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The module is powered by the bus expansion connector, but the COM terminal is to be connected to the opposite polarity of the input voltage. the DI circuit is an optocoupler which basically means the input activates a LED. the LED needs the circuit to be closed to activate the input.
below picture is from the internet illustrating how DI is activated not the actual circuit of the module. in our case, the module is Bi-Directional which means COM terminal can be connected to +24v or GND based on the input type (Source or Sink).
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