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48 • Chapter 3 Connecting Hardware DMC-1700/1800
the ICM-1900interface 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.
100-PIN
HIGH
DENSITY
CABLE
MOCMDX
AMPENX
GND
ICM-1900/2900DMC-1700/1800
+5V+12V
SERVO MOTOR
AMPLIFIER
Analog Switch
Connection to +5V or +12V made
through Resistor pack RP1. Removing
the resistor pack allows the user to
connect their own resistor to the desired
voltage level (Up to24V). Accessed by
removing Interconnect cover.
7407 Open Collector
Buffer. The Enable
signal can be inverted
by using a 7406.
Accessed by removing
Interconnect cover.
Figure 3-3 - Connecting AEN to the motor amplifier
TTL Inputs
1X80
As previously mentioned, the DMC-1700/1800 has 8 uncommitted TTL level inputs for controllers
with 5 or more axes. These are specified as INx where x ranges from 17 thru 24 and are interrogated
using the operand @IN[x]. The reset input is also a TTL level, non-isolated signal and is used to
locally reset the DMC-1700/1800 without resetting the PC.
TTL Outputs
The DMC-1700/1800 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