Connecting
5.2 Ports
SCALANCE X-400
102 Operating Instructions, 06/2015, C79000-G8976-C186-12
If IE Switches X-400 are supplied over long 24 V power supply lines or networks, measures
are necessary to prevent interference by strong electromagnetic pulses on the supply lines.
These can result, for example, due to lightning or switching of large inductive loads.
One of the tests used to attest the immunity of devices of the IE Switches X-400 to
electromagnetic interference is the "surge immunity test" according to EN61000-4-5. This
test requires overvoltage protection for the power supply lines. A suitable device is, for
example, the Dehn Blitzductor VT AD 24 V type no. 918 402 or comparable protective
element.
Manufacturer: DEHN+SÖHNE GmbH+Co.KG, Hans-Dehn-Str.1, Postfach 1640, D-92306
Neumarkt, Germany.
Connectors of the signaling contact and grounding strap (X2) of the
SCALANCE X-400
Polarity reversal protection X1, X2
The two 4-pin male connectors (X1, X2) for the power supply and the signaling contact have
no polarity reversal protection. If the connectors are accidentally swapped over, this does not
cause damage or destroy circuits. Normal functionality is, however, not available while the
connectors are swapped over.
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