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Old December 28th, 2013, 03:56 PM   #1
Coelho
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Consume a V20 controller tag on a V17 controller

I have a tag being produced by a 1769-L16 controller (firmware 20.13) and am trying to consume it on a 1756-L62 controller (firmware 17.8). The problem is I'm unable to add the 1769 controller module to the tree in the 1756 controller project. The only available 1769 modules are L32's. Updating the firmware is not an option. Is it possible to consume this tag or will I need to use a message instruction?
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Old December 28th, 2013, 05:57 PM   #2
Ken Roach
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Create the 1769 interface and controller as though it was a 1769-L32E. The newer CompactLogix will behave just like the older one.

Produced/Consumed Tags never check the controller type or revision. They only check the Slot Number, the data type, and the tag name.
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Old December 28th, 2013, 07:47 PM   #3
robertmee
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What Ken said...I just did this exact scenario on a large startup about a month ago, with an even more complex setup...The v20 processor was a safety processor L72 w/ safety partner, while the V17 processor was a standard L61. All I had to do in the v17 processor was tell it the consumer was an L62 non-safety and worked like a champ. DO NOT ever try to configure the consumer as a safety PLC in the other PLC even though it is one, as it will completely lock up the safety partner as it's trying to be controlled by two different programs. Learned that one the hard way, and it's going to end up as an AB tech note as it took me and AB tech support working together to sort that one out.
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