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S5-115U Manual
Installation Guidelines
Operating a programmable controller with field devices on grounded supply
Operation from grounded power supplies offers the best protection against interference.
Figure 3-30. Operating a Programmable Controller with Field Devices on Grounded Supply
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L1
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N
PE
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AC
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Floating
output
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Low voltage distribution
e.g. TN-S system
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Field devices
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
Control power supply
Programmable controller
Cabinet
Protective conductor
bar in cabinet
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AC
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PS
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CPU
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Non-
floating
output
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Summary of Contents for SIMATIC S5-115U
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