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I have a NI 9074 CRio and a NI 9403 Digital I/O module (along with several others types of modules). I am having trouble using the 9403 as a sourcing digital out. I can set it to output in Labview, but it will not put out a 5v signal. I am measuring this by using a volt meter between the output channel and the com pin. Am I doing something wrong? or missing a step for switching to digital out? Thanks.
I am having a similar problem with the NI 9403. I am using the 5V digital output to turn on four 5 V relays. But I am able to turn on only one relay and then the NI 9403 goes into over-current protection mode and will not turn on the other relays. I have tried using multiple channels in parallel to increase the current but it still does not work. Is there any way to prevent the NI 9403 from going into over-current protection mode? Can anyone suggest 5 V relays that can work with this card?
Please check the current requirement of your output to see if its going in to current protection mode.
This module only puts out a 2mA current for each channel. Most ssr need at least 10mA to "energize the coil". I have found a voltage conversion module at omega.ca or google this part number DR-IO-IDC-R0-028N There are 4 different models but they will turn on with as little as 1.2mA but you still wont' be able to turn 4 of them on from one single channel, but you can use one to amplify the signal to turn on as many other SSRs as you want.
