Siemens OSM, ESM User Manual

SIMATIC NET

Industrial Ethernet OSM/ESM

Operating Instructions

Preface, Contents

Introduction 1

Functions 2

Network Topologies with OSM/ESM

Interfaces, Displays and Operator Controls

Installation, Commissioning 5

Firmware Update 6

Technical Specifications 7

Standards and Approvals 8

Glossary 9

Release 05/2003

C79000-Z8976-C068-10

References 10

Index 11

Classification of Safety-Related Notices

This document contains notices which you should observe to ensure your own personal safety, as well as to protect the product and connected equipment. These notices are highlighted in the manual by a warning triangle and are marked as follows according to the level 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 can result if proper precautions are not taken.

Caution

with warning triangle indicates that minor personal injury can result if proper precautions are not taken.

Caution

without warning triangle indicates that damage to property can result if proper precautions are not taken.

Notice

indicates that an undesirable result or status can occur if the relevant notice is ignored.

Note

highlights important information on the product, using the product, or part of the documentation that is of particular importance and that will be of benefit to the user.

The reproduction, transmission or use of this document or its contents is not permitted without express written authority. Offenders will be liable for damages. All rights, including rights created by patent grant or registration of a utility or design, are reserved.

Siemens AG Automation and Drives Postfach 48 48, D-90327 Nuernberg

Disclaimer

We have checked the contents of this manual for agreement with the hardware and software described. Since deviations cannot be precluded entirely, we cannot guarantee full agreement. However, the data in this manual are reviewed regularly and any necessary corrections included in subsequent editions. Suggestions for improvement are welcome.

C79000-Z8976-C068-10 © Siemens AG 2001/2003 Technical data subject to change.

Siemens Aktiengesellschaft Printed in the Federal Republic of Germany

Trademarks

SIMATIC, SIMATIC NET, SINEC and SIMATIC NET Networking for Industry are registered trademarks of Siemens AG.

Third parties using for their own purposes any other names in this document which refer to trademarks might infringe upon the rights of the trademark owners.

Safety Instructions Regarding your Product

Before you use the product described here, read the safety instructions below thoroughly.

Qualified Personnel

Only qualified personnel should be allowed to install and work on this equipment . Qualified persons are defined as persons who are authorized to commission, to ground, and to tag circuits, equipment, and systems in accordance with established safety practices and standards.

Correct Usage of Hardware Products

Please note the following regarding the correct usage of hardware products:

Caution

This device and its components may only be used for the applications described in the catalog or the technical description, and only in connection with devices or components from other manufacturers which have been approved or recommended by Siemens.

This product can only function correctly and safely if it is transported, stored, set up, and installed correctly, and operated and maintained as recommended.

Before you use the supplied sample programs or programs you have written yourself, make certain that no injury to persons nor damage to equipment can result in your plant or process.

EU Directive: Do not start up until you have established that the machine on which you intend to run this component complies with the directive 89/392/EEC.

Correct Usage of Software Products

Please note the following regarding the correct usage of software products:

Caution

This software may only be used for the applications described in the catalog or the technical description, and only in connection with devices or software products from other manufacturers which have been approved or recommended by Siemens.

Before you use the supplied sample programs or programs you have written yourself, make certain that no injury to persons nor damage to equipment can result in your plant or process.

Prior to Startup

Before putting the product into operation, note the following warning:

Caution

Prior to startup you must observe the instructions in the relevant documentation. For ordering data of the documentation please refer to the catalogs or contact your local SIEMENS representative.

Siemens AG Automation and Drives Postfach 48 48, D-90327 Nuernberg

Siemens Aktiengesellschaft Printed in the Federal Republic of Germany

Disclaimer

C79000-Z8976-C068-10 © Siemens AG 2001/2003 Technical data subject to change.

Preface

Purpose of the Operating Instructions

These Operating Instructions provide you with support during configuration, commissioning, and troubleshooting of networks with Industrial Ethernet OSMs (Optical Switch Module) and Industrial Ethernet ESMs (Electrical Switch Module).

