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S5-115U Manual
Differential Measurement
1
2
M0+
3
M ext
4
M ext
5
M0-
6
7
M1+
8
M ext
9
M ext
10
M1-
11
12
M2+
13
M ext
14
M ext
15
M2-
16
17
M3+
18
M ext
19
M ext
20
M3-
21
22
23
24
M4+
25
M ext
26
M ext
27
M4-
28
29
M5+
30
M ext
31
M ext
32
M5-
33
34
M6+
35
M ext
36
M ext
37
M6-
38
39
M7+
40
M ext
41
M ext
42
M7-
43
Figure 10-20. Pin Assignments of the 466 Analog Input Module in the Case of Differential
Measurement
EWA 4NEB 811 6130-02b
Analog Value Processing
Differential measurement is a method of
measuring which compensates for noise on
the line.
Each signal line is assigned its own signal refe-
rence
line.
By
measuring
between the signal line and the signal refe-
rence line, noise on both lines is compensated
for.
Unused channels also must be short-circuited
when using this method of measuring (jumper
between M+and M -).
Differential measurement is required in the
following cases:
•
When the sensors are connected to diffe-
rent supplies
•
When different signal sources are physi-
cally separate
•
When signals must be captured with high
accuracy
•
When a high level of noise is expected.
Labelling and Grouping of Channels
The channels are labelled as follows on the
module:
M0 -
Channel 1:
M1+
M1 -
:
:
Channel 7:
M7+
M7 -
The channels are arranged in groups of four,
for which separate measuring ranges can be
set:
Channel group I:
Group 0 to 3
Channel group II:
Group 4 to 7
the
difference
10-31
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