Galil DMC-2X00 - Manual (Page 181)

Chapter 8 Hardware & Software
Protection
Introduction
The DMC-2x00 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-2x00 is an
integral part of the machine, the engineer should design his overall system with protection against
a possible component failure on the dmc-2x00. Galil shall not be liable or responsible for any
incidental or consequential damages.
Hardware Protection
The DMC-2x00 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-2900 interface board. To make
these changes, see section entitled ‘Amplifier Interface’ pg 3-25.
Error Output - The error output is a TTL signal which indicates on error condition in the
controller. This signal is available on the interconnect module as ERROR. When the error
signal is low, this indicates on 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.
DMC-2X00 Chapter 8 Hardware & Software Protection y 171