The Package

The OSM/ESM includes the following components:

• OSM/ESM device

• 6-pin plug-in terminal block for connection of the power supply and the signaling

contact

Preface

• One or two 6-pin plug-in terminal blocks for OSMs/ESMs with digital inputs

• Kit for wall mounting or mounting in 19" cubicle

• Product information bulletin

• CD

Installing an OSM/ESM

• Follow the instructions in Chapter 5 of these operating instructions.

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Preface

Validity of the Operating Instructions

These operating instructions are valid for the following devices:

• OSM ITP62

• OSM ITP62-LD

• OSM ITP53

• ESM ITP80

• OSM TP62

• ESM TP80

• OSM BC08

• OSM TP22

• ESM TP40

Further Documentation

The OSM/ESM Network Management manual /1/ describes how to operate the OSM/ESM with network management.

The "SIMATIC NET Industrial Twisted Pair and Fiber Optic Networks" manual /2/ contains further information if you want to connect the OSM/ESM to other SIMATIC NET network components (for example OLM, ELM) or if you want to connect entire network segments to an OSM/ESM.

The "Triaxial Networks for Industrial Ethernet" manual /3/ contains instructions on creating triaxial networks that you can connect via an ELM to an OSM/ESM.

Finding Information

To help you to find the information you require more quickly, the manual includes not only the table of contents but also the following sections in the Appendix:

• Glossary

• Index

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Guide to the Manual

To help you to find specific information quickly, these operating instructions include the following parts:

• At the front of the operating instructions you will find a complete table of contents.

• The chapters have headings in the left margin with an overview of the contents of the paragraphs in the section.

• Following the appendix, you will find a Glossary in which the most important specialist terms used in the instructions are defined.

• At the back of the operating instructions, you will find an index with which you can find topics quickly.

Audience

Preface

These Operating Instructions are intended for staff involved in configuration, commissioning, and troubleshooting networks with Industrial Ethernet OSMs (Optical Switch Module) and Industrial Ethernet ESMs (Electrical Switch Module).

Personnel Qualification Requirements

Only qualified personnel should be allowed to install and work on this equipment. Qualified personnel as referred to in the operating instructions or in the warning notes are defined as persons who are familiar with the installation, assembly, startup and operation of this product and who possess the relevant qualifications for their work, e.g.:

• Training in or authorization for connecting up, grounding or labeling circuits and devices or systems in accordance with current standards in safety technology;

• Training in or authorization for the maintenance and use of suitable safety equipment in accordance with current standards in safety technology;

• First Aid qualification.

Standards and Approvals

The OSM /ESM meets the requirements for the CE mark. You will find detailed information on the existing approvals and certifications in the Appendix in this manual.

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

1 Introduction..................................................................................................................... 6

1.1 Overview of the Variants of the OSM/ESM ......................................................... 7

1.1.1 OSM ITP62 .......................................................................................................... 7

1.1.2 OSM ITP62-LD .................................................................................................... 9

1.1.3 OSM ITP53 ........................................................................................................ 11

1.1.4 ESM ITP80 ........................................................................................................ 13

1.1.5 OSM TP62 ......................................................................................................... 15

1.1.6 ESM TP80 ......................................................................................................... 17

1.1.7 OSM BC08......................................................................................................... 19

1.1.8 OSM TP22 ......................................................................................................... 21

1.1.9 ESM TP40 ......................................................................................................... 23

2 Functions ......................................................................................................................25

3 Network Topologies with OSM/ESM........................................................................... 28

3.1 Bus Structure ..................................................................................................... 29

3.2 Redundant Ring Structure ................................................................................. 31

3.3 Redundant Coupling of Network Segments ...................................................... 33

3.4 Compatibility of OSM Version 2/ESM with OSM/ORM Version 1 ..................... 37

3.5 Coupling Network Segments ............................................................................. 41

4 Interfaces, Displays and Operator Controls .............................................................. 43

4.1 ITP/TP Ports ...................................................................................................... 44

4.1.1 ITP Ports............................................................................................................ 44

