Wiring
6.1 Rules and regulations for operation
ET 200MP Distributed I/O System
52 System Manual, 01/2013, A5E03723484-01
Line voltage
Below is described, what you must pay attention to with respect to the supply voltage (see
the chapter Statements on insulation, protection class, degree of protection, and rated
voltag
e (Page 105)):
● For fixed plants
or systems without multipole circuit breaker, a mains disconnection
device (multipole) must be available in the building installation.
● For load power supplies, the configured rated voltage range must correspond to the local
line voltage.
● For all power circuits of the ET 200MP distributed I/O system, the fluctuation/deviation of
the line voltage from the rated value must be within the permitted tolerance.
24 VDC supply
The following describes what you must pay attention to in terms of the 24 V DC supply:
● For buildings: In the event of danger through overvoltage, you must provide lightning
protection measures for external lightning protection (e.g. lightning protection elements).
● For 24 V DC supply lines and signal lines: In the event of danger through overvoltage,
you must provide lightning protection measures for internal lightning protection (e.g.
lightning protection elements).
● For 24 V DC supply: Ensure safe (electrical) isolation of the low voltage (SELV/PELV) in
accordance with IEC 60364-4-41.
Protection against external electrical influences
The following describes what you must pay attention to in terms of protection against
electrical impacts and/or faults:
● For all plants or systems in which the ET 200MP distributed I/O system is integrated, you
must ensure that the plant and/or system is connected to a protective conductor with
sufficient cross-section for conducting electromagnetic disturbances.
● 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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