Siemens SIMATIC ET 200SP HA, System Manual

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6.2 Rules and regulations for operation
Introduction
The integration of IO devices in a plant or system demands that specific rules and regulations
are observed, depending on the area of application.
This section provides an overview of the most important rules that must be observed.
Specific application
Keep to the safety and accident prevention regulations applying to specific applications, for
example machine protection guidelines.
EMERGENCY STOP devices
EMERGENCY STOP devices in accordance with IEC 60204 (corresponds to DIN VDE 0113)
must remain effective in all operating modes of the plant or system.
Excluding hazardous plant states
You need to implement suitable measures to ensure that dangerous operating conditions are
excluded, also in the following situations:
● When the system restarts after a voltage dip or power failure.
● Bus communication starts automatically after a fault.
If necessary, EMERGENCY STOP must be forced!
An uncontrolled or undefined startup must not occur after the EMERGENCY STOP is unlocked.
Supply voltage
The following section describes the important factors you need to consider with respect to the
power supply:
● For buildings: In the event of danger through overload, you must provide lightning protection
measures for external lightning protection (e.g. lightning protection elements).
● For the cables of the supply voltage (24 V DC) and the signals:
If there is danger of overvoltage, you must implement lightning protection measures for
internal lightning protection (for example, lightning protection elements; see
section Accessories/spare parts (Page 171)).
● For supply voltage:
Ensure that there is a safe (electrical) separation of low voltage (SELV/PELV).
The following standard must be complied with: IEC/UL61010-2-201
Wiring
6.2 Rules and regulations for operation
ET 200SP HA Distributed I/O system
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System Manual, 08/2019, A5E39261167-AD