Siemens S5-135U/155U System Manual page 49

Operating a
Operation from grounded power supplies offers the best rejection of
Programmable
interference.
Controller with
Process I/Os from
a Grounded
Supply
Low-Voltage Distribution
e.g. TN-S System
L1
L2
L3
N
PE
Control Power Supply
AC
DC
AC
AC
AC
DC
5 to 60 V DC Load Supply for
Non-Floating DC Modules
AC
DC
5 to 60 V DC Load Supply
for Floating DC Modules
Figure 3-8 Operating a Programmable Controller with Process I/Os from a Grounded Supply
System Manual
C79000-G8576-C199-06
Cabinet
L+ L+/L1
L–
U
L–/N int
L1
PS
N
0 V
PE
PE
Protective Conductor Bar
in Cabinet
24 to 230 V AC Load Supply
for AC Modules
Installation Guidelines
Programmable Controller
CPU
Non-Float- Non-Float- Floating
ing Input ing Output Input
Process I/Os
Floating
Output
3-23