Siemens S5-135U/155U appendix Higher-Level Supply

Models: S5-135U/155U

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Installation Guidelines

Operating a Programmable Controller with Process I/Os from

aCentrally Grounded Supply

In systems with their own transformers or generators, the PLC is connected to the central ground. A detachable connection should be provided so that ground faults can be measured.

The PLC should be insulated from cabinet/protective conductor potential. To maintain this isolated arrangement, all connected devices must be operated with capacitive grounding or ungrounded. For this reason, programmers should only be powered via an isolating transformer.

Higher-Level Supply

 

 

 

 

 

 

L1

 

 

 

 

 

 

 

L2

 

 

 

 

 

 

 

L3

 

 

 

 

 

 

 

Detachable Con-

 

 

 

 

 

 

nection for

 

 

Programmable Controller, Insulated Arrangement

Measurement

Cabinet

 

Purposes

 

 

 

 

 

 

 

Central Ground,

 

 

 

 

 

 

 

e.g. Foundation

 

 

 

 

 

 

À

Ground

 

 

 

 

 

 

 

 

 

 

 

 

 

Control Power Supply

 

 

 

 

 

 

AC

L+

L+/L1

 

 

 

 

 

DC

 

 

 

 

 

L-

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

L±/N

Uint

CPU

 

 

 

 

L1

 

PS

 

 

 

 

 

N

PE

0 V

Non-Float-

Non-Float-

Floating

Floating

 

 

 

ing Input

ing Output

Input

Output

 

 

PE

 

 

 

 

 

 

Protective Conductor Bar in Cabinet,

 

 

 

 

 

Insulated Arrangement

 

 

 

 

 

￿

￿

 

 

 

 

 

 

 

 

 

 

 

AC

 

 

 

 

Process I/Os

 

AC

 

 

 

 

 

￿

 

 

 

 

 

 

 

24 to 230 V AC Load Supply for AC Modules

 

 

 

￿

￿

￿

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

AC

 

 

 

 

 

 

 

DC

 

 

 

 

 

 

 

 

5 to 60 V DC Load Supply for Non-Floating DC Modules

 

 

 

￿

￿

￿

 

 

 

 

 

AC

 

 

 

 

 

 

 

DC

 

 

 

 

 

 

 

 

5 to 60 V DC Load Supply for Floating DC Modules

 

 

 

L1 L2 L3 N

 

 

 

 

 

 

 

Figure 3-9 Operating a Programmable Controller with Process I/Os from a Centrally Grounded Supply

3-24

System Manual

C79000-G8576-C199-06

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Siemens S5-135U/155U appendix Higher-Level Supply