Connecting
5.1 Connecting measuring sensors
2AI U HF analog electronic module (6ES7134-4LB02-0AB0)
22 Manual, 04/2007, A5E01076007-01
Abbreviations used
The meanings of the abbreviations in the figures below are as follows:
M+: Measuring line (positive)
M- Measuring line (negative)
M
ANA
Reference potential of the analog measuring circuit
M Ground connection
L+ Rated load voltage 24 V DC
U
CM
Potential difference between inputs and reference potential of the measuring
circuit M
ANA
U
ISO
Potential difference between M
ANA
and central grounding point
Isolated measuring encoders
The isolated measuring encoders are not connected to the local ground potential. These can
be potential-free. Depending on local conditions or interference, potential differences U
CM
(static or dynamic) can occur between the measuring lines M- of the input channels and the
reference point of the measuring circuit M
ANA
.
The permitted value for U
CM
must not be exceeded, even in environments with strong EMC
interference.
The following schematic representation illustrates the connection of isolated measuring
encoders to the optically isolated analog input modules.
1
2
3
4
5
0
0
/
0
0
0
$'8
8
,62
8
&0
9
9
① Logic
② Backplane bus
③ Ground bus
④ Central grounding point
⑤ Isolated measuring encoders
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