Siemens SCALANCE X308-2M User manual

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SCALANCE X- 
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Preface
Safety instructions
1
Introduction 2
SIMATIC NET
Network topologies 3
Industrial Ethernet Switches
SCALANCE X-300 Description of the device 4
Installation
5
Operating Instructions 6
Connecting
Configuration, displays and
display elements
7
Technical specifications
8
Approvals, certificates,
standards
9
10
Accessories
11
Graphics
Appendix
A
02/2012
A5E01113043-12

Legal information
Legal information
Warning notice system
This manual contains notices you have to observe in order to ensure your personal safety, as well as to prevent
damage to property. The notices referring to your personal safety are highlighted in the manual by a safety alert
symbol, notices referring only to property damage have no safety alert symbol. These notices shown below are
graded according to the degree of danger.
DANGER
indicates that death or severe personal injury will result if proper precautions are not taken.
WARNING
indicates that death or severe personal injury may result if proper precautions are not taken.
CAUTION
with a safety alert symbol, indicates that minor personal injury can result if proper precautions are not taken.
CAUTION
without a safety alert symbol, indicates that property damage can result if proper precautions are not taken.
NOTICE
indicates that an unintended result or situation can occur if the relevant information is not taken into account.
If more than one degree of danger is present, the warning notice representing the highest degree of danger will
be used. A notice warning of injury to persons with a safety alert symbol may also include a warning relating to
property damage.
Qualified Personnel
The product/system described in this documentation may be operated only by personnel qualified for the specific
task in accordance with the relevant documentation, in particular its warning notices and safety instructions.
Qualified personnel are those who, based on their training and experience, are capable of identifying risks and
avoiding potential hazards when working with these products/systems.
Proper use of Siemens products
Note the following:
WARNING
Siemens products may only be used for the applications described in the catalog and in the relevant technical
documentation. If products and components from other manufacturers are used, these must be recommended
or approved by Siemens. Proper transport, storage, installation, assembly, commissioning, operation and
maintenance are required to ensure that the products operate safely and without any problems. The permissible
ambient conditions must be complied with. The information in the relevant documentation must be observed.
Trademarks
All names identified by ® are registered trademarks of Siemens AG. The remaining trademarks in this publication
may be trademarks whose use by third parties for their own purposes could violate the rights of the owner.
Disclaimer of Liability
We have reviewed the contents of this publication to ensure consistency with the hardware and software
described. Since variance cannot be precluded entirely, we cannot guarantee full consistency. However, the
information in this publication is reviewed regularly and any necessary corrections are included in subsequent
editions.
Siemens AG Order number: A5E01113043-12 Copyright © Siemens AG 2010, -,
2012. Industry Sector Ⓟ 02/2012 Technical data subject to change
Postfach 48 48 All rights reserved
90026 NÜRNBERG
GERMANY

Preface
Purpose of the Operating Instructions
These Operating Instructions describe the design and functions of the compact and modular
Industrial Ethernet Switches of the SCALANCE X-300 product line and support you during
installation, commissioning, and troubleshooting on site.
Validity of the Operating Instructions
These Operating Instructions are valid for the following product groups of the SCALANCE X-
300 product line, see also section Product overview (Page 21).
● X-300
● X-300M
● XR-300M
● X-300EEC
● XR-300M EEC
● X-300M PoE
● XR-300M PoE
● MM900 media modules
● SFP transceiver
Names of the devices in these operating instructions
Within the SCALANCE X-300 product line, there are product groups, devices and variants.
Classification Description
Product line (X-300) For all devices and variants of all product groups within the SCALANCE X-300 product
line, the term "IE Switch X-300" is used.
Product group For all devices and variants of a product group, only the product group is used.
Device For a device, only the device name is used.
Variant A variant of a device represents a particular design version. They are identified by a
separate order number.
When all variants of a device are meant in the text, "(all)" is often added after the device
name.
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 3

