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I will use solid state relays. I may need about 20 relays. So do you think I should use digital outputs as relays or do you have some other better option?
I would recommend that you consider the NI PCI-6509. There is a document online here
which discusses the use of relays with NI products and specifically
recommend the NI 6509. In addition, there is another NI Developer Zone
document here
that might help with your decision, it is called "Choosing the Right
Industrial Digital I/O Module for Your Digital Output Sensor".
Matt Anderson
Hardware Services Marketing Manager National Instruments