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5-2 Input / Output
MN1943
5.2 Analog I/O
The MotiFlex
e
100 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 & 24
(Mating connector: Weidmüller Minimate B2L 3.5/24 LH)
Name
AIN0
Description
Single ended or differential input.
Common mode voltage range: ±10 VDC.
Resolution: 12-bit (accuracy ±4.9 mV)
Common mode rejection: 40 dB
Input impedance: >30 k
Ω
Sampling interval: 125
μ
s
The analog input can be connected as either a differential or a single ended input as shown in
Figure 42. 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 buffers 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+
LM258
Internal reference
Mint
ADC(0)
MotiFlex
e
100
+15V
-15V
-
+
Low pass
filter & level
correction
12
24
AGND
11
Figure 41 - AIN0 analog input (demand) circuit
When the MotiFlex
e
100 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.
24
12
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