Preface
SCALANCE X-300
4 Operating Instructions, 02/2012, A5E01113043-12
Overview of the technical documentation of the IE Switches X-300
The technical documentation of the X-300 product line is divided into hardware and software
and can be found in the following documents:
● PH - Configuration Manual (PDF)
The software is described in the configuration manual (PH) for both product lines X-300
and X-400.
● BAK - Operating Instructions (compact) on paper
The hardware of each product group is described in the Operating Instructions (compact)
(BAK).
● BA - Operating Instructions (PDF)
The hardware for all product groups and general information can be found in the
Operating Instructions (BA).
Contents Product group Type of document Document identification number
Software
description
All devices of the X-300 and X-400
product lines
PH X300/X400 C79000-G89000-C187
All devices of the X-300 product line BA X-300 A5E01113043
X-300 BAK X-300 A5E00982643A
X-300M BAK X-300M A5E02630801A
XR-300M BAK XR-300M A5E02661171A
X-300EEC BAK X-300 EEC A5E02661176A
XR-300M EEC BAK XR-300M EEC A5E02630809A
X-300M PoE BAK X-300M PoE A5E02630810A
XR-300M PoE BAK XR-300M PoE A5E02661178A
MM900 (media modules) BAK MM900 A5E02630805A
Hardware
description
SFP (transceivers) BAK SFP
Notices leaflet
A5E02630804A
A5E02648904A

Preface
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 5
Further documentation
For help on configuration and diagnostics using Web-based management, the CLI command
line interface, or SNMP, refer to the following documentation:
● Configuration Manual SCALANCE X-300 SCALANCE X-400
This configuration manual is available on the following media:
– On the supplied CD
– In 5 languages on the Internet on the pages of Siemens Automation Customer
Support under the following entry ID:
19625108 (http://support.automation.siemens.com/WW/view/en/19625108)
● SIMATIC NET - Twisted Pair and Fiber Optic Networks
This manual is available on the following media:
– On paper under order numbers:
- English version: 6GK1 970-1BA10-0AA1
- German version: 6GK1 970-1BA10-0AA0
– In 5 languages on the Internet on the pages of Siemens Automation Customer
Support under the following entry ID:
8763736 (http://support.automation.siemens.com/WW/view/en/8763736)
If you have questions on the use of SIMATIC NET products, please contact your Siemens
sales partner.
Standards and approvals
The devices of the SCALANCE X-300 product line meet the requirements for the CE mark.
For more detailed information, refer to section Approvals, certificates, standards (Page 223).
Integration in STEP 7 projects
The current GSDML file must be used for integration in STEP 7 V5.4 SP5 projects. This
applies to all products covered by these operating instructions.
You can obtain the relevant GSD file from the Internet at:
46183514 (http://support.automation.siemens.com/WW/view/en/46183514)
You will find the file for the firmware update V3.3.1 for X-300 under entry ID "46183538".

