Communication error & Loss between modules and transmitters

Hello Experts,

We have been notified that acommunication error and loss on Delta V System S-Serie between modules and transmitters. (final element)  This problem was noted after a blackout (Power loss) on the plateform.

I need your advise/ support to troubleshoot this issues, it is judged a very critical situation.

Thanks

2 Replies

  • hi
    Printscreens are not very clear to highlight the fault, but I can suggest you to check if every device is powered back ( switches)
    May be after a power shutdown and up you have one or more breaker down or power supplies out of service
  • The Alarm list indicates Module Error alarms, which given the loss of communication to the multiple CIOC's, are likely due to Bad IO status. With ACN Communications: Not (communicating?) on multiple CIOC's, it would seem you've lost a part of your DeltaV network.

    The first thing to understand in troubleshooting the network is your network topology. Since you are seeing Module alarm errors from the controller, and loss of connection to the IO cards, it would appear your network interruption is between the controller and its CIOC's. Since the controller appears to still be communicating, it is unlikely that all CIOC's suffered catastrophic loss of communication all at the same time. So we likely have a network switch issue. Typically DeltaV has a redundant network, meaning you have lost both primary and secondary connections.

    Sometimes we find redundant devices are powered by the same power distribution, which could explain simultaneous loss of primary and secondary networks. Or sometimes we have an existing issue that has not been repaired and a second fault occurs on the other network. Hard to say.

    Looking at all the CIOC's that have lost communication, where are they connected. Determine what common hardware or network cable that these all use on both the Primary and secondary networks. You should review the DeltaV Event Chronicle (PHV EVENTS) to see if the loss of communication was preceded by loss of primary and or secondary networks. You want to determine if both networks were affected at once or if one network was off line due to a separate incident. Was total loss due to a single event or was it due to two separate unrelated events. If it was due to a single event, that narrows the possible failure conditions to common causes. Like power or human error.

    Once you know the network components involved, confirm that they are workings: Switches are powered up and communicating. If you have Network command console, check to see if switches are reporting, or go check them in their cabinets. Use DeltaV Diagnostics to confirm which devices are not communicating. Start with the switches and the nearest CIOC to determine where the communications have been disrupted.

    Andre Dicaire