Connection
4.1 General rules and regulations for operating the ET 200pro
ET 200pro distributed I/O system
68 Operating Instructions, 03/2013, A5E00335544-08
The following table identifies requirements you must observe for the 24 V DC supply.
buildings external lightning
Install lightning protection
(e.g. lightning protection
elements).
24 V DC power supply cables, signal cables internal lightning
24 V DC power supply Safe (electrical) isolation of safety extra-low voltage
Looping-through of the supply voltage
Voltage drop at looping-through
Protection against external electrical interference
The table below shows how you must protect your system against electrical interference or
faults.
all plants or systems in which the ET 200pro
is integrated
the plant or system must be grounded observing EMC
in order to dissipate electromagnetic interferences.
the cable routing and installation is correct.
signal and bus cables a cable/conductor break does not cause undefined
Commissioning ET 200pro (Page 155)
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