Preface
SCALANCE X-300
6 Operating Instructions, 02/2012, A5E01113043-12

Table of contents
Preface ...................................................................................................................................................... 3
1 Safety instructions ................................................................................................................................... 13
1.1 Important notes on using the device in hazardous areas ............................................................16
2 Introduction.............................................................................................................................................. 19
2.1 Basics of Ethernet switching........................................................................................................19
2.2 Product overview .........................................................................................................................21
2.2.1 Type designations........................................................................................................................21
2.2.2 Designs of the IE Switch X-300 devices ......................................................................................23
2.2.3 X-300 product group ....................................................................................................................24
2.2.4 Product group X-300M.................................................................................................................24
2.2.5 Product group XR-300M ..............................................................................................................25
2.2.6 X-300EEC product group.............................................................................................................26
2.2.7 XR-300M EEC product group ......................................................................................................27
2.2.8 Product group X-300M PoE.........................................................................................................27
2.2.9 Product group XR-300M PoE ......................................................................................................28
2.2.10 MM900 media modules................................................................................................................29
2.2.11 Product overview .........................................................................................................................31
3 Network topologies .................................................................................................................................. 33
3.1 Linear structure ............................................................................................................................33
3.2 Star/tree structure ........................................................................................................................33
3.3 Ring with redundancy manager ...................................................................................................34
3.4 Options of media redundancy......................................................................................................37
3.4.1 Media redundancy in ring topologies ...........................................................................................37
3.4.2 MRP .............................................................................................................................................39
3.4.3 HSR..............................................................................................................................................41
3.5 Redundant coupling of network segments...................................................................................42
4 Description of the device ......................................................................................................................... 45
4.1 Compatibility of SCALANCE X-300 .............................................................................................45
4.2 Product groups.............................................................................................................................47
4.2.1 X-300 product group ....................................................................................................................47
4.2.1.1 SCALANCE X304-2FE product characteristics ...........................................................................47
4.2.1.2 SCALANCE X306-1LD FE product characteristics......................................................................48
4.2.1.3 SCALANCE X307-3 product characteristics................................................................................49
4.2.1.4 SCALANCE X307-3LD product characteristics ...........................................................................50
4.2.1.5 SCALANCE X308-2LH product characteristics ...........................................................................51
4.2.1.6 SCALANCE X308-2LH+ product characteristics .........................................................................52
4.2.1.7 SCALANCE X310FE product characteristics ..............................................................................53
4.2.1.8 SCALANCE X308-2 product characteristics................................................................................54
4.2.1.9 SCALANCE X308-2LD product characteristics ...........................................................................55
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 7

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8 Operating Instructions, 02/2012, A5E01113043-12
4.2.1.10 SCALANCE X310 product characteristics .................................................................................. 56
4.2.1.11 SCALANCE X320-1FE product characteristics .......................................................................... 57
4.2.1.12 SCALANCE X320-3LD FE product characteristics..................................................................... 58
4.2.2 Product group X-300M................................................................................................................ 59
4.2.3 Product group XR-300M ............................................................................................................. 62
4.2.4 X-300EEC product group............................................................................................................ 64
4.2.4.1 Characteristics of the X-300EEC product group......................................................................... 64
4.2.5 XR-300M EEC product group ..................................................................................................... 69
4.2.5.1 SCALANCE XR324-4M EEC product characteristics................................................................. 69
4.2.6 Product group X-300M PoE ........................................................................................................ 71
4.2.6.1 SCALANCE X308-2M PoE product characteristics .................................................................... 71
4.2.7 Product group XR-300M PoE...................................................................................................... 73
4.2.7.1 SCALANCE XR324-4M PoE product characteristics ................................................................. 73
4.2.8 MM900 media modules............................................................................................................... 75
4.2.8.1 MM992-2M12 product characteristics......................................................................................... 76
4.2.8.2 General notes on MM900............................................................................................................ 80
4.2.9 SFP transceiver........................................................................................................................... 82
4.2.9.1 General notes on SFP................................................................................................................. 84
4.3 Interfaces and signaling contact of the switches ........................................................................ 85
4.3.1 Ethernet interfaces - electrical ports ........................................................................................... 85
4.3.1.1 10Base-T / 100Base-TX.............................................................................................................. 85
4.3.1.2 1000Base-T................................................................................................................................. 87
4.3.1.3 Power over Ethernet (PoE) ......................................................................................................... 88
4.3.1.4 Ports of the X308-2M PoE .......................................................................................................... 88
4.3.1.5 Ports of the XR-300M PoE.......................................................................................................... 89
4.3.1.6 Isolation between the TP ports ................................................................................................... 90
4.3.2 Ethernet interfaces - optical ports ............................................................................................... 91
4.3.2.1 1000Base-SX .............................................................................................................................. 91
4.3.2.2 1000Base-LX / 100Base-FX ....................................................................................................... 91
4.3.3 Signaling contact......................................................................................................................... 92
4.4 C-PLUG (configuration plug)....................................................................................................... 93
4.5 Components of the product......................................................................................................... 96
4.5.1 Components of the product......................................................................................................... 96
4.5.2 X-300M components of the product............................................................................................ 96
4.5.3 Components of the XR-300M product ........................................................................................97
4.5.4 X-300EEC product components ................................................................................................. 98
4.5.5 Components of the XR-300M EEC product................................................................................ 98
4.5.6 Components of the X308-2M PoE product ................................................................................. 99
4.5.7 Components of the XR-324-4M PoE product ........................................................................... 100
4.5.8 Components shipped with the MM900 product......................................................................... 100
4.5.9 Components shipped with the SFP product.............................................................................. 101
5 Installation ............................................................................................................................................. 103
5.1 Overview of the methods of installation ....................................................................................104
5.2 Installing a switch ...................................................................................................................... 105
5.2.1 Installation on a DIN rail............................................................................................................ 105
5.2.2 Installation on a standard rail .................................................................................................... 107
5.2.3 Wall mounting ........................................................................................................................... 108
5.2.4 19" rack mounting ..................................................................................................................... 109
5.2.5 19" rack mounting - X-300EEC product group.......................................................................... 114

