · Oct 5, 2006

Jim,

The AB technote says:
"The RackStatus member of the input tag is a diagnostic tag for the whole adapter - 0 if the data is good, non-zero if the data is bad."

Currently I am using R23:I.RackStatus NEQ 0, but I was not sure if there were any scenarios where this would not provide an alarm.

K

Jim Wilks · Oct 5, 2006

Kevin:

I believe that's the right answer. The true test is to try it!

Jim

Conversion from PLC-3 to ControlLogix

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