299 Programmable Hardware Manual (PHM)
© Tibbo Technology Inc.
There are three green LEDs which are connected to three control lines. LEDs light
up for the LOW state of control lines (i.e. when current passes through the diodes
of the opto-couples).
7.2.9.15
#04-8, M1S: Four 24V Isolated 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, #04-4, #04-05, #04-06, #04-07, #54
Details
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.
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).
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