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Operating Instructions, 02/2012, A5E01113043-12 9
5.2.6 19" rack mounting - XR-300M EEC product group....................................................................115
5.3 Inserting media modules and SFP transceivers ........................................................................119
5.3.1 Installation and removal of media modules ...............................................................................119
5.3.2 SFP installation in SFP media module ......................................................................................123
6 Connecting ............................................................................................................................................ 125
6.1 Connecting the switch................................................................................................................125
6.2 Connecting media modules/SFPs..............................................................................................126
6.3 Connecting the grounding..........................................................................................................126
6.3.1 Connecting the functional ground (XR-300M EEC)...................................................................126
6.3.2 Grounding of the X-300EEC ......................................................................................................127
6.4 Power supply..............................................................................................................................128
6.4.1 24 VDC power supply ................................................................................................................128
6.4.1.1 24 VDC safety extra low voltage................................................................................................128
6.4.1.2 24 VDC - product group X-300 ..................................................................................................130
6.4.1.3 12 / 24 VDC - product group X-300M ........................................................................................130
6.4.1.4 24 VDC - product group X-300EEC...........................................................................................131
6.4.1.5 Connecting a redundant power supply to the X-300EEC..........................................................131
6.4.1.6 24 V product group XR300M PoE..............................................................................................133
6.4.2 100 to 240 VAC power supply ...................................................................................................134
6.4.2.1 Fitting the connector for 100 to 240 V AC..................................................................................135
6.4.2.2 Connecting the 100 to 240 VAC power supply..........................................................................137
6.4.2.3 Connecting the power supply 100 to 240 VAC to X-300EEC / XR-300M EEC.........................137
6.4.2.4 Connecting the 100 to 240 V AC power supply with the XR-300M PoE ...................................139
6.5 Signaling contact........................................................................................................................140
6.5.1 24 VDC signaling contact...........................................................................................................140
6.5.2 Signaling contact 100 to 240 VAC / 60 to 250 VDC (X-300EEC)..............................................140
7 Configuration, displays and display elements ........................................................................................ 143
7.1 Assignment of slot numbers.......................................................................................................143
7.2 Show Location ...........................................................................................................................144
7.3 XR-300 diagnostics port.............................................................................................................144
7.4 The SET / SELECT button.........................................................................................................146
7.5 LED display................................................................................................................................147
8 Technical specifications......................................................................................................................... 153
8.1 Overview of operating temperatures for SCALANCE X-300 .....................................................153
8.2 X-300 technical specifications....................................................................................................154
8.2.1 Construction, installation and environmental conditions............................................................155
8.2.2 Connectors and electrical data ..................................................................................................156
8.2.3 Cable lengths .............................................................................................................................159
8.2.4 Other properties .........................................................................................................................161
8.3 X-300M technical specifications.................................................................................................163
8.3.1 Construction, installation and environmental conditions............................................................163
8.3.2 Connectors and electrical data ..................................................................................................165
8.3.3 Cable lengths .............................................................................................................................166
8.3.4 Other properties .........................................................................................................................167

