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S5-115U Manual
Operating a programmable controller with field devices on grounded supply
Operation from grounded power supplies offers the best protection against interference.
Low voltage distribution
e.g. TN-S system
L1
L2
L3
N
PE
Control power supply
AC
DC
AC
AC
AC
DC
AC
DC
Figure 3-30. Operating a Programmable Controller with Field Devices on Grounded Supply
EWA 4NEB 811 6130-02b
Cabinet
L+
L+/L1
L-
U int
L-/N
L1
PS
M int
N
PE
Protective conductor
bar in cabinet
24 to 230 V AC load power supply unit for
AC modules
5 to 60 V DC load power supply unit for
nonfloating DC modules
5 to 60 V DC load power supply unit for
floating DC modules
Installation Guidelines
Programmable controller
µ
P
Floating
Non-
Non-
CPU
input
floating
floating
input
output
Field devices
Floating
output
3-37
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