Siemens SIMATIC S7-1500 System Manual page 74

24 V DC supply
The points to note for a 24 V DC supply are set out below:
● Power supply units for the 24 V DC supply must supply safety extra-low voltage (SELV or
PELV) in accordance with IEC 61131-2 or IEC 61010-2-201.
Protection from external electrical effects
Below are the points to note for protection from electrical effects or faults:
● The system for discharging electromagnetic interference must be connected to a
protective conductor with a sufficient cross-section for all plants with the SIMATIC Drive
Controller.
● You must ensure that all supply, signal and bus cables are correctly laid and installed.
● For signal and bus lines, a cable break, wire break or a cross-circuit must not lead to
undefined states in the plant or system.
Additional references
● Directive on handling electrostatic sensitive devices (ESD), see appendix.
● For the configuration of a plant with SIMATIC ET 200 I/O (for example ET 200SP,
ET 200MP, etc.), please see the ET 200 I/O systems
(https://support.industry.siemens.com/cs/ww/en/ps/14029/man) manuals.
● We also recommend the EMC design guidelines / Basic system requirements
(https://support.industry.siemens.com/cs/ww/en/view/60612658) configuration manual as
a source of further information on EMC.
SIMATIC Drive Controller
System Manual, 11/2019, A5E46600094-AA
6.1 Rules and regulations for operation
Connecting
73