4.1.2 TP Ports............................................................................................................. 44

4.1.3 Properties of the TP/ITP Ports........................................................................... 45

4.1.4 FO Ports ............................................................................................................ 47

4.1.5 Standby-Sync Port............................................................................................. 48

4.1.6 Serial Interface................................................................................................... 49

4.1.7 Signaling Contact/Terminal Block for Attaching the Power Supply................... 50

4.1.8 Digital Inputs ...................................................................................................... 53

4.2 Displays and Operator Controls ........................................................................ 54

4.2.1 LED Display "Status" ......................................................................................... 54

4.2.2 LED "Power" ...................................................................................................... 56

4.2.3 Port LEDs .......................................................................................................... 58

4.2.4 Operator Controls .............................................................................................. 60

5 Installation, Commissioning, Cleaning and Maintenance........................................ 62

5.1 Unpacking, Checking the Consignment ............................................................ 63

5.2 Installation.......................................................................................................... 64

5.3 Cleaning............................................................................................................. 71

5.4 Maintenance ...................................................................................................... 72

6 Firmware Update .......................................................................................................... 73

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

7 Technical Specifications ............................................................................................. 78

8 Standards and Approvals............................................................................................ 84

9 Glossary ........................................................................................................................ 88

10 References ....................................................................................................................91

11 Index ........................................................................................................................... 93

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

The switching technology of the Industrial Ethernet OSM Version 2/ESM (Optical/Electrical Switching Module) allows the structuring of Ethernet networks with large spans and large numbers of nodes. It simplifies network configuration and network expansions. The OSM Version 2/ESM are simply called OSM/ESM in the rest of this manual.

The OSMs have both electrical ports and additional FO ports via which several of these devices can be interconnected to form an optical bus or ring configuration. ESMs only have electrical ports.

DTEs, other OSMs/ESMs or complete network segments operating at 10 or 100 Mbps can be connected to the electrical autonegotiation (autosensing) ports of the OSM/ESM. The transmission rate is detected automatically.

To increase availability, ring configurations can be created with OSMs or ESMs. To do this, OSMs or ESMs are first connected together to form a bus using their ring ports. The ends of the bus are closed to form a ring by an OSM or ESM operating in the Redundancy Manager mode (RM mode).

The OSM or ESM operating in the RM mode monitors the attached bus and allows a connection through it if it detects an interruption on the attached bus; in other words, it reestablishes a function bus. Reconfiguration is completed within 0.3s. An OSM/ESM is switched over to the RM mode using a DIP switch on the device.

The redundant standby coupling allows the redundant coupling of OSM/ESM or OLM rings. To do this, two OSM/ESMs (one operating in standby mode) are connected via their standby-sync ports.

With the ITP variants of the OSM/ESM, the DTEs are connected using sub-D female connectors. This connector technology allows direct links over distances up to 100 m. With the TP variants, the DTEs are connected using RJ-45 jacks.

The Version 2 OSMs are compatible with the previous OSM variants (6GK 11050AA00) and ORM (6GK1105-1AA00) and can, for example, be mixed with these in an optical ring.

This manual describes the functions of the OSM/ESM available without using network management. The OSM/ESM Network Management user manual /1/ describes the additional options available if you use network management. You will find this manual on the CD accompanying every OSM/ESM or you can download the manual from the Web in Siemens Customer Support under entry number 8677203:

http://www4.ad.siemens.de/view/cs/de/8677203

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1.1 Overview of the Variants of the OSM/ESM

1.1.1 OSM ITP62

Possible Attachments

The OSM ITP62 allows attachment of up to 6 DTEs or network segments using the ITP connector. By coupling an OSM via ports 7 and 8 it is possible to create optical bus and ring structures. The OSM TP62 can be coupled with other OSM TP62, OSM TP22, OSM ITP53, OSM ITP62, and OSM BC08 modules via the optical ports.

