Operating a programmable
controller with process I/Os
from a grounded supply
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
1
2
2
2
4
4
3
6
3
6
5
PS
CPU
U
0 V
int
Figure 3-8
Operating a Programmable Controller with Process I/Os from a Grounded Supply
3
Power Supplies for Programmable Controllers and I/Os
System Manual
C79000-B8576-C199-03
3 - 25