Siemens S5-135U/155U System Manual page 319

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
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
Proper functioning is ensured if the 24 V load power supply has an output
Shutdown of the
capacitance of at least 4700 F per 10 A of load current.
CC/EU and Load
Other units (load power supply for 20 or 40 A) which do not meet this
Power Supply with
condition can be adapted to this requirement by connecting a 10000 F/40 V
a 230 V AC Supply
capacitor in parallel.
230V AC
System Manual
C79000-G8576-C199-06
a)
–951
Power Supply
230V AC
Load Power Supply 24V
CC/EU
Power Supply
Load Power Supply 24V
Digital Input/Output Modules
b)
I/O Modules
F+
CC/EU
L+
L+
I/O Modules
F+
L+
Battery
c)
10000 F/
40V
8-7