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Installation Guidelines
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
3-36
Cabinet
L+
V int
PS
L-
M int
PE
Protective conductor
bar in cabinet
24 to 230 V AC load power supply unit for
AC modules
5 to 60 V AC load power supply unit for
nonfloating DC modules
5 to 60 V AC load power supply unit for
floating DC modules
S5-115F Manual
Programmable controller
µ
P
Floating
Non-
Non-
CPU
input
floating
floating
input
output
Field devices
EWA 4NEB 811 6148-02
Floating
output
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