#04-1, M1S: Two 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

Mates with: #19, #20, #21

See also: #04-2, #04-3, #04-4, #04-05, #04-06, #04-07, #04-08, #54


tibbit_4_1 label-04_1


If no external resistor is added these inputs activate at about 2V. Forward current should not exceed 10mA, and this caps the maximum input voltage at around 5V. Add external resistors if you need to apply higher input voltage.

Combine this Tibbit with terminal block devices – #20 (nine terminal blocks) or #21 (four terminal blocks).


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).