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SCALANCE X-300
10 Operating Instructions, 02/2012, A5E01113043-12
8.4 XR-300M technical specifications ............................................................................................. 169
8.4.1 Construction, installation and environmental conditions........................................................... 169
8.4.2 Connectors and electrical data ................................................................................................. 171
8.4.3 Cable lengths ............................................................................................................................ 172
8.4.4 Block architecture...................................................................................................................... 173
8.4.5 Other properties ........................................................................................................................ 174
8.5 Technical specifications for X-300EEC..................................................................................... 175
8.5.1 Construction, installation and environmental conditions........................................................... 176
8.5.2 Connectors and electrical data ................................................................................................. 178
8.5.3 Cable lengths ............................................................................................................................ 180
8.5.4 Other properties ........................................................................................................................ 181
8.6 XR-300M EEC technical specifications..................................................................................... 183
8.6.1 Construction, installation and environmental conditions........................................................... 183
8.6.2 Connectors and electrical data ................................................................................................. 186
8.6.3 Cable lengths ............................................................................................................................ 188
8.6.4 Block architecture...................................................................................................................... 189
8.6.5 Other properties ........................................................................................................................ 190
8.7 X-300M PoE technical specifications........................................................................................191
8.7.1 Construction, installation and environmental conditions........................................................... 191
8.7.2 Connectors and electrical data ................................................................................................. 194
8.7.3 Cable lengths ............................................................................................................................ 196
8.7.4 Other properties ........................................................................................................................ 197
8.8 XR-300M PoE technical specifications ..................................................................................... 198
8.8.1 Construction, installation and environmental conditions........................................................... 199
8.8.2 Connectors and electrical data ................................................................................................. 200
8.8.3 Cable lengths ............................................................................................................................ 203
8.8.4 Block architecture...................................................................................................................... 204
8.8.5 Other properties ........................................................................................................................ 205
8.9 MM900 technical specifications ................................................................................................ 206
8.9.1 Construction, installation and environmental conditions........................................................... 206
8.9.2 Connectors and electrical data ................................................................................................. 208
8.9.3 Cable lengths ............................................................................................................................ 210
8.9.4 Other properties ........................................................................................................................ 212
8.10 SFP technical specifications ..................................................................................................... 213
8.10.1 SFP construction, installation and environment........................................................................ 213
8.10.2 SFP connectors and electrical data .......................................................................................... 216
8.10.3 Cable lengths for SFP............................................................................................................... 219
8.10.4 Other properties of SFP ............................................................................................................ 221
9 Approvals, certificates, standards .......................................................................................................... 223
9.1 X-300 product group ................................................................................................................. 223
9.1.1 Approvals, Certificates .............................................................................................................. 223
9.1.2 X-300 type plate ........................................................................................................................ 226
9.1.3 X-300 declaration of conformity ................................................................................................ 227
9.1.4 X-300 FDA and IEC approvals.................................................................................................. 227
9.1.5 Overview of the X-300 approvals.............................................................................................. 228
9.1.6 X-300 mechanical stability (in operation).................................................................................. 229
9.2 Product group X-300M.............................................................................................................. 229
9.2.1 X-300M approvals, certificates.................................................................................................. 229

