Wiring and Fitting
5-2
Distributed I/O System ET 200S
EWA 4NEB 780 6024-02 07
Emergency Stop Devices
Emergency stop devices complying with IEC 204 (which corresponds to
DIN VDE 113) must remain effective in all the operating modes of the plant or
system.
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.
If ... Then ...
Startup follows a voltage drop or
failure
Startup of the ET 200S follows
an interruption of bus
communication
No dangerous operating states must occur. If
necessary, force an emergency stop.
Startup follows unlocking of the
emergency stop device
There must not be an uncontrolled or
undefined start-up.
Line Voltage
The following table tells you what you have to do with regard to the line voltage.
With ... Requirements
Permanently installed plants or
systems without all-pole line disconnect
switches
There must be a line disconnect switch
or a fuse in the building installation
system.
Load power supplies, power supply
modules
The set rated voltage range must
correspond to the local line voltage.
All circuits of the ET 200S distributed
I/O system
Any fluctuation/deviation in the line
voltage from the rated value must be
within the permitted tolerances (see
Section 7.4)
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