The OSM ITP62 also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the OSM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 1: OSM ITP62

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the OSM ITP62

Electrical ports 6 x 10/100 Mbps

autonegotiation/autocrossover ports

ITP connectors (sub-D 9-pin female)

Optical ports 2 x 100 Mbps FO ports (full duplex)

BFOC female connectors

Maximum distance between two OSMs 3000 m (multimode graded-index fiber)

Maximum ring span with 50 OSMs 150 km

Digital Inputs 8 x DC 24V

Note

Industrial Ethernet OSM ITP62 is available in two versions:

• OSM ITP62 with eight digital inputs:

The eight digital inputs are connected over two plug-in 6-pin terminal blocks on the top of the device. To display the status of these inputs using the eight device LEDs, there is an additional display mode known as the "Input Status" that is selected using a third mode LED.

• OSM ITP62 without digital inputs:

There are no digital inputs and the "Input Status" display mode is not available. The operating states are displayed by two mode LEDs.

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1.1.2 OSM ITP62-LD

Possible Attachments

The OSM ITP62-LD allows attachment of up to six DTEs or network segments using the ITP connector. By coupling an other OSM ITP62-LD modules via ports 7 and 8 it is possible to create optical bus and ring structures.

The OSM ITP62-LD also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the OSM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 2: OSM ITP62-LD

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the OSM ITP62-LD

Electrical ports 6 x 10/100 Mbps

autonegotiation/autocrossover ports

ITP connectors (sub-D 9-pin female)

Optical ports 2 x 100 Mbps FO ports (full duplex)

BFOC female connectors

Maximum distance between two OSMs 26 km (monomode fiber)

Maximum ring span with 50 OSM

1300 km

ITP62-LD

Digital Inputs 8 x DC 24V

Note

Industrial Ethernet OSM ITP62-LD is available in two versions:

• OSM ITP62-LD with eight digital inputs:

• OSM ITP62-LD without digital inputs:

There are no digital inputs and the "Input Status" display mode is not available. The operating states are displayed by two mode LEDs.

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1.1.3 OSM ITP53

Possible Attachments

The OSM ITP53 allows attachment of up to five DTEs or network segments using the ITP connector. By coupling an OSM via ports 7 and 8 it is possible to create optical bus and ring structures. The OSM TP53 can be coupled with other OSM TP53, OSM TP62, OSM ITP22, OSM ITP62, and OSM BC08 modules via the optical ports.

The additional FO port of the OSM ITP53 (port 1) also allows redundant coupling of rings via fiber-optic cable (see Section 3.3).

The OSM ITP53 also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the OSM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 3: OSM ITP53

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the OSM ITP53

Electrical ports 5 x 10/100 Mbps

autonegotiation/autocrossover ports

ITP connectors (sub-D 9-pin female)

Optical ports 3 x 100 Mbps FO ports (full duplex)

BFOC female connectors

Maximum distance between two OSMs 3000 m

Maximum ring span with 50 OSMs 150 km

Digital Inputs 8 x DC 24V

Note

Industrial Ethernet OSM ITP53 is available in two versions:

• OSM ITP53 with eight digital inputs:

• OSM ITP53 without digital inputs:

There are no digital inputs and the "Input Status" display mode is not available. The operating states are displayed by two mode LEDs.

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1.1.4 ESM ITP80

Possible Attachments

The ESM ITP80 allows attachment of up to eight DTEs or network segments with ITP connectors (sub-D9 female). By coupling further ESMs to ports 7 and 8 it is possible to create optical bus and ring structures.

The ESM ITP80 also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the ESM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 4: ESM ITP80

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the ESM ITP80

Electrical ports 8 x 10/100 Mbps

autonegotiation/autocrossover ports

ITP connectors (sub-D 9-pin female)

Maximum distance between two ESMs 100 m

Maximum ring span with 50 ESMs 5 km

Digital Inputs 8 x DC 24V

Note

Industrial Ethernet OSM ITP80 is available in two versions:

• ESM ITP80 with eight digital inputs:

• ESM ITP80 without digital inputs:

There are no digital inputs and the "Input Status" display mode is not available. The operating states are displayed by two mode LEDs.

