#04-6, M1S: Three 24V Isolated Inputs, Common (–)
Function: Three optically isolated inputs with common (–). Inputs are fully isolated from the system ground.
Form factor: M1S
Category: Input module
Special needs: ---
Power requirements: 5V/35mA
This Tibbit is optimized for the nominal input voltage of 24V. If no external resistor is added, these inputs activate at about 13V. Forward current should not exceed 10mA, which caps the maximum input voltage at about 30V. Add external resistors if you need to apply a higher input voltage.
There are three green LEDs connected to the three control lines. The LEDs light up for the LOW state of the control lines (i.e., when current passes through the diodes of the opto-couplers).