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My company is in the process of migrating or replacing an old PLC/DCS system. One of the frustrating features of the current system is the resolution of alarm time-stamping is effectively limited by the approx 1s update rates of the PLC statuses into the DCS. This makes analysis of cause and effect more difficult because we have to take into account the delays between events and the alarm being registered.
We are not after substation style SOE reporting, just something that is a bit closer to the scan time of the PLCs.
Is anyone aware of PLC systems that support time-stamped report-by-exeception style communications or a more sophisticated producer-consumer model? While this is obviously more complex it seems like a much better approach to event recording that the poll-as-fast-as-you-can approach.
I thought AB/Rockwell did something like producer-consumer to get timely event transfer between the PLC and HMI (ControlNet and Ethernet/IP protocols). Are there other examples in leading PLC systems? Thanks.
We are not after substation style SOE reporting, just something that is a bit closer to the scan time of the PLCs.
Is anyone aware of PLC systems that support time-stamped report-by-exeception style communications or a more sophisticated producer-consumer model? While this is obviously more complex it seems like a much better approach to event recording that the poll-as-fast-as-you-can approach.
I thought AB/Rockwell did something like producer-consumer to get timely event transfer between the PLC and HMI (ControlNet and Ethernet/IP protocols). Are there other examples in leading PLC systems? Thanks.