295 Programmable Hardware Manual (PHM)
© Tibbo Technology Inc.
7.2.9.11
#04-4, M1S: Four Opto-inputs, Common Ground
Function: Four opto-couple inputs with the '-' terminal connected to the system
ground, independent '+' terminals
Form factor: M1S
Category: Input module
Special needs: ---
Power requirements: 5V/40mA
Mates with: #19, #20, #21 (limited use)
See also: #04-1, #04-2, #04-3, #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, and this caps the maximum input voltage at around 5V.
Add external resistors if you need to apply higher input voltage.
Note that these are not "isolated inputs" – they share the ground line with the rest
of your system. Still, the optical stage isolates your system from noise, ESD, spikes,
and other external influences.
Combine this Tibbit with terminal block devices – #20 (nine terminal blocks) or #21
(four terminal blocks).
LEDs
There are four green LEDs which are connected to four control lines. LEDs light up
for the LOW state of control lines (i.e. when current passes through the diodes of
the opto-couples).
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