Chapter 8 Hardware & Software
Protection
Introduction
The DMC-40x0 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-40x0 is an integral part of the machine, the
engineer should design his overall system with protection against a possible component failure on the DMC-40x0.
Galil shall not be liable or responsible for any incidental or consequential damages.
Hardware Protection
The DMC-40x0 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. To make these changes, see section entitled 364HAmplifier Circuit in Chapter 3.
Error Output
The error output is a TTL signal which indicates an error condition in the controller. This signal is available on the
interconnect module as ERR. 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.
4. There is a failure with the output IC which drives the error signal.
Chapter 8 Hardware & Software Protection • 177 DMC-40x0 User Manual
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