Siemens SIMATIC S7-1200 Betriebsanleitung - Seite 7

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Siemens SIMATIC S7-1200 Betriebsanleitung

1.2

Introduction

What is possible?

The CSM 1277 device allows the cost-effective installation of Industrial Ethernet bus or star

structures with switching functionality.

Note

It is not possible to use the CSM 1277 switch in a redundant ring because it does not support

redundancy.

Note

If the CSM 1277 switch 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 or switching of large inductive loads.

One of the tests used to attest the immunity of the switch to electromagnetic interference

was 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

When used under hazardous conditions (zone 2), the CSM 1277 switch must be installed in

an enclosure.

To comply with ATEX 95 (EN 60079-15), this enclosure must be at least IP54 in

compliance with EN 60529.

WARNING – EXPLOSION HAZARD: DO NOT DISCONNECT EQUIPMENT WHEN A

FLAMMABLE OR COMBUSTIBLE ATMOSPHERE IS PRESENT.

Compact Switch Module CSM 1277

Operating Instructions, V. 1.20, A2B00079397B

WARNING

Introduction

1.2 Introduction