digital output to control three motors

[iganghel]

Dear all,

I'm a newcomer in the field of controlling devices. I have the following problem. I try to control 3 units using a NI USB 6215. So I connect 3 leds to line 0, 1, 2 and I adapt a Labview example to my case. The problem is that only the first case (I mean case of first led) is working correctly. I select Motor_1, I gave the command and the led is ON for the indicated period of time and OFF at the end of that period. When I try to do the same thing with the led number 2, I select the Motor_2,  I gave command, the led number 2 is ON for the indicate period of time, OFF at the end of that period, but in the same time is starting the led number 1 and is ON all the time ( it should be OFF). However in case of the led number 3, when I gave command the sequence is correctly executet for the indicated period of time, but in the same time, both led 1 and led 2 start and are ON all the time. At the end of this post, I would like to thank to Altenbach the Knight of NI for posting a veriy nice example (Volume Dispensiion in 2008).

Thank you all for reading this post (and eventual solution)

[apok]

because you are reintializing the daqmx task in the loop...you need to do it once and not everytime you change the case (motor#)

[apok · Accepted solution]

try this...i do not like express vi's 

Spoiler

[iganghel]

Dear Apok,

Thank you very much for your time and answer. Your solution is working.

Best wishes,

Ionut

[apok]

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@iganghel wrote:

Dear Apok,

Thank you very much for your time and answer. Your solution is working.

Best wishes,

Ionut

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please mark as solution....so others may know and give kudos to those who helped you understand the concept better.