How can I detect that I have lost communication to an extension rack on a M580 remote drop?

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Issue

Extension rack health on remote drop

Product Line

Modicon M580

Environment

EcoStruxure Control Expert

Resolution

You can detect the health of the extension rack by looking at the Device DDT for the CRA. You will find the IO_HEALTH_RACK_1. Each bit of the word corresponds to the slots in the rack. If you lose communication to the whole rack the value will be zero.

Data Editor