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sPreface, ContentsSIMATICBasics of the SNMP OPC server1PCS 7 Integration of the SNMPOPC Server2Configuring the SNMP OPCServer in the PCS 7 Environment3Process Control System PCS 7 Settings on a Switch Based onNetwork Diