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PSDIRECT driver for CitectSCADA
14
Setting Up Heartbeat monitoring
The S7 driver continues polling normally when the PLC is in Stop mode resulting in frozen
values on the screen. To force #COM’s when the PLC is in stop mode requires configuration
of the Heartbeat monitoring feature..
For each IO device (Unit) configured, a parameter of the following form is entered into the
Citect.INI file
HeartBeatAddress_<devname>=<address>
Where <devname> is the name of the IO device in CitectSCADA and in the backend driver
And <address> is a PLC address of a variable that MUST change very 5 seconds at least if
the PLC is running. A simple way of achieving this is to increment an integer in OB1 of the
PLC scan cycle. ** the address format here is the same as the OPC server so you specify W
for Integer & D for longs etc.
Examples
HeartBeatAddress_S7PLC=MW0
HeartBeatAddress_PumpHouse=DB100,W44
HeartBeatAddress_Furnace2=DB130,D44 (long integer)
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