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DMC-1700/1800 Chapter 8 Hardware & Software Protection • 177
Chapter 8 Hardware & Software
Protection
Introduction
The DMC-1700/1800 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-1700/1800 is an integral part of the machine,
the engineer should design his overall system with protection against a possible component failure on the DMC-
1700/1800. Galil shall not be liable or responsible for any incidental or consequential damages.
Hardware Protection
The DMC-1700/1800 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 3-47.
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 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.
4. There is a failure with the output IC which drives the error signal.
Input Protection Lines
General Abort - A low input stops commanded motion instantly without a controlled deceleration. For any axis in
which the Off-On-Error function is enabled, the amplifiers will be disabled. This could cause the motor to ‘coast’ to