Siemens S5-135U/155U appendix Separate or, Common, Shutdown, CC/EU and Load

Digital Input/Output Modules

Separate or	When there is a need to switch off the load power supply separately without
Common	affecting the enabling of modules, there are the following possibilities for
Shutdown of the	producing the enable voltage. These exist even when the power supply is
CC/EU and Load	used without an additional capacitor and common shutdown.
Power Supply	230 V AC supply for CC/EU and load power supply
							b)
		a)						Battery
	±951					I/O Modules		c)
				F+
			CC/EU
				L+
			Power Supply		L+
	230V AC
		Load Power Supply 24V

Enable supply from:

a)6ES5 951-4LB11 load power supply

b)Battery

c)Terminals for 24 V on the front plate of the power supply

Common Shutdown of the CC/EU and Load Power Supply with a 230 V AC Supply

Proper functioning is ensured if the 24 V load power supply has an output capacitance of at least 4700 mF per 10 A of load current.

Other units (load power supply for 20 or 40 A) which do not meet this condition can be adapted to this requirement by connecting a 10000 mF/40 V capacitor in parallel.

	I/O Modules
	F+
	CC/EU
	L+
	Power Supply
230V AC	10000∝F/
	40V
	Load Power Supply 24V
System Manual	8-7
C79000-G8576-C199-06