Siemens 2AI 2/4WIRE HF Manual page 23

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
(static or dynamic) can occur between the measuring lines M- of the input channels and the
reference point of the measuring circuit M
The permitted value for U
interference.
The following schematic representation illustrates the connection of isolated measuring
encoders to the optically isolated analog input modules.
5
①
②
③
④
⑤
2 AI I 2/4WIRE HF analog electronic module (6ES7134-4MB02-0AB0)
Manual, 04/2007, A5E01076111-01
must not be exceeded, even in environments with strong EMC
CM
4
Logic
Backplane bus
Ground bus
Central grounding point
Isolated measuring encoders
.
ANA
1
3
5.1 Connecting measuring sensors
2
Connecting
CM
23