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SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 11
9.2.2 X-300M type plate......................................................................................................................233
9.2.3 X-300M conformity certificates...................................................................................................233
9.2.4 X-300M FDA and IEC approvals................................................................................................234
9.2.5 Overview of X-300M approvals..................................................................................................235
9.2.6 X-300M mechanical stability (in operation)................................................................................236
9.3 Product group XR-300M ............................................................................................................236
9.3.1 XR-300M approvals, certificates................................................................................................236
9.3.2 XR-300M type plate ...................................................................................................................240
9.3.3 XR-300M conformity certificate..................................................................................................240
9.3.4 XR-300M FDA and IEC approvals.............................................................................................241
9.3.5 Overview of XR-300M approvals ...............................................................................................241
9.3.6 XR-300M mechanical stability (in operation) .............................................................................242
9.4 X-300EEC product group...........................................................................................................243
9.4.1 X-300EEC approvals and certificates ........................................................................................243
9.4.2 X-300EEC declaration of conformity..........................................................................................247
9.4.3 Overview of the approvals for the X-300EEC ............................................................................247
9.4.4 X-300EEC mechanical stability (in operation) ...........................................................................248
9.5 XR-300M EEC product group ....................................................................................................248
9.5.1 XR-300M EEC approvals, certificates .......................................................................................248
9.5.2 XR-300M EEC declaration of conformity ...................................................................................252
9.5.3 Overview of XR-300M EEC approvals.......................................................................................252
9.5.4 XR-300M EEC mechanical stability (in operation).....................................................................254
9.6 Product group X-300M PoE.......................................................................................................254
9.6.1 X-300M PoE approvals, certificates...........................................................................................254
9.6.2 X-300M PoE declaration of conformity ......................................................................................257
9.6.3 Overview of X-300M PoE approvals..........................................................................................258
9.6.4 X-300M PoE mechanical stability in operation ..........................................................................259
9.7 Product group XR-300M PoE ....................................................................................................259
9.7.1 XR-300M PoE approvals, certificates ........................................................................................259
9.7.2 X-300M PoE declaration of conformity ......................................................................................262
9.7.3 XR-300M PoE mechanical stability in operation........................................................................263
9.8 MM900 product group................................................................................................................263
9.8.1 MM900 approvals, certificates ...................................................................................................263
9.8.2 MM900 declaration of conformity...............................................................................................266
9.8.3 MM900 FDA and IEC approvals ................................................................................................267
9.9 Product group SFP ....................................................................................................................268
9.9.1 SFP approvals, certificates ........................................................................................................268
9.9.2 SFP type plate............................................................................................................................271
9.9.3 SFP declaration of conformity....................................................................................................271
9.9.4 SFP FDA and IEC approvals .....................................................................................................272
9.9.5 Overview of the SFP approvals .................................................................................................273
9.9.6 SFP mechanical stability (in operation) .....................................................................................275
10 Accessories ........................................................................................................................................... 277
10.1 Accessories................................................................................................................................277
11 Graphics ................................................................................................................................................ 279
11.1 Dimension drawing ....................................................................................................................279

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SCALANCE X-300
12 Operating Instructions, 02/2012, A5E01113043-12
11.2 X-300M dimension drawings..................................................................................................... 284
11.3 XR-300M dimension drawings .................................................................................................. 286
11.4 X-300EEC dimension drawings ................................................................................................ 289
11.5 XR-300M EEC dimension drawings.......................................................................................... 291
11.6 MM900 dimension drawings ..................................................................................................... 297
11.7 SFP dimension drawings .......................................................................................................... 300
11.8 X-300M PoE dimension drawings.............................................................................................301
11.9 XR-300M PoE dimension drawings .......................................................................................... 304
A Appendix................................................................................................................................................ 307
A.1 TP port....................................................................................................................................... 307
A.2 Fitting the IE FC RJ-45 Plug ..................................................................................................... 309
A.3 Electrical tests (EEC devices)................................................................................................... 311
Index...................................................................................................................................................... 313

