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OE1command (Enable Off-On-Error) is given and the position error exceeds the error limit. As
shown in Figure 3-4, AEN can be used to disable the amplifier for these conditions.
The standard configuration of the AEN signal is TTL active high. In other words, the AEN signal
will be high when the controller expects the amplifier to be enabled. The polarity and the
amplitude can be changed if you are using the ICM-1900 interface board. To change the polarity
from active high (5 volts= enable, zero volts = disable) to active low (zero volts = enable, 5 volts=
disable), replace the 7407 IC with a 7406. Note that many amplifiers designate the enable input as
'inhibit'.
To change the voltage level of the AEN signal, note the state of the resistor pack on the ICM-
1900. When Pin 1 is on the 5V mark, the output voltage is 0-5V. To change to 12 volts, pull the
resistor pack and rotate it so that Pin 1 is on the 12 volt side. If you remove the resistor pack, the
output signal is an open collector, allowing the user to connect an external supply with voltages up
to 24V. A resistor should be put in line with the 24V supply to regulate current to 15mA.
DMC-1600
Figure 3-4 - Connecting AEN to an amplifier
TTL Outputs
The DMC-1600 provides eight general use outputs, an output compare and an error signal output.
The general use outputs are TTL and are accessible through the ICM-1900 as OUT1 thru OUT8.
These outputs can be turned On and Off with the commands, SB (Set Bit), CB (Clear Bit), OB
(Output Bit), and OP (Output Port). For more information about these commands, see the
Command Summary. The value of the outputs can be checked with the operand _OP and the
function @OUT[] (see Chapter 7, Mathematical Functions and Expressions).
NOTE: For systems using the ICM-1900 interconnect module, the ICM-1900 has an option to
provide optoisolation on the outputs. In this case, the user provides an isolated power supply
(+5volts to +24volts and ground). For more information, consult Galil.
The output compare signal is TTL and is available on the ICM-1900 as CMP. Output compare is
controlled by the position of any of the main encoders on the controller. The output can be
programmed to produce an active low pulse (1usec) based on an incremental encoder value or to
activate once when an axis position has been passed. For further information, see the command
OC in the Command Reference.
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.
DMC-1600
100-PIN
ICM-1900
RIBBON
ACMD
INPUT
AEN
ENABLE
GND
GND
Chapter 3 Connecting Hardware • 37
AMP
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