topic Re: 9401 counters in Counter/Timer

9401 counters

cfin — Fri, 01 Oct 2010 14:57:00 GMT

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?

Re: 9401 counters

cfin — Fri, 01 Oct 2010 15:33:40 GMT

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

Re: 9401 counters

cfin — Fri, 01 Oct 2010 15:33:42 GMT

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

Re: 9401 counters

Mr.F — Tue, 05 Oct 2010 14:06:10 GMT

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?

Re: 9401 counters

cfin — Wed, 06 Oct 2010 18:17:46 GMT

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.

Re: 9401 counters

Mr.F — Thu, 07 Oct 2010 13:49:51 GMT

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.

Re: 9401 counters

Seth_B. — Tue, 11 Feb 2025 15:18:08 GMT

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,

Re: 9401 counters

cfin — Thu, 07 Oct 2010 19:41:16 GMT

Thanks.