Siemens SIMATIC ET 200M Operating Instructions Manual page 49

3.6 Configuring the electrical structure
3.6.1 General rules and regulations for operating the ET 200M
Introduction
Depending on the particular area of application, the ET 200M programmable controller, as
part of a plant or system, requires that you observe a number of specific rules and
guidelines.
Note the safety and accident prevention directives applicable to specific application cases,
e.g. the machine guidelines.
This section outlines the most important rules you must observe to integrate your ET 200M
safely into an existing plant or system.
EMERGENCY-OFF devices
In all operating modes of the plant or system, EMERGENCY-OFF devices that conform to
IEC 60204 "Safety of machinery – electrical equipment of machines" must remain effective.
Startup of the system after certain events
The following table identifies situations you must pay attention to when the system starts up
after the occurrence of certain events.
If there is ...
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Note on Radio Interference
When several electronic components are used within a switch cabinet, the radio interference
can overlap. As a result, the permissible level of radio interference intensity in the overall
configuration may be exceeded.
Tip: Keep such modules as far away from each other as possible, if necessary use shielded
cables or filters in the supply lines or HFswitching cabinets.
ET 200M
Operating Instructions, 12/2008, EWA-4NEB780600602-08
Start-up after voltage drop or failure
Startup of the ET 200M after an
interruption of bus communication
Start-up after releasing the emergency
stop device
ET 200M start-up without the DP master
triggering the ET 200M
3.6 Configuring the electrical structure
then ...
should not cause any dangerous operating states. If
necessary, the emergency stop must be forced!
There must not be an uncontrolled or undefined
startup.
Assignment planning
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