Siemens SIMATIC ET 200AL System Manual page 30

Connecting
5.1 Rules and regulations for operation
Introduction
Depending on the area of application, the ET 200AL distributed I/O system, as a component
of plants and systems, requires that special rules and specifications be followed.
This section gives an overview of the most important rules to be followed for integration of
the ET 200AL distributed I/O system in a plant or in a system.
Specific application
Follow the safety and accident prevention regulations applicable to specific applications, e.g.
the machinery directive.
EMERGENCY-STOP device
EMERGENCY-STOP devices according to IEC 60204 (corresponds to DIN VDE 113) must
remain in effect in all operating modes of the plant or system.
Excluding hazardous system conditions
Hazardous operating states must not occur in the following situations:
● When the plant restarts after a voltage drop or power outage.
● When the ET 200AL distributed I/O system restarts after interruption of bus
communication.
If necessary, EMERGENCY STOP must be forced!
An uncontrolled or undefined startup is not permitted after the "EMERGENCY STOP" is
unlocked.
Cables and wires
Make sure that the cables used (incl. connectors) are approved for a continuous operating
temperature of at least 70 °C.
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Distributed I/O system
System Manual, 02/2018, A5E31861578-AF
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