General Rules And Regulations For Operation Of Et 200 - Siemens SIMATIC S5 Manual

5.1.1

General rules and regulations for operation of ET 200

Specific The rules and regulations for safety at work and accident prevention (e.g.
application
machine-protection guidelines) must be observed in all instances.
EMERGENCY OFF
IEC 204 EMERGENCY-OFF facilities must remain effective in all operating
facilities
modes of the plant or system.
System startup
The table below lists the points to bear in mind when a system starts up after
after certain events certain events.
ET 200 restarts after voltage
collapse or power failure
ET 200 starts up when the
EMERGENCY-OFF facility is
reset
Mains power
The important points are listed in the table below.
Permanently installed
system without all-pole
mains disconnector
Load power supply modules,
power supply modules
All circuits
ET 200 Distributed I/O System
EWA 4NEB 780 6000-02a
Routing cables; connecting and installing bus connectors
When ...
System feature
A mains disconnector or a fuse must be
incorporated in the in-building wiring
system.
The voltage range must be correct for the
local mains supply.
Fluctuations/variation of mains voltage
from rated value must be within permissible
tolerance (see Technical data).
then ...
no dangerous operating statuses are
permitted to occur. If necessary, an
EMERGENCY OFF may have to be
forced.
it must be impossible for an uncontrolled
or undefined startup to occur.
System requirement
5
5-3