As shown in the circuit on the right, when Compact RIO A and B are configured as a double deck that always operates independently, and the 24 volt photocoupler output from Ext-1 is interfaced to the NI9425 input port to operate, I want to know if it should be connected through a diode like pair1.
Or I would like to know if it is possible to connect like pair2,3 without a diode.
It is difficult to judge because the NI9425 internal circuitry is unknown.
I want to know if there are any tools or training courses on Software Verification and validation at NI.