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How do the inputs work on this board?
76 views  May 23, 2022
The board has independent input banks that use a common for the input bank. Each input uses a bidirectional opto that can take signals from +5 to +24vdc. So if you apply GND to COM1, then the inputs for that bank, will activate with a voltage from +5vd to +24vdc. If COM1 is fed with a voltage between +5vdc and +24vdc, then the input will activate when a GND is fed into the input terminal.