Galil Motion Control DMC-18 2 Series User Manual page 44

NOTE: For systems using the ICM-2900 interconnect module, the ICM-2900 has an option to provide
optoisolation on the outputs. In this case, the user provides an isolated power supply (+5 volts to +24
volts and ground). For more information, consult Galil.
The output compare signal is TTL and is available on the ICM-2900 as CMP. Output compare is
controlled by the position of any of the main encoders on the controller. The output can be
programmed to produce an active low pulse (1usec) based on an incremental encoder value or to
activate once when an axis position has been passed. For further information, see the command OC in
the Command Reference.
The error signal output is available on the interconnect module as ERROR. This is a TTL signal which
is low when the controller has an error.
Note: When the error signal is low, the LED on the controller will be on, indicating one of the
following error conditions:
1. At least one axis has a position error greater than the error limit. The error limit is set by using the
command ER.
2. The reset line on the controller is held low or is being affected by noise.
3. There is a failure on the controller and the processor is resetting itself.
4. There is a failure with the output IC which drives the error signal.
DMC-18x2 Chapter 3 Connecting Hardware • 33
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