Siemens SIMATIC ET 200S Operating Instructions Manual page 77

ET 200S in the overall configuration
The figure below shows the ET 200S distributed I/O system in the overall configuration (load
voltage supply and grounding concept) with incoming supply from a TN-S system.
L1
L2
L3
N
PE
1
Figure 5-1
ET 200S
Operating Instructions, 08/2008, A5E00515771-06
5.2 Operating the ET 200S on a grounded incoming supply
Mounting rail
2
AC
1L+
DC
1M
Ground bus
2
AC
DC
2
AC
AC
Operation of ET 200S with grounded reference potential
Low voltage distribution e.g.
TN-S system (3 x 400 V)
FE: Functional earth for direct diversion
of interference levels to the mounting rail via
spring contact
ET 200S
FE FE FE FE FE FE FE FE
Load circuit
400 VAC for motor starters
Load circuit 24 VDC for electronic modules and
motor starters
Load circuit 120 VAC / 230 VAC for AC modules
Wiring and assembly
PE (AUX1)
Shield support for supporting
cable shields
2
3
3
77