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Chapter 8 Hardware & Software
Protection
Introduction
The DMC-1600 provides several hardware and software features to check for error conditions and
to inhibit the motor on error. These features help protect the various system components from
damage.
WARNING: Machinery in motion can be dangerous! It is the responsibility of the user to design
effective error handling and safety protection as part of the machine. Since the DMC-1600 is an
integral part of the machine, the engineer should design his overall system with protection against
a possible component failure on the DMC-1600. Galil shall not be liable or responsible for any
incidental or consequential damages.
Hardware Protection
The DMC-1600 includes hardware input and output protection lines for various error and
mechanical limit conditions. These include:
Output Protection Lines
Amp Enable - This signal goes low when the motor off command is given, when the position
error exceeds the value specified by the Error Limit (ER) command, or when off-on-error
condition is enabled (OE1) and the abort command is given. Each axis amplifier has separate
amplifier enable lines. This signal also goes low when the watch-dog timer is activated, or upon
reset. Note: The standard configuration of the AEN signal is TTL active low. Both the polarity
and the amplitude can be changed if you are using the ICM-1900 interface board. To make these
changes, see section entitled 'Amplifier Interface' pg 36.
Error Output - 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 which indicates an error
condition 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.
158 • Chapter 8 Hardware & Software Protection
DMC-1600
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