Siemens SIMATIC S5-115F, User Manual

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S5-115F Manual Installation Guidelines
Operating a programmable controller with field devices on a centrally grounded supply
In plants with their own transformers or generators, the PLC is connected to the central grounding
point. A removable connection must be provided for measuring ground faults.
Installation of the PLC must be such that there is insulation between the cabinet potential and the
protective conductor potential. In order to maintain the insulation, all connected devices must be
grounded capacitively or they must be nongrounded. For this reason, programmers must be
supplied only over an isolating transformer.
Figure 3-31. Operating a Programmable Controller with Field Devices
on Centrally Grounded Supply
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L1
L2
L3
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DC
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AC
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floating
input
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Non-
floating
output
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Floating
input
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Floating
output
µ
P
Mint
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a a a a
AC
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AC
24 to 230 V AC load power supply unit for
AC modules
a a a a
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a a a a
5 to 60 V AC load power supply unit for
nonfloating DC modules
a a a a
a a a a
a a a a
DC
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a a a a
a a a a
AC
5 to 60 V AC load power supply unit for
floating DC modules
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Protective conductor bar in
cabinet, insulated
Removable connection
for measuring purposes
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Programmable controller with insulated installation
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Low voltage distribution
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
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a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a a
Field devices
Control power supply
Central operating
ground or
fundamental ground
a a a a
a a a a
a a a a
a a a a
Cabinet
a a a
a a a
a a a
PS
a a a a
a a a a
a a a a
CPU
a a a
a a a
a a a
N
a a a a
a a a a
a a a a
L+
a a a a
a a a a
a a a a
DC
a a a a
a a a a
AC
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L-
a a a a
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PE
Vint
EWA 4NEB 811 6148-02
3-37