adding multi counters

[srd]

we have 7 boreholes which all go to counters to count how much they use daily. they now have a restiction on the amount of water they can take between any of the boreholes operating. is there a way of adding each of the counters so that when a limit is reached the pumps stop working until a next day reset. also the do not run all 7 boreholes all the time some basically we need to add up all the counters in operation on that day until they reach a set limit.

[Guenter]

Hi srd ,

the solution depends on the  programming language you use.

I think you use for counting the  C-FB's. At these the RE input can be used for a reset of the counter.
The Counters have also a QV output.

In ST you can summerize it easily  like:

MD1 := C01QV + C02QV + C03QV + C04QV + C05QV + C06QV + C07QV;


And then compare it with an IF clause:

IF MD1 >= 1000 THEN
   ;
END_IF;


In other programming languages you have to use multiple AR-FB's  to summarize and the A-FB to compare.


Günter