1- I want to use scxi DIO for reading about 1000 channel alarm but i want to use amethod like interrupt not polling for the ports only when alarm come the program read which one.

[FATHI]

2- can i use the DIO modules to read asignal between 14 to 24 VDC so the logic 0 is 14 and the logic 1 is 24.

3- can i use the NI-distributed Modules fieldpoints in hazardous area without safety barriers
also i want to use SCXI for thermocouples to read about 1000 channel in GAS&oil field
if it should connected using sefety berriers or there is a modules in NI products have belt in barriers.
thanks SIR.

[Aaron_G]

I can not answer questions 1 or 2, but I have a question on #3 and can provide more information after it is answered. What are you defining as a hazardous area? Do you mean something like Class 1 Div 2 or Class 1 Div 1 or do you mean safety barriers in terms of isolation between signals and humans?

FieldPoint can only be operated at or below Pollution Degree 2. FieldPoint modules are certified as double insulated for normal operating voltages of 250 Vrms.

Regards,
Aaron

[Tim_Ousley]

1)Using SCXI, You will need to poll the modules. So 32 bits/module at about 700 modules/sec, means you should be able to poll about 30 times a second.

2) an SCXI-1162HV will work if the 14V signal is wired as COM. The input will then be logic 0 for 14-16V and logic 1 for >16V.