Siemens SIMATIC ET 200SP HA System Manual page 81

● Typical functional extra-low voltage (V
● IO device in PROFINET networks:
In LANs (Local Area Networks) you may only operate IO devices with PROFINET IO
interfaces in LANs (Local Area Networks) if the following condition is met:
All connected modes are operated with power supplies (e.g. power pack, battery) of the type
SELV/PELV with guaranteed electrically isolated extra-low voltage.
Line voltage
The points to note with regard to the line voltage is described below (see section Information on
insulation, protection class, degree of protection and rated voltage (Page 146)):
● For stationary plants or systems without an all-pole mains circuit breaker, there must be a
circuit breaker mechanism (all-pole) fitted in the building installation.
● For the power supply, the configured rated voltage range must correspond to the local line
voltage.
● The fluctuation/deviation of the line voltage from the rated value must be within the
permitted tolerance for all power circuits of the IO device.
Protection against outside electrical influences
Below is a description of what you must pay attention to in terms of protection against electrical
impacts and/or faults:
● In plants with HA distributed I/O, ensure that the system is connected to a protective
conductor with sufficient cross-section for discharge of electromagnetic interference.
● 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-circuit does
not lead to undefined states of the plant or system.
Reference
You can find more information in the Designing interference-free controllers
support.automation.siemens.com/WW/view/en/59193566) function manual.
See also
Hardware configuration (Page 28)
ET 200SP HA Distributed I/O system
System Manual, 08/2019, A5E39261167-AD
6.2 Rules and regulations for operation
=24VDC +-20%)
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Wiring
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