www.baldormotion.com
4-4 Input / Output
MN1928
4.3 Analog I/O
The NextMove ES provides:
H
Two 12-bit resolution analog inputs.
H
Four 12-bit resolution analog outputs.
4.3.1 Analog inputs
The analog inputs are available on pins a28 & b28 (AIN0) and a27 & c28 (AIN1).
H
Differential inputs.
H
Voltage range: ±10 V.
H
Resolution: 12-bit with sign.
H
Input impedance: 120 k
Ω
.
H
Sampling frequency: 4 kHz maximum, 2 kHz if both inputs are enabled.
The analog inputs pass through a differential buffer and second order low-pass filter with a
cut-off frequency of approximately 1 kHz.
Both inputs are normally sampled at 2 kHz. However, an input can be disabled by setting
ADCMODE
to 4 (
_acOFF
). With one input disabled, the remaining input will be sampled at
4 kHz. In Mint, analog inputs can be read using the
ADC
keyword. See the Mint help file for full
details of
ADC
,
ADCMODE
and other related
ADC
... keywords.
NextMove ES
-
+
AIN0+
AIN0-
AGND
Mint
ADC(0)
-
+
120 k
120 k
a28
a30
b28
+12 V
-12 V
Figure 1 - Analog input, AIN0 shown
For differential inputs connect input lines to AIN+ and AIN-. Leave AGND unconnected.
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ,
07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Fax: (973) 335-1661 • www.servosystems.com
