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Checking online/offline status of client process on redundant server pair

Ashley

Hi,

Using Citect 2016 (update 24) I have a redundant server pair and am starting the same Cicode task at startup on the client process of both servers. The task function sits in a WHILE (1) DO loop forever with a delay between executions.

There is a count increment in the task which I only want to be performed by ONE server if both are online.

If the task ran on an alarm, trend, IO or report server, I could use ServerIsOnline() to check the status of each server pair (primary and standby), but I can't find the equivalent to this for the client process.

Any suggestions on how best to do this?

Thanks

Ash

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  • On the Client you could use IODeviceInfo("MyIODev",17) to find out which I/O server is the active server for a particular I/O Device and only count when the right server is active.
    To make this work, you need to define a redundant I/O device and make sure the I/O device name (and number) is equal for both servers.
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  • On the Client you could use IODeviceInfo("MyIODev",17) to find out which I/O server is the active server for a particular I/O Device and only count when the right server is active.
    To make this work, you need to define a redundant I/O device and make sure the I/O device name (and number) is equal for both servers.
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