Which server am I connected to?

Hi Michael,

The concept of primary and standby is different for every Citect process (Alarm Server, Trend Server, Report Server and I/O Servers).
A client could be connected to the primary trend server as well as the standby alarm server. For I/O it's even more complicated because there is no primary or standby server as such. Each I/O device can have a primary and a standby definition, and these can reside on any I/O server in your setup.

If you want to know what I/O server your client is talking to for a specific I/O device, you can use the following function:

sCurrentIOServer = IODeviceInfo(sIODevice, 17); // returns the name of the active I/O server

This syntax only works if your primary and standby I/O devices are configured with the exact same name.
If the names of a redundant I/O device pair are not the same, you first have to find out the I/O device number (aka unit number) before you can find the active server:

iUnitNr = StrToInt(IODeviceInfo(sIODevice, 11)); // returns the I/O device number
sCurrentIOServer = IODeviceInfo(iUnitNr, 17); // returns the name of the active I/O server

To find out which Alarm server you are connected to use:

bConnectedToStandbyServer = StrToInt(ServerInfo("Alarm", 2); // returns 0 if connected to primary server, otherwise 1

This works for Trend and Report servers as well, just replace the word "Alarm" with "Trend" or "Report".

Hi Michael,

The concept of primary and standby is different for every Citect process (Alarm Server, Trend Server, Report Server and I/O Servers).
A client could be connected to the primary trend server as well as the standby alarm server. For I/O it's even more complicated because there is no primary or standby server as such. Each I/O device can have a primary and a standby definition, and these can reside on any I/O server in your setup.

If you want to know what I/O server your client is talking to for a specific I/O device, you can use the following function:

sCurrentIOServer = IODeviceInfo(sIODevice, 17); // returns the name of the active I/O server

This syntax only works if your primary and standby I/O devices are configured with the exact same name.
If the names of a redundant I/O device pair are not the same, you first have to find out the I/O device number (aka unit number) before you can find the active server:

iUnitNr = StrToInt(IODeviceInfo(sIODevice, 11)); // returns the I/O device number
sCurrentIOServer = IODeviceInfo(iUnitNr, 17); // returns the name of the active I/O server

To find out which Alarm server you are connected to use:

bConnectedToStandbyServer = StrToInt(ServerInfo("Alarm", 2); // returns 0 if connected to primary server, otherwise 1

This works for Trend and Report servers as well, just replace the word "Alarm" with "Trend" or "Report".