Connection - Siemens SIMATIC NET Operating Instructions Manual

Connection

The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS complying with IEC 60950-1 / EN 60950-1 / VDE 0805-1
must be connected to the power supply terminals. The power supply unit for the equipment
power supply must comply with NEC Class 2, as described by the National Electrical Code
(r) (ANSI / NFPA 70).
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
Note
If the device is 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 strikes or switching of large inductive loads.
One of the tests used to attest the immunity of the device to electromagnetic interference is
the "surge immunity test" according to EN 61000-4-5. This test requires overvoltage
protection for the power supply lines. For example, the following protective element is
suitable:
Dehn Blitzductor BVT AVD 24V Art. No. 918 422
Manufacturer: DEHN+SÖHNE GmbH+Co.KG Hans Dehn Str.1 Postfach 1640 D-92306
Neumarkt, Germany
Note
Under sensible foreseeable circumstances, the accessible optical radiated power of the
components used represents no danger and meets the requirements for class 1 according to
IEC 60825-1 Ed.1.2:2001-08. Nevertheless, avoid looking directly into the transmitter or into
the end of a fiber-optic cable.
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
Optical link module
Operating Instructions, 01/2020, C79000-G8976-C270-06
WARNING
WARNING
6
41