6514 digital outputs not working

[nolsqn]

Hi all,

Its been a while that I posted here on the forum. I was out of touch from labView but recently I started working again. Currently I am working with PCI 6514 Daq card. The card has port4~7 working as digital output ports. Now the problem I am facing with is that all the ports were working fine till suddenly complete port 4 stopper working, soo instead I started using port 5 and then after a while same happend to it. I have been trying to figure it out that what happend but till now it doesnt make any sense to me. My setup is simple, I connect SH100-100-F Cable from the PCI card to the SCB-100 connector block. No external power source or anything. but strangly the ports are not workin...

Best Regards

[mikeporter]

Well, it certainly sounds like something is getting toasted. What are these outputs driving?

Mike...

[nolsqn]

I am of the same opinion but i am hopeing my hardware is not toasted... soo the outputs actually drive a relay switch which when turned on lights up some lights (20 V) but in the whole circuit I am not sure how can it get toasted ? but most importantly how to get them working back again ?

Best Regards,

Ali Asad

[Dennis_Knutson]

Do you have suppression diodes on the relay coils? Without them, you can easily fry your digital lines.

[mikeporter]

The process of getting them working again is easy: buy a new 6514 --- or maybe NI can fix the one you have.

Mike...

[nolsqn]

yup actually the card is not working  😞

[Matt-Bob]

How have you been testing to confirm the ports or the card itself (as you mention now) are not working?

[Hooovahh]

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@nolsqn wrote:

soo the outputs actually drive a relay switch which when turned on lights up some lights (20 V)

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Are you driving the coil of the relay directly from the output of the card?  Looks like the card is only capable of 75mA "on all channels"

http://sine.ni.com/nips/cds/view/p/lang/en/nid/13575

Is it possible that you are driving too much current and causing the life of the digital lines to die prematurely?