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Issues running more than 4 counters !

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Hello all

 

In my application i need to measure 6 signals simultenasly (pulse width measurment).

i have two 6363 boards , each has 4 counters. i used 4 counters from board A and another 2 from board B.

 

i created six independently loops, each runs a counter task, and i created enable\disable button for each loop
so i can test things out.

 

to simplify things out, i connected a 16 hz square signal to counter 1 only.

 

now, when i run the program with 4 counters enabled (this can be any combination of counters, for example two counters from board A and two counters from board B)   -   all works fine:
loop 1 runs 16 times per sec, as expected, and the other loops wait because nothing is connected to the counter inputs.

 

when i enable more than 4 counters (5 or 6 ), loop1 slows its iteration rate dramatically to 1 or 2 times per sec.

 

can you help me figure out this behaviour? (VI Attached)

 

thanks.

guy

 


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