Count True BOOL in Array, M340 PLC, with Unity Pro.

gripster said:

Been a while since I did ST in M340's but are you not trying to compare a Boolean with an array of INTs? + it will keep counting as true if this is the case on every scan as you have loaded the Alarm Triggers as true (for test purposes?)
above the Loop.

Each Scan will see
AlarmTrigger[73] := true;
AlarmTrigger[74] := true;
AlarmTrigger[75] := true;
Then execute the loop

I think........

Click to expand...

Nablar said:

I am trying to make a function that count the number of True BOOL inn a specific Array and return the count to an INT AlarmArrayActiveAlarms.
I have tried the following, but the INT AlarmArrayActiveAlarms just keeps counting forever if one BOOL is True.

Any ideas what I am doing wrong? in this case i would expect the INT to return 3.


I am using a Modicon M340 PLC, with Unity Pro.

Code:

AlarmTrigger: ARRAY[0..200] OF BOOL
AlarmArrayCounter :INT
AlarmArrayActiveAlarms: INT

AlarmTrigger[73] := true;
AlarmTrigger[74] := true;
AlarmTrigger[75] := true;


FOR AlarmArrayCounter:=0 TO 200 DO

    IF AlarmTrigger[AlarmArrayCounter] = True THEN 
        AlarmArrayActiveAlarms := AlarmArrayActiveAlarms + 1;
    END_IF;

END_FOR;

Click to expand...

Lare said:

AlarmArrayActiveAlarmsCnt:=0

FOR AlarmArrayCounter:=0 TO 200 DO

IF
AlarmTrigger[AlarmArrayCounter] = True THEN AlarmArrayActiveAlarms_cnt :=AlarmArrayActiveAlarmsCnt+1;
END_IF;

END_FOR;

AlarmArrayActiveAlarms :=AlarmArrayActiveAlarmsCnt;

Click to expand...

daba said:

Don't think you need the IF....THEN...END_IF construct, just add the binary 0 or 1 of the triggers to the counter....

AlarmArrayActiveAlarmsCnt:=0

FOR AlarmArrayCounter:=0 TO 200 DO
AlarmArrayActiveAlarms_cnt := AlarmArrayActiveAlarmsCnt + AlarmTrigger[AlarmArrayCounter];
END_FOR;

AlarmArrayActiveAlarms := AlarmArrayActiveAlarmsCnt

Click to expand...