#04-5, M1S: Two 24V Isolated Inputs
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Function: Two optically isolated inputs with independent terminals. Inputs are fully isolated from system ground.
Form factor: M1S
Category: Input module
Special needs: ---
Power requirements: 5V/30mA
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, and this caps the maximum input voltage at around 30V. Add external resistors if you need to apply higher input voltage.
There are two green LEDs which are connected to two control lines. LEDs light up for the LOW state of control lines (i.e. when current passes through the diodes of the opto-couples).