Optoisolated Inputs - Galil Motion Control DMC-21 5 Series User Manual

Optoisolated Inputs

The ICM-20105 allows for optoisolation on all of the digital inputs of the DMC-21x5. Input Common (INCOM)
located on the I/O 37 pin D-Sub connector of the ICM-20105 provides power to digital inputs (DI[8:1]), the Abort
input (ABRT), and Reset input (RST). Limit Switch Common (LSCOM0) located on the I/O 37 pin D-Sub connector of
the ICM-20105 provides power to the Forward Limit Switch inputs (FLSm), Reverse Limit Switch inputs (RLSm), and
Home Switch Inputs (HOMm). The optoisolated inputs are powered in banks. Table A7.2 shows all the input banks
power commons and their corresponding inputs for 1-4 axis controllers and Table A7.3 shows the input banks for
5-8 axis controllers.
To take full advantage of optoisolation, an isolated power supply should be used to provide the voltage at the
input common connection. Connecting the ground of the isolated power to the ground of the controller will bypass
optoisolation and is not recommended if true optoisolation is desired.
If there is not an isolated supply available, the 5 V
INCOM/LSCOM. The current supplied by the controller references are limited, see +5, ±12V Power Output
Specifications, pg 136 in the Appendices for electrical specifications. Using the controller reference power
completely bypasses optoisolation and is not recommended for most applications.
Electrical Specifications
Minimum current to turn off Inputs once activated (hysteresis)
Common Signal
INCOM (Bank 0)
LSCOM (Bank 0)
Table A7.2: 1-4 axis controller Input Common (INCOM) and Limit Switch Common (LSCOM) and corresponding inputs powered
Common Signal
INCOM (Bank 0)
LSCOM (Bank 0)
INCOM (Bank 1)
LSCOM (Bank 1)
Table A7.3: 5-8 axis controller Input Common (INCOM) and Limit Switch Common (LSCOM) banks and corresponding inputs powered
A7 – ICM-20105 ▫ 185
, 12 V
DC
INCOM/LSCOM Max Voltage
INCOM/LSCOM Min Voltage
Minimum current to turn on Inputs
Maximum current per input
Internal resistance of inputs
Table A7.1: Specifications for voltage and current limit
Common Signal Location
J10 on ICM-20105, pin 1
J10 on ICM-20105, pin 11
Common Signal Location
J10 on first ICM-20105, pin 1
J10 on first ICM-20105, pin 11
J10 on second ICM-20105, pin 1
J10 on second ICM-20105, pin 11
, and GND controller references may be used to power
DC
Powers Inputs Labeled
DI[8:1], ABRT, RST
FLSA, RLSA, HOMA
FLSB, RLSB, HOMB
FLSC, RLSC, HOMC
FLSD, RLSD, HOMD
Powers Inputs
DI[8:1], ABRT, RST
FLSA, RLSA, HOMA
FLSB, RLSB, HOMB
FLSC, RLSC, HOMC
FLSD, RLSD, HOMD
DI[16:9]
FLSE, RLSE, HOME
FLSF, RLSF, HOMF
FLSG, RLSG, HOMG
FLSH, RLSH, HOMH
24 V
DC
0 V
DC
1 mA
0.5 mA
11 mA
2.2 kΩ
DMC-21x5 User Manual 1.0a1