How many counters can I use simultaneously?

[Qia.sky]

I have cDAQ-9172 and 9411.

From the specification of 9411, there are 6DI channels of 9411.

The NI-DAQmx help say

Note  PFI terminals are available when the device is installed in slot 5 or slot 6 of an NI cDAQ-9172 chassis.

So, I don't know whether that means 9172 has 2 counters can be used simultaneously.

My question is 9411 has 6DI channels, it can be used as counters simultaneously?

I have more 2 device generate frequency which need to be acquired.

I hope someone here can help me or give me some hint.

QIA

[KyleBryson · Accepted solution]

Hi QIA,

The cDAQ-9172 has 2 counters that can be used simultaneously, and you're correct that installing your NI 9411 in slot 5 or slot 6 will allow you to access those counters.  Any of the 6 DI lines on your 9411 can be used to access the inputs to either counter.

I'm not sure if you're saying that you have more than 2 signals to measure frequency on. If that's the case, post a little more info about your application (How often do you need to read the frequency?  How many channels?) and we can try to figure out a good solution.

Regards,
Kyle