9401 counters

[cfin]

I'm  using the 9172 and I have a question about the 9401 module.  I have an encoder (which requires a counter) and a Devantech SRF05 sonar (which requires a counter output and an input).  Can I use the 2 counters on the 9401 and a digital output signal?    

[cfin]

Also, can I use one counter with alternating directions?  i.e. send out a counter pulse, then receive one, continuously.

[cfin]

Also, can I use one counter with alternating directions?  i.e. send out a counter pulse, then receive one, continuously.

[Mr.F]

Hello,

Yes, you can use both counters on the 9172 with the 9401 module. Can you clarify what you mean by using a counter with alternating direction? Do you need to measure the input pulse? Count them? Trigger an output?

[cfin]

I've changed the setup but am still having problems.  I have 2x 9401 cards in slots 5 and 6.  I have a sonar using the 2 counters (input and output) in slot 5 and the encoder  using an output counter in slot 6.

Separately they work, all together it does not.  B.T.W., this is in signalexpress.  

Thanks.

[Mr.F]

I’m sorry but that really didn’t clarify what you are trying to do. Can you post your code? That might clarify what you are trying to do.

[Seth_B. · Accepted solution]

Hello cfin,

The cDAQ-9172 chassis has only two counters total.  The counters are on the chassis, not the 9401 modules.  As a result, you can only have two single counter tasks or one two-counter task running at the same time.

As a result, if your sonar is using one counter for input and one for output, you won't be able to use counters anywhere else in the chassis.

The cDAQ-9174, 9178, and 9188 all have four counters on-board and would likely be more suited to your application.  These counters may be accessed from any slot.

Regards,

[cfin]

Thanks.