USER MANUAL Chapter 3 Connecting Hardware • 41
LSCOM
FLSX
External Resistor Needed for
Voltages > 24V
LSCOM
FLSX
External Resistor Needed for
Voltages > 24V
Configuration to source current at the
LSCOM terminal and sink current at
switch inputs
Configuration to sink current at the
LSCOM terminal and source current at
switch inputs
2.2K 2.2K
Figure 3-2. Connecting a single Limit or Home Switch to an Isolated Supply. This diagram only shows the
connection for the forward limit switch of the X axis.
NOTE: As stated in Chapter 2, the wiring is simplified when using the ICM-1900 or AMP-19X0
interface board. This board accepts the signals from the ribbon cables of the DMC-13X8 and provides
phoenix-type screw terminals. A picture of the ICM-1900 can be seen in Chapter 2. If an ICM-1900
is not used, an equivalent breakout board will be required to connect signals from the DMC-13X8.

Bypassing the Opto-Isolation:

If no isolation is needed, the internal 5 Volt supply may be used to power the switches. This can be
done by connecting a jumper between the pins LSCOM or INCOM and 5V, labeled JP3. These
jumpers can be added on either the ICM-1900 (J52) or the DMC-13X8. This can also be done by
connecting wires between the 5V supply and common signals using the screw terminals on the ICM-
1900 or AMP-19X0.
To close the circuit, wire the desired input to any ground (GND) terminal or pin out.
Analog Inputs
The DMC-13X8 has eight analog inputs configured for the range between -10V and 10V. The inputs
are decoded by a 12-bit A/D decoder giving a voltage resolution of approximately .005V. A 16-bit
ADC is available as an option. The impedence of these inputs is 10 KΩ. The analog inputs are
specified as AN[x] where x is a number 1 thru 8.
Amplifier Interface
The DMC-13X8 analog command voltage, MOCMD, ranges between +/-10V. This signal, along with
GND, provides the input to the power amplifiers. The power amplifiers must be sized to drive the
motors and load. For best performance, the amplifiers should be configured for a current mode of
operation with no additional compensation. The gain should be set such that a 10 Volt input results in
the maximum required current.
The DMC-13X8 also provides an amplifier enable signal, AEN. This signal changes under the
following conditions: the watchdog timer activates, the motor-off command, MO, is given, or the
OE1command (Enable Off-On-Error) is given and the position error exceeds the error limit. As
shown in Figure 3-3, AEN can be used to disable the amplifier for these conditions.