Analog Inputs
The DMC-40x0 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
(Ex. DMC-4020(-16bit)-C012-I000). The analog inputs are specified as AN[x] where x is a number 1 thru 8.
AQ settings
The analog inputs can be set to a range of +/-10V, +/-5V, 0-5V or 0-10V. The inputs can also be set into a
differential mode where analog inputs 2,4,6 and 8 can be set to the negative differential inputs for analog inputs
1,3,5 and 7 respectivally. See the AQ command in the command reference for more information.
Electrical Specifications
Input Impedance (12 and 16 bit) –
Single Ended (Unipolar) 42kΩ
Differential (Bipolar) 31kΩ
TTL Outputs
Output Compare
The output compare signal is TTL and is available on the I/O (A-D) D-Sub connector 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 (250 nsec) 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.
For controllers with 5-8 axes, a second output compare signal is available on the I/O (E-H) D-Sub
connector.
Error Output
The controller provides a TTL signal, ERR, to indicate a controller error condition. When an error condition occurs,
the ERR signal will go low and the controller LED will go on. An error occurs because of one of the following
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.
The ERR signal is found on the I/O (A-D) D-Sub connector.
For controllers with 5-8 axes, the ERR signal is duplicated on the I/O (E-H) D-Sub connector.
Chapter 3 Connecting Hardware • 39 DMC-40x0 User Manual
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