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Standby IO Server Offline with no Hardware Alarm

Jim

Hello All,

Working with primary and secondary Modbus IO Servers in CitectSCADA 8.10 Update 12. With everything hooked up and online I can see the primary server comms in an ethernet traffic monitor and I can also see the 30 second WatchDog traffic to the Standby IO server. I can disconnect the primary and see the swap over to the standby and then re-establish primary comms and it will swap back.

The problem comes in when I disconnect the standby IO server. I wait for a few minutes but I do not get any hardware alarms. I can see the error using the kernel General window. It shows the channel going off line but no hardware alarms.

Do you know if there is anything I can check? I know this used to be an issue back in version 5 but supposedly it has been fixed.

Thank you for any help and have a great day,

Jim Spence

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  • I'm not sure if there's supposed to be a hardware alarm for missing standby connections, but you could create an advanced alarm with an expression like this:

    IODeviceInfo("PLC1,S", 3) = "16"

    16 is the value for 'offline', and is returned as a string. For more state values like 'online', 'starting', 'stopping', etc., please consult Citect help on the IODeviceInfo function. 

    Also, make sure to add ,S to your I/O Device name so the standby I/O device will be checked instead of the primary one.

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  • I'm not sure if there's supposed to be a hardware alarm for missing standby connections, but you could create an advanced alarm with an expression like this:

    IODeviceInfo("PLC1,S", 3) = "16"

    16 is the value for 'offline', and is returned as a string. For more state values like 'online', 'starting', 'stopping', etc., please consult Citect help on the IODeviceInfo function. 

    Also, make sure to add ,S to your I/O Device name so the standby I/O device will be checked instead of the primary one.

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