Applies To:
  • CitectSCADA 1.00, 1.01, 1.10, 1.11, 1.20, 2.00, 2.01
Summary:
Question: I would like operators logged into one area of the plant able to see if alarms are active in other areas. I would like this information to be displayed on every page of my project. How can I do this without logging into the other areas of the plant? 

Solution:
You can use the function AlarmFirstCatRec() to find alarms in any area. This function can only be called on the alarm server, so if you want the result on a Citect Client send the output to a Disk PLC. For example:

FUNCTION
CheckAlarms()
   INT nRec;
   WHILE TRUE DO
      nRec = AlarmFirstCatRec(0, 1, 20);
      IF nRec = -1 THEN
         IF AlarmArea20 <> 0 THEN
            AlarmArea20 = 0;
         END
      ELSE
         IF AlarmArea20 <> 1 THEN
            AlarmArea20 = 1;
         END
      END
      Sleep(10);
      ReRead(0);
   END
END

This function uses AlarmFirstCatRec to check for any unacknowledged alarms in area 20. If any alarms are found, then the disk PLC variable AlarmArea20 is set to 1, otherwise it is 0. The variable is only written to if it needs to be changed - this saves unnecessary writes to the disk PLC. The function then sleeps for 10 seconds to stop excessive use of CPU. The Citect clients can then display the value of AlarmArea20 to show if alarms exist in this area. You should add extra disk PLC variables as required for each area of your plant. 
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