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Connecting
4.1 Electrical isolation and grounding
EMERGENCY STOP equipment
EMERGENCY STOP devices according to IEC 60204 (corresponds to DIN VDE 113) must
remain in effect in all operating modes of the plant or system.
System startup after certain events
The table below identifies situations you must pay attention to when the system starts up
after the occurrence of certain events.
For ...
•
•
•
•
24 V DC power supply
The table below identifies what you must pay attention to for the 24 V supply.
For ...
Buildings
24 V DC supply cables, signal
cables
24 V supply
Note
You can find additional information on lightning protection in function manual Installing S7-
1500, ET 200MP, ET 200SP, ET 200AL controllers in an interference-proof manner
(https://support.industry.siemens.com/cs/ww/en/view/59193566).
Protection from external electrical effects
The table below identifies what you must pay attention to for protection from electrical
effects or faults.
For ...
all systems in which the modules
are integrated
Connection, signal and bus cables ... the cable routing and installation are correct.
28
startup after a voltage dip or power failure
startup after bus communication has been interrupted
startup after unlocking the emergency stop device
startup without the IO controller activating the IO devices
you must ensure ...
External lightning protection
Internal lightning protection
Safety extra-low voltage (SELV/PELV) with safe electrical isolation.
you must ensure that ...
... the system is connected to the protective conductor or the
functional earth to discharge electromagnetic interference.
Hardware Installation and Operating Manual, 07/2020, A5E50018670-AA
...
no dangerous operating states may
occur. If necessary, "EMERGENCY
STOP" must be forced!
an uncontrolled or undefined startup
must not occur
Provide lightening protec-
tion measures (e.g.
Blitzductors)
PN/MF Coupler
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