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1.1.5 OSM TP62

Possible Attachments

The OSM TP62 allows attachment of up to 6 DTEs or network segments with TP connectors. By coupling an OSM via ports 7 and 8 it is possible to create optical bus and ring structures. The OSM TP62 can be linked with other OSM TP62, OSM TP22, OSM ITP53, OSM ITP62, and OSM BC08 modules via the optical ports.

The OSM TP62 also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the OSM. The use of this function is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 5: OSM TP62

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the OSM TP62

Electrical ports 6 x 10/100 Mbps

autonegotiation/autocrossover ports

TP connectors (RJ-45 jacks)

Optical ports 2 x 100 Mbps FO ports (full duplex)

BFOC sockets

Maximum distance between two ESMs 3000 m (multimode graded-index fiber)

Maximum ring span with 50 OSMs 150 km

Digital Inputs 8 x 24 V dc

Note

Industrial Ethernet OSM TP62 is available in two versions:

• OSM TP62 with eight digital inputs:

The eight digital inputs are connected over two plug-in 6-pin terminal blocks on the top of the device. To display the status of these inputs using the 8 device LEDs, there is an additional display mode known as the "Input Status" that is selected using a third mode LED.

• OSM TP62 without digital inputs:

There are no digital inputs and the "Input Status" display mode is not available. The operating states are displayed by 2 mode LEDs.

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1.1.6 ESM TP80

Possible Attachments

The ESM TP80 allows attachment of up to 8 DTEs or network segments with TP connectors (RJ-45 jack). By linking further ESMs to ports 7 and 8 of the ESM TP80 it is possible to create bus and ring structures.

The ESM TP80 also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the ESM. The use of this function is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 6: ESM TP80

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the ESM TP80

Electrical ports 8 x 10/100 Mbps autonegotiation ports

TP connectors (RJ-45 jacks)

Optical ports none

Maximum distance between two ESM

100 m

TP80 modules

Maximum ring span with 50 ESM TP80

5 km

modules

Digital Inputs 8 x DC 24V

Note

Industrial Ethernet OSM TP80 is available in two versions:

• ESM TP80 with eight digital inputs:

• ESM TP80 without digital inputs:

There are no digital inputs and the "Input Status" display mode is not available. The operating states are displayed by 2 mode LEDs.

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1.1.7 OSM BC08

Possible Attachments

The OSM BC08 allows you to connect up to 8 DTEs or network components over FO ports and is suitable particularly in environments in which the data lines run through areas with high levels of electromagnetic interference (for example, in the vicinity of power supply cables).

The OSM BC08 can be coupled with other OSM BC08, OSM ITP62, OSM TP62, OSM TP22, and OSM ITP53 over the optical ports 7 and 8 to form a redundant fiber-optic ring, a fiber-optic star, or a fiber-optic linear bus.

The OSM BC08 also has eight digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the OSM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 7: OSM BC08

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the OSM BC08

Ports 8 x 100 Mbps FO ports (full duplex)

BFOC female connectors

Maximum distance between two OSMs 3000 m (multimode graded-index fiber)

Maximum ring span with 50 OSMs 150 km

Digital Inputs 8 x DC 24V

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1.1.8 OSM TP22

Possible Attachments

The OSM TP22 allows attachment of up to 2 DTEs or network segments with TP connectors. By coupling an OSM via ports 3 and 4 it is possible to create optical bus and ring structures. The OSM TP22 can be coupled with other OSM TP22, OSM TP62, OSM ITP53, OSM ITP62, and OSM BC08 modules via the optical ports.

The OSM TP22 also has four digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the OSM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 8: OSM TP22

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the OSM TP22

Electrical ports 2 x 10/100 Mbps

autonegotiation/autocrossover ports

with TP connectors (RJ-45 jacks)

Optical ports 2 x 100 Mbps FO ports (full duplex)

BFOC female connectors

Maximum distance between two OSMs 3000 m (multimode graded-index fiber)

Maximum ring span with 50 OSMs 150 km

Digital Inputs 4 x DC 24V

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1.1.9 ESM TP40

Possible Attachments

The ESM TP40 allows attachment of up to 4 DTEs or network segments with TP connectors (RJ-45 jack). By coupling further ESMs via ports 3 and 4 it is possible to create bus and ring structures.

