With the DirectLogic PLCs I could set the unit ID with dip switches on the ECOM module or set it using NetEdit 3. Where can I set the unit ID on Productivity PACs?
Don't know if it applies to your Directlogic. Might want to check.
Do you get any errors in the gateway logs for that modbus device? I know I’ve had issues before trying to read across unmapped modbus addresses where the simplest fix was to just map the gaps.
That typically happens when there’s no traffic to a device within the device’s timeout. Apparently, a fair number of Modbus devices will time out the TCP channel in ten idle seconds. You might need at least one tag on a five-second scan class to keep the connection alive.