Safety instructions 1
Safety notices on the use of the devices
The following safety notices must be adhered to when setting up and operating the device
and during all associated work such as installation, connecting up, replacing devices or
opening the device.
Safety requirements for installation
According to the UL/CSA certification, the devices are an "open type".
To fulfill requirements for safe operation with regard to mechanical stability, flame
retardation, stability, and shock-hazard protection, the following alternative types of
installation are specified:
● Installation in a suitable cabinet.
● Installation in a suitable enclosure.
● Installation in a suitably equipped, enclosed control room.
General information
WARNING
Opening the device
DO NOT OPEN WHEN ENERGIZED.
WARNING
Safety extra low voltage (only devices with 24 VDC power supply)
The equipment is designed for operation with Safety Extra-Low Voltage (SELV) by a
Limited Power Source (LPS).
This means that only SELV / LPS (Limited Power Source) 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).
There is an additional requirement if devices are operated with a redundant power supply:
If the equipment is connected to a redundant power supply (two separate power supplies),
both must meet these requirements.
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 13

Safety instructions
SCALANCE X-300
14 Operating Instructions, 02/2012, A5E01113043-12
General notices regarding use in hazardous areas
WARNING
Risk of explosion when connecting or disconnecting the device
EXPLOSION HAZARD
DO NOT CONNECT OR DISCONNECT EQUIPMENT WHEN A FLAMMABLE OR
COMBUSTIBLE ATMOSPHERE IS PRESENT.
WARNING
Replacing components
EXPLOSION HAZARD
SUBSTITUTION OF COMPONENTS MAY IMPAIR SUITABILITY FOR CLASS I, DIVISION
2 OR ZONE 2.
WARNING
Requirements for the cabinet/enclosure
When used in hazardous environments corresponding to Class I, Division 2 or Class I,
Zone 2, the device must be installed in a cabinet or a suitable enclosure.

Safety instructions
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 15
Notices for use in hazardous areas according to ATEX
WARNING
Requirements for the cabinet/enclosure
To comply with EU Directive 94/9 (ATEX95), this enclosure must meet the requirements of
at least IP54 in compliance with EN 60529.
The fiber-optic bus connections labeled SCALANCE MM900 (see type plate) may also be
led through a hazardous area zone1 (see also MM900 approvals, certificates (Page 263),
section "Explosion Protection Directive (ATEX)").
WARNING
Suitable cables for temperatures in excess of 70 °C
If the cable or conduit entry point exceeds 70°C or the branching point of conductors
exceeds 80°C, special precautions must be taken.
If the equipment is operated in an air ambient in excess of 50 °C, only use cables with
admitted maximum operating temperature of at least 80 °C.
WARNING
Protection against transient voltage surges
Provisions shall be made to prevent the rated voltage from being exceeded by transient
voltage surges of more than 40%. This criterion is fulfilled, if supplies are derived from
SELV (Safety Extra-Low Voltage) only.
See also
MM900 approvals, certificates (Page 263)

Safety instructions
1.1 Important notes on using the device in hazardous areas
SCALANCE X-300
16 Operating Instructions, 02/2012, A5E01113043-12
1.1 Important notes on using the device in hazardous areas
WARNING
WARNING - EXPLOSION HAZARD -
DO NOT DISCONNECT WHILE CIRCUIT IS LIVE UNLESS AREA IS KNOWN TO BE
NON-HAZARDOUS.
WARNING
Restricted area of application
This equipment is suitable for use in Class I, Division 2, Groups A, B, C and D or non-
hazardous locations only.
WARNING
Restricted area of application
This equipment is suitable for use in Class I, Zone 2, Group IIC or non-hazardous locations
only.
Note on devices with power supply 100 to 240 V AC
DANGER
Danger from line voltage
Devices with this mark have a 100 to 240 V AC power supply.
This product can only function correctly and safely if it is transported, stored, set up, and
installed correctly, and operated and maintained as recommended.
Connecting and disconnecting may only be performed by an electrical specialist. Connect
or disconnect power supply cables only when the power is turned off!
WARNING
Devices with a 100 to 240 V AC power supply do not have an ATEX approval.
Devices with a 100 to 240 V AC power supply are not approved for use in hazardous areas
according to EC-RL-94/9 (ATEX).
CAUTION
Securing cables with dangerous voltage
Make sure that the connector cannot be released accidentally by pulling on the connecting
cable. Lay the cables in cable ducts or cable channels and secure the cables, where
necessary, with cable ties.