The ESM TP40 also has four digital inputs. The states of the inputs are available in a management information base (MIB) and can be read using an SNMP get request. Depending on the configuration of the device, changes at these inputs can also trigger the sending of E-mails, SNMP traps and/or entries in the log of the ESM. The use of these functions is described in the OSM/ESM Network Management User Manual /1/.

Introduction

Figure 9: ESM TP40

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Introduction

Properties of the ESM TP40

Ports 4 x 10/100 Mbps

autonegotiation/autocrossover ports

with TP connectors (RJ-45 jacks)

Maximum distance between two ESMs 100 m

Maximum ring span with 50 ESMs 5 km

Digital Inputs 4 x DC 24V

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Functions

This chapter discusses the general functions of the OSM/ESM, in particular the properties of the switching technology.

Increased Network Performance

By filtering the data traffic based on the Ethernet (MAC) address of the DTEs, local data traffic remains local, only data intended for nodes in another network segment are passed on by the OSM or ESM. This reduces the data traffic in the network segments and lowers the network load in the network segments.

Functions

Simple Network Configuration and Network Expansion

OSMs and ESMs store the data received at the ports and the direct it to the destination address. The restriction of the network span resulting from collision detection (CSMA/CD) ends at the OSM/ESM port. With multimode graded-index fibers, a total network span of up to 150 km and more can be achieved without problems. With the OSM ITP62-LD, the monomode fibers allow a network span of up to 1300 km.

Limitation of Errors to the Network Segment Affected

OSMs and ESMs only pass on valid data. Invalid packets are discarded so that bad packets within a network segment have no effect on any other segment attached to the OSM/ESM.

Learning Addresses

By evaluating the source addresses in the data packets, OSMs/ESMs automatically learn the addresses of the DTEs attached via a particular port. If an OSM/ESM receives a data packet, it directs this packet only to the port via which the appropriate DTE can be obtained.

An OSM/ESM can learn up to 7000 addresses.

Industrial Ethernet OSM/ESM C79000-Z8976-C068-10

Functions

Deleting Addresses

An OSM/ESM monitors the age of the addresses it has learnt - address entries that exceed a certain age (aging time, default setting on the OSM/ESM 40 seconds) are deleted again by the OSM/ESM. If a packet with a source address matching the address entry is received before the aging time elapses, the address entry is retained and the age of the address is set to 0 again. When the OSM/ESM is restarted, the address entries are also deleted. If a packet is received by an OSM/ESM for which there is no address entry, the OSM/ESM distributes it to all ports.

Setting the Transmission Rate, Autonegotiation

The electrical ports of the OSM/ESM are set to autonegotiation mode as default (autosensing).

They automatically detect the transmission rate (10 or 100 Mbps) at which the attached device or attached network segment operates and set themselves to this rate. If the partner device also supports the autonegotiation mode, the devices further negotiate whether they will exchange data with each other in the half duplex or full duplex mode.

As a result of the automatic adaptation to the transmission rate of the attached DTEs, existing network segments operating at 10 or 100 Mbps can be interconnected simply using OSMs/ESMs.

Note

If the partner device connected to a port of an OSM/ESM does not support the autonegotiation mode (for example OSM Version 1), the port of the partner device must be set to half duplex mode or the port properties of the OSM/ESM must be configured.

Packets with the VLAN Priority Tag

OSMs/ESMs support frames with VLAN tags according to IEEE 802.1Q.

VLAN tags are additional information entered in the frame header. This additional information includes a priority field according to IEEE 802.1D. This field can have values from 0 through 7 and allows frames to be assigned a priority from 0 (lowest priority) through 7 (highest priority).

Frames with priority 0 through 3 are processed with low priority in the OSMs/ESMs and frames with priority 4 through 7 are processed with high priority. Frames with a non-learned unicast destination address are an exception. These are always handled with low priority.

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