I have a continuous emission monitoring system that performs a 2 step communication process for data acquisition.
The computer talks to the compact logix plc. There is communication monitoring setup for this step.
The Compactlogix PLC speaks to a MIR9000 via a Prosoft MCM module via serial modbus communication. This link has failed and stopped updating the data to the PLC several times. No error is generated by the system.
I need to setup ladder logic to output an alarm function when this link fails. I was not the person that setup the original PLC ladder logic and documentation on it is limited.
I have located a COP command with the appropriate Dest (MCM1.slaveStatus.P2.SlaveStatus[MCM1.BP.Blockindex] that according to page 81 of the manual should read the slave status.
Logic is also in the PLC to enable and disable slave polling.
There is no logic to generate an alarm on repeated comm fails.
How would I add this to the PLC?
