Siemens S5-135U/155U - Page 49

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