2-8
VL-12CT96/7 Analog & Digital I/O Card
Analog Input Configuration
The VL-12CT96/7 board accommodates 16 single-ended or 8 differential input channels.
Input Mode
The board can be configured for three types of analog inputs: differential, single-ended, or pseudo-
differential. All inputs connected to the board must be of the same type.
When operated in differential mode, four channels can be configured to accept 4-20ma current loop
input.
Typical connections for the three input modes are shown in the figures below. Since ground loops
(current flowing between various equipment ground lines) affect analog measurements made with
reference to ground, careful attention should be paid to the ground connections shown. In particular,
the STD Bus power supply logic ground line should never be connected to earth ground when operating
in the differential or pseudo-differential modes.
Single Ended Mode
Single-ended mode is used for signals that are referenced to a common ground. It is normally used only
for higher level signals on short distance runs (less than 10 feet). 16 input channels are available in
single-ended mode.
AGND
CHANNEL 1
CHANNEL 0
OPTIONAL
V1
-
+
V0
-
+
As Shipped
V1
9
5
7
5
3
1
1
8
2
6
4
VL-12CT96
V6
VL-12CT97
9
11
12
10
8
10
2
4
6
7
9
5
3
1
V7
6
4
2
3
5
1
Figure 2-6. Single Ended Input Mode
Configuration — Analog Input
Summary of Contents for VL-12CT96
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