#04-1, M1S: Two Isolated Inputs
Function: Two optically isolated inputs with independent terminals. Inputs are fully isolated from the system ground.
Form factor: M1S
Category: Input module
Special needs: ---
Power requirements: 5V/30mA
See also: #04-2, #04-3, #04-4, #04-05, #04-06, #04-07, #04-08, #54
Details
If no external resistor is added, these inputs activate at about 2V. Forward current should not exceed 10mA, which caps the maximum input voltage at about 5V. Add external resistors if you need to apply a higher input voltage.
Combine Tibbit #04-1 with terminal block devices — #20 (nine terminal blocks) or #21 (four terminal blocks).
LEDs
There are two green LEDs connected to the two 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).