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DMC-1700/1800 Appendices • 219
Opto-Isolated Outputs ICM-1900 / ICM-2900 (-Opto option)
The ICM/AMP 1900 and ICM-2900 modules from Galil have an option for opto-isolated outputs.
Standard Opto-isolation and High Current Opto-isolation:
The Opto-isolation option on the ICM-1900 has 2 forms: ICM-1900-OPTO (standard) and ICM-1900-OPTOHC
(high current). The standard version provides outputs with 4ma drive current / output with approximately 2 usec
response time. The high current version provides 25ma drive current / output with approximately 400 usec response
time.
Figure A.2 – Opto Output Circuit
The ISO OUT POWER (OUT POWER ON ICM-2900) and ISO POWER GND (OUT GND ON ICM-2900) signals
should be connected to an isolated power supply. This power supply should be used only to power the outputs in
order to obtain isolation from the controller. The signal “OUT[x]” is one of the isolated digital outputs where X
stands for the digital output terminals.
The default configuration is for active high outputs. If active low outputs are desired, reverse RP3 in it’s socket.
This will tie RP3 to GND instead of VCC, inverting the sense of the outputs.
NOTE: If power is applied to the outputs with an isolated power supply but power is not applied to the controller,
the outputs will float high (unable to sink current). This may present a problem when using active high logic and
care should be taken. Using active low logic should avoid any problems associated with the outputs floating high.
64 Extended I/O of the DMC-17x8/1700/1800 Controller
The DMC-17x8/1700/1800 controller offers 64 extended I/O points, which can be interfaced to Grayhill and OPTO-
22 I/O mounting racks. These I/O points can be configured as inputs or outputs in 8 bit increments through
software. The I/O points are accessed through two 50-pin IDC connectors, each with 32 I/O points.
Configuring the I/O of the DMC-17x8 (and DMC-1750 to DMC-
1780 & DMC-1810 to 1880, with DB-14064)
The 64 extended I/O points of the DMC-17x8 (and 1750-1780 & 1810-1880 w/DB-14064) series controller can be
configured in blocks of 8. The extended I/O is denoted as blocks 2-9 or bits 17-80.
The command, CO, is used to configure the extended I/O as inputs or outputs. The CO command has one field:
ISO OUT POWER (ICM-1900,PIN 19)
OUT POWER (ICM-2900)
ISO POWER GND (ICM-1900,PIN 35)
OUT GND (ICM-2900)
OUT[x] (66 - 73)
ICM-1900 / ICM-2900
CONNECTIONS
RP4=10K OHMS
FROM
CONTROLLER
+5V
OUT[x] TTL
RP3
RP4 on ICM1900=10K OHMS
RP2 on ICM2900