Possible to read four encoders on PCI-6601 at the same time?

[Border_Collie]

Hello

I have a problem (newby I think)I need some help with.

For a encoder test procedure, I must read the Positions of four linear encoders with an external trigger provided by a additional encoder. The procedure will run for a specified length, and the important data for me is the difference in position between the first encoder, who acts as an master, and the other three encoders. the fith encoder provides a synchronisation signal for additional measurements.

I defined four global channels the Measurement Explorer, one for each counter. First I tried to combine these channels in the DAQ-Designer, but got an error that the reulting DAQmx-Task is unable to read multple counters, and I should try multichannel DAQmx read instead. After opening the Frontpanel of the faulty Express-VI, I found the problem. The DAQ-Designer included a DAQmx read (Counter DBL 1Chan 1 Sampl).vi in the structure.

I tried to find a DAQmx read (Counter DBL NChan 1 Sampl).vi, but without sucess. Is it not possible to read multple counter with a DAQmx-Task, or am I missing something?

My equipment ist:

Labview 7.0 Full development system
NI PCI-6035E (for additional measurements)
NI PCI-6601 (for counter measurements)

signed Markus Bomke

[Sebastian N]

Dear Markus,

it is no problem to use more than one counter with the DAQmx driver.
I write a little example, which use two counters from my MIO board a count the digital edges.
Use and develop this example for your work.

Hope this example help that you can read the more than one Counter.

I which you a nice year,

best regards.

SebastianN
NI Germnay

[Sebastian N]

I have create the VI with LV 7.1 here the vi IN lv 7.0.