Connecting The Reader - Siemens SIMATIC MV500 Operating Instructions Manual

• SCALANCE XM-400 with Port Extender PE408 PoE and
PoE power supply SCALANCE PS9230 PoE or SCALANCE PS924 PoE
• SCALANCE XR-500M with media module MM992-4POE or MM992-4POEC
6.3

Connecting the reader

Connecting the power supply
Permissible power supply
The device should only be connected to a 24 V DC power supply which satisfies the
requirements of safe extra low voltage (SELV).
When the device is operated on a wall, in an open rack or other similar locations, an NEC
Class 2 voltage source is needed for compliance with UL requirements (according to
UL 62368-1). In all other cases (according to IEC/EN/DlN EN 62368-1), a voltage source with
limited power (LPS = Limited Power Source) is required.
Line-side power supply
The generation of the 24 V DC power supply by a line-side power supply must be
implemented as functional extra-low voltage with safe electrical isolation (floating)
according to IEC 60364-4-41, or as SELV according to IEC/EN/DlN EN 62368-1 and
LPS/NEC Class 2.
NOTICE
Protection of the external power supply
If the optical reader is supplied via extensive supply lines or networks, interference by strong
electromagnetic pulses on the supply lines is possible, e.g. from lightning or the switching
of large loads.
The connection of the external power supply is not protected against strong
electromagnetic pulses. An external overvoltage protection module is required for this
purpose. The requirements according to EN 61000-4-5, Surge test on power supply lines,
are only met when a suitable protective element is used. A suitable device would be, for
example, the Dehn Blitzductor BVT AVD 24, article number 918 422, or a comparable
protective element.
Manufacturer:
DEHN+SOEHNE GmbH+Co.KG, Hans-Dehn-Str.1, P.O. Box 1640, D-92306 Neumarkt,
Germany
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
WARNING
Connection
6.3 Connecting the reader
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