Siemens SIMATIC ET 200S Manual page 130

Wiring and Fitting
Startup of the system after specific events
The following table tells you what you should do when the system starts up after
the occurrence of specific events.
Startup follows a voltage drop or
failure
Startup of the ET 200S follows
an interruption of bus
communication
Startup follows unlocking of the
emergency stop device
Line voltage
The following table tells you what you have to do with regard to the line voltage.
Permanently installed plants or systems
without all-pole line disconnect switches
Load power supplies, power supply
modules
All circuits of the ET 200S distributed I/O
system
5-2
If ...
No dangerous operating states must occur. If
necessary, force an emergency stop.
There must not be an uncontrolled or
undefined start-up.
With ...
then ...
Requirements
There must be a line disconnect switch or a
fuse in the building installation system.
The set rated voltage range must
correspond to the local line voltage.
Any fluctuation/deviation in the line voltage
from the rated value must be within the
permitted tolerances (see Section 7.4)
ET 200S Distributed I/O System
EWA-4NEB 780602402-12