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DMC-3425 Chapter 8 Hardware & Software Protection• 151
Chapter 8 Hardware & Software
Protection
Introduction
The DMC-3425 provides several hardware and software features to check for error conditions and to
inhibit the motor on error. These features help protect the 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-3425 is an
integral part of the machine, the engineer should design his overall system with protection against a
possible component failure on the DMC-3425. Galil shall not be liable or responsible for any
incidental or consequential damages.
Hardware Protection
The DMC-3425 includes hardware input and output protection lines for 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 an off-on-error condition is
enabled (OE1) and the abort command is given. Each axis amplifier has a separate enable line. This
signal also goes low when the watch-dog timer is activated. 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-1460 interface board. To make these changes, see section entitled ‘Amplifier Interface’.
Note: There is only one amplifier enable signal for the DMC-3425. Therefore, both amplifiers will be
controlled by the same enable output.
Error Output - The error output is a TTL signal that indicates an error condition in the controller.
This signal is available on the interconnect module as ERROR. When the error signal is low, this
indicates 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.