VL-12CT96/7 Analog & Digital I/O Card
2-11
Current Loop Mode
In addition to voltage mode inputs, the VL-12CT96/7 can accept up to four 4-20 ma current loop inputs.
Channels 0 through 3 can be converted to current-loop input by installing 200 to 250
Ω
, ¼W, 0.1%
precision resistors in locations R4 through R7 respectively.
The board must be jumpered for differential mode, and the input range should be jumpered for ±5V
operation when using current loop inputs. A signal proportional to the 4-20 ma current is developed
across the precision resistors. This voltage is applied to the VL-12CT96/7 as a differential-mode signal,
and is converted into digital values.
CHANNEL 0
LOOP
I
1
2
V1
11
9
7
3
5
1
10
12
3
1
5
8
4
6
9
7
2
4
6
V7
10
8
VL-12CT97
2
5
1
3
6
4
2
V6
VL-12CT96
R4
R5
R6
R7
+
-
Figure 2-10. Current Loop Input Mode
Configuration — Analog Input
Summary of Contents for VL-12CT96
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