Connecting
5.1 Connecting measuring sensors
2AI I 4WIRE ST analog electronic module (6ES7134-4GB11-0AB0)
20 Manual, 04/2007, A5E01076100-01
Abbreviations used
The meanings of the abbreviations in the figures below are as follows:
M+: Measuring line (positive)
M- Measuring line (negative)
M
ANA
Analog measuring circuit reference potential
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
.
In environments with a high level of EMC interference, it is advisable to connect M- to M
ANA
in order to prevent the permissible U
CM
value from being exceeded.
The following schematic representation illustrates the connection of isolated measuring
encoders to the analog input modules.
1
2
3
4
5
0
0
/
0
0
0
$'8
P$
P$
8
&0
8
LVR
0
$1$
① Logic
② Backplane bus
③ Ground bus
④ Central grounding point
⑤ Isolated measuring encoders
To Next Page
Loading...
