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How can I get the status of both redundant IO Serves on the graphics screen during runtime in Vijeo Citect SCADA.

You can use the inbuilt function of Vijeo Citect "ServerInfoEx" to display the status of the IO Servers . Also refer this below cicode for this functionality :

FUNCTION active_ioserver_detection_v2() 
STRING sLocalServerName 
sLocalServerName = ServerInfoEx ( "Server" , 0 , "IOServer" , "my_cluster" )
IF(IODeviceInfo("mydev" , 17) = sLocalServerName) THEN 
Message("Server Information", "This is the active IO server", 64);
//Place your code here 

Note : Kindly call this function from a button as this will use a blocking function.

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