Safety instructions
1.1 Important notes on using the device in hazardous areas
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 17
Safety requirements for installation
According to the IEC 61131-2 standard and therefore in accordance with the EU directive
2006/95/EC (Low Voltage Directive), the devices are "open equipment" and in accordance
with UL/CSA certification, they are an "open type".
To fulfill requirements for safe operation with regard to mechanical stability, flame
retardation, stability, and shock-hazard protection, the following alternative types of
installation are specified:
● Installation in a suitable cabinet.
● Installation in a suitable enclosure.
● Installation in a suitably equipped, enclosed control room.

Safety instructions
1.1 Important notes on using the device in hazardous areas
SCALANCE X-300
18 Operating Instructions, 02/2012, A5E01113043-12

Introduction 2
2.1 Basics of Ethernet switching
Ethernet switching
Ethernet switches forward data packets directly from the input port to the appropriate output
port during data exchange based on the address information. Ethernet switches operate on a
direct delivery basis.
Essentially, switches have the following functions:
● Connecting collision domains / subnets
Since repeaters and star couplers (hubs) operate at the physical level, their use is
restricted to the span of a collision domain. Switches connect collision domains. Their use
is therefore not restricted to the maximum span of a repeater network. On the contrary,
extremely large networks with very large spans are possible with switches. The distances
achieved depend on the fiber-optic interfaces used in the devices and the FO fibers used
(see technical specifications).
● Load containment
By filtering the data traffic based on the Ethernet (MAC) addresses, local data traffic
remains local. In contrast to repeaters or hubs, which distribute data unfiltered to all ports
/ network nodes, switches operate selectively. Only data intended for nodes in other
subnets is switched from the input port to the appropriate output port of the switch. To
make this possible, a table assigning Ethernet (MAC) addresses to output ports is
created by the switch in a "teach-in" mode.
● Limiting the propagation of errors to the subnet involved.
By checking the validity of a data packet on the basis of the checksum which each data
packet contains, the switch ensures that bad data packets are not transported further.
Collisions in one network segment are not passed on to other segments.
The need for Industrial Ethernet switches
With over 95% of LANs based on Ethernet, this is the most commonly used technology. The
use of switches is particularly important: They allow extensive networks with large numbers
of nodes to be set up, increase the data throughput, and simplify network expansion.
The IE Switches X-300 from SIMATIC NET are designed for use in high-speed plant
networks that will also meet future requirements. With the HSR redundancy function and
standby linking of rings, high network availability can be achieved. HSR and standby link
reconfigures the network within 300 ms. Support of IT standards such as VLAN, RSTP,
IGMP, and GARP makes seamless integration of automation networks in existing office
networks possible.
The IE Switches X-300 are designed for use in switching cubicles and cabinets.
SCALANCE X-300
Operating Instructions, 02/2012, A5E01113043-12 19

Introduction
2.1 Basics of Ethernet switching
SCALANCE X-300
20 Operating Instructions, 02/2012, A5E01113043-12
Technical options (network topologies)
The IE Switches X-300 simplify the expansion of a network regardless of the network
topology.
You can use an IE Switch X-300 in the following network topologies:
● Linear structure
● Star/tree structure
● Ring with redundancy manager
The maximum cable length is 70 km for single mode gigabit transmission. A mixed topology
consisting of IE Switch X-300 devices and OSMs/ESMs is possible at the electrical ports. A
mixed topology consisting of IE Switch X-300 devices and an OSM via the optical ports is not
possible.
Using an IE Switch X-300 as the redundancy manager in a ring with redundancy manager
provides greater availability. If there is an interruption on the connection between these
switches, the IE Switch X-300 used as redundancy manager acts like a switch and in a very
short time creates a line from the ring. As a result, a functional, end-to-end structure is
restored. For information on this topic, refer to the Configuration Manual "SIMATIC NET -
Industrial Ethernet Switches SCALANCE X-300 SCALANCE X-400."