Connecting Up; Safety When Connecting Up - Siemens CPU 412-5H Equipment Manual

Connecting up

6.1

Safety when connecting up

Safety notices
When connecting up the device, keep to the safety notices listed below.
Safety notices on use in hazardous areas
General safety notices relating to protection against explosion
EXPLOSION HAZARD
Do not connect or disconnect cables to or from the device when a flammable or combustible
atmosphere is present.
Safety notices for use according to ATEX and IECEx
If you use the device under ATEX or IECEx conditions you must also keep to the following
safety notices in addition to the general safety notices for protection against explosion:
Take measures to prevent transient voltage surges of more than 40% of the rated voltage.
This is the case if you only operate devices with SELV (safety extra-low voltage).
Provisions shall be made to prevent the rated voltage from being exceeded by transient
disturbances of more than 119 V.
Synchronization modules for S7-400H
Equipment Manual, 04/2020, A5E50072434-AA
WARNING
WARNING
WARNING
6
25