I’m having an issue reading tag values from a CompactLogix using v20 firmware. I can connect to the PLC fine and read all the tag structures. The diagnostics show a connection. Everything looks good, except I cannot read any values form any of the tags.
When I try to read a value from the OPC Quick Client I get the following:
Quality: [Bad_CommunicationError] A low level communication error occurred.
Any help would be appreciated.