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Wiring
4.1
General rules and regulations for operating an ET 200X
As a component part of a plant or system, the ET 200X distributed I/O device
necessitates observance of special rules and regulations, depending on where it is
to be used.
This chapter provides an overview of the most important rules which you have to
observe for integrating the ET 200X distributed I/O device in a plant or system.
Specific application
Observe the safety and accident prevention regulations that apply to specific
applications, e.g. the directive on machinery 89/392/EEC.
EMERGENCY STOP devices
EMERGENCY STOP devices conforming with IEC 204 (corresponds to
DIN VDE 113) must remain effective in all the operating modes of the plant or
system.
Plant Start-up after certain events
The following table shows the points you have to take into account upon start-up of
a plant following certain events.
Start-up follows a voltage drop or
failure
Start-up of the ET 200X follows
an interruption of bus
communications
Start-up follows unlocking of the
EMERGENCY STOP device
4-2
If ...
No dangerous operating states may occur. If
they do, an emergency stop must be
triggered.
There must not be an uncontrolled or
undefined start-up.
Then ...
ET 200X Distributed I/O Device
EWA 4NEB 780601602-06
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