Siemens SIMATIC S7-1500 System Manual page 64

Wiring
5.1 Rules and regulations for operation
Line voltage
Below, everything you need to consider in terms of line voltage is described (refer to section
Information on insulation tests, protection class, degree of protection and rated voltage
(Page 244)):
● 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.
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 must have a safe galvanic isolation in
accordance with IEC 60364-4-41.
● 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
(http://support.automation.siemens.com/WW/view/en/59193566) function manual.
Protection against electrical shock
The mounting rail of the S7-1500 automation system/ET 200MP distributed I/O system has
to be connected conductively with the protective conductor as protection against electric
shock.
Protection against external electrical influences
The following describes what you must pay attention to in terms of protection against
electrical influences and/or faults:
● Make sure that the system for discharging electromagnetic interference is connected to a
protective conductor with sufficient diameter for all plants with an S7-1500 automation
system/ ET 200MP distributed I/O system.
● For supply, signal and bus lines, you must ensure that the laying of the lines and the
installation is correct.
● For signal and bus lines, you must ensure that a wire/cable breakage or a cross-wire
does not lead to undefined states of the plant or system.
Reference
Additional information can be found in the function manual, Designing interference-free
controllers (http://support.automation.siemens.com/WW/view/en/59193566).
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Automation system
System Manual, 09/2016, A5E03461182-AD