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5-2 Input / Output MN1919
5.2 Analog I/O
The MicroFlex provides as standard:
H 1 analog input on the connector block X3 (demand input)
5.2.1 Analog input - X3 (demand)
Location Connector X3, pins 12 & 13
(Mating connector: W eidmüller Minimate B2L 3.5/14)
Name AIN0
Description Single ended or differential input.
Common mode voltage range: ±10VDC.
Resolution: 12-bit (accuracy ±4.9mV)
Common mode rejection: 40dB
Input impedance: >30kΩ
Sampling interval: 125μs
The analog input can be connected as either a differential or a single ended input as shown in
Figure 25. The analog input is not optically isolated from internal power rails, so care must be
taken to avoid earth/ground loops and similar associated problems. The input buf fers provide
low pass filtering of the applied voltage. To minimize the effects of noise, the analog input
signal should be connected to the system using an individually shielded twisted pair cable with
an overall shield. The overall shield should be connected to the chassis at one end only. No
other connection should be made to the shield.
AIN0-
AIN0+
10k
LM358
Internal reference
Mint
ADC.0
MicroFlex
10k
30k
30k
+15V
-15V
10k
-
+
10k
Low pass
filter & level
correction
47pF
30k
30k
47pF
1nF
12
13
AGND
14
Figure 24 - AIN0 analog input (demand) circuit
When the MicroFlex is connected to Mint WorkBench, the analog input value (expressed as a
percentage) can be viewed using the Spy window’s Monitor tab. Alternatively , the command
Print ADC.0 can be used in the command window to return the value of the analog input.
See the Mint help file for details.
13
12
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