Siemens SIMATIC S5-115F - Page 78

Installation Guidelines S5-115F Manual
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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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 AC load power supply unit for
nonfloating DC modules
5 to 60 V AC load power supply unit for
floating DC modules
Control power supply
Programmable controller
Cabinet
Protective conductor
bar in cabinet
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L+
3-36 EWA 4NEB 811 6148-02