Siemens SIMATIC ET 200AL System Manual page 168

Line voltage
For the line voltage, note the following:
• For stationary plants or systems without an all-pole line disconnector, there must be a
disconnector unit (all-pole) fitted in the building installation.
• For load current supplies, the configured rated voltage range must correspond to the local
line voltage.
• For all electric circuits of the IO-Link I/O modules, the fluctuation/deviation of the supply
voltage and load voltage from the rated value must be within the permitted tolerance.
You can find more information in the section Specifications for insulation, protection class,
degree of protection and rated voltage (Page 59).
24 V supply
For the 24 V supply, note the following:
• For buildings:
If there is a danger due to overvoltages, you must take lightning protection measures for
external lightning protection (e.g. lighting protection elements).
• With 24 V DC supply lines and signal lines:
If there is a danger due to overvoltages, you must take lightning protection measures for
internal lightning protection (e.g. lightning protection elements. You will find additional
information in the Designing interference-free controllers
(https://support.industry.siemens.com/cs/ww/en/view/59193566) function manual).
• For 24 V DC supply:
Ensure that there is an electrical protective separation of extra-low voltage (SELV/PELV)
according to IEC 61010-2-201 or IEC 60950-1.
1L+ is supplied via the IO-Link master. Observe the requirements of the IO-Link master
used.
2L+ is connected via port Type B or the M12-L power connector. Protect 2L+ with a UL- or
IEC-approved fuse (tripping characteristic type B or C). This fuse must conform to the cable
cross-section and must not exceed the maximum total current of the IO-Link I/O module.
Module-specific specifications can be found in the equipment manuals and on the
Internet.
Note
Wet environment
If you use IO-Link I/O modules in a wet environment, other limits apply for SELV/PELV.
IO-Link I/O modules
System Manual, 08/2021, A5E48755395-AB
5.1 Rules and regulations for operation
Connecting
25