Siemens S5-135U/155U appendix Operating a, Programmable, Interference

Installation Guidelines

Operating a	Operation from grounded power supplies offers the best rejection of
Programmable	interference.
Controller with
Process I/Os from

aGrounded Supply

Low-Voltage Distribution e.g. TN-S System

L1

L2

L3

N

PE

À		Cabinet			Programmable Controller
Control Power Supply
AC	L+	L+/L1
DC	L±		Uint
	L1	L±/N		CPU		Floating	Floating
	N		PS	Non-Float- Non-Float-
		PE	0 V	ing Input	ing Output	Input	Output

				PE
			Protective Conductor Bar
￿			in Cabinet
			￿
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

Figure 3-8 Operating a Programmable Controller with Process I/Os from a Grounded Supply

System Manual	3-23
C79000-G8576-C199-06