Siemens SIMATIC S7-1500/ET 200MP System Manual page 150

Line voltage
The points to note for line voltage are set out below.
• For fixed plants or systems without multipole circuit breaker, a mains disconnection
device (multipole) must be available in the building installation.
• For load current supplies, the configured rated voltage range must correspond to the local
line voltage.
• For all power circuits of the S7-1500 automation system/ET 200MP distributed I/O system,
the fluctuation/deviation of the line voltage from the rated value must be within the
permitted tolerance.
You can find additional information in the section Information on insulation tests, protection
class, degree of protection and rated voltage (Page 354).
24 V DC supply
The following describes what you must pay attention to in terms of the 24 V DC supply:
• Power supply units for the 24 V DC supply (SELV/PELV) must supply a safe extra-low
voltage according to IEC 61131-2 or IEC 61010-2-201.
• To protect the S7-1500 automation system/ET 200MP distributed I/O system from
lightning and overvoltages, use overvoltage arresters.
Suitable components for the lightning and overvoltage protection are specified in the
Defining interference-free controllers
(https://support.automation.siemens.com/WW/view/en/59193566) function manual.
Requirements for power supplies in the event of voltage interruption
Note
To ensure adherence to IEC 61131-2, only use power packs/power supply units (e.g.
230/400 V AC → 24 V DC) with a mains buffering time of at least 10 ms. Observe the relevant
requirements in your application (e.g. product standard for "burners" 30 ms according to EN
298 or 20 ms according to NAMUR recommendation NE 21) with respect to possible voltage
interruptions. The latest up-to-date information on PS components is available on the
Internet (https://mall.industry.siemens.com).
Of course, these requirements also apply to power packs/power supply units not constructed
using S7-1500 or ET 200SP/S7-300-/S7-400 technology.
Protection against electrical shock
As protection against electric shock you must connect the mounting rail and if necessary, all
other existing protective conductor connections of the S7-1500 automation system /
ET 200MP distributed I/O system conductively with the protective conductor.
You may only use conductors in the colors yellow-green for connections to protective
conductor connections.
Automation system
System Manual, 01/2023, A5E03461182-AK
7.1 Rules and regulations for operation
Wiring
149