DMC-21x3 Accessories Chapter 4 ICM-20105• 25
Opto Isolation Settings
The ICM-20105 module allows for opto-isolation on all of the digital inputs and outputs. This
includes the dedicated I/O including limits, homes, and abort. The limits and home are powered
by Limit Switch Common. The digital inputs and the Abort Input are powered by Input Common.
The digital outputs are also optically isolated and are capable of sourcing up to 0.5 A per pin with
a 3 A limit for the group of 8 outputs. The outputs are configured for hi-side drive only. The
supply voltage must be connected to output supply voltage, and the supply return must be
connected to output return.
Input Isolation
Opto isolation of the general purpose inputs and the abort input is used by powering the Input
Common line. The limit switch and home inputs are powered by Limit Switch Common. Shown
below is the circuit diagram for the isolated inputs.
IN1IN2IN3IN4IN5IN6IN7IN8ABORT
FLSX RLSX HOMEX FLSY RLSY HOMEY
Additional Limit
Switches(Dependent on
Number of Axes)
(XLATCH) (YLATCH) (ZLATCH) (WLATCH)
Limit
Switch
Common
Input
Common
Voltage
Figure 10 ICM-20105 Digital Input Isolation
RP2
2.2 kΩ
RP3
2.2 kΩ
Z and W switches
use RP1 2.2 kΩ
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