Wiring
5.1 Rules and regulations for operation
Distributed I/O system
76
System Manual, 12/2016, A5E03576849-AG
24 V DC supply
Below you will find a description of what you need to pay attention to with 24 V DC 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 24 V DC supply lines and signal lines: If there is a risk of overvoltages, you need to
take precautions to ensure internal lightning protection (e.g. lightning protection
elements,
refer to section Accessories/spare parts (Page 286)).
●
For 24 V DC supply: Ensure safe (electrical) isolation and separate cable laying or
increased insulation of the extra-low voltage (SELV/PELV) to circuits with hazardous
potentials in accordance with IEC 60364-4-41.
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:
●
Make sure that the system for discharging electromagnetic interference is connected to a
protective conductor with sufficient cross-section for all plants with an ET 200SP
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 break 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
http://support.automation.siemens.com/WW/view/en/59193566
) function manual.
Summary of Contents for Simantic ET200SP
Page 1: ......
