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The 504 and 505s are both discontinued as of 3/31/2024, I would start looking at other paths for migration. Depending on the complexity of your machine, you could probably go to a CompactLogix based system for similar costs to just a processor. If you are going to keep the SLC based system, I would go ...

You may want to check Rockwell Automation Publication 440R-UM011B Minotaur Safety Relay (MSR) to Guardmaster Safety Relay (GSR) Conversion. It provides wiring examples of the discontinued Minotaur Safety Relays and provides the migration path to the Guardmaster Safety Relay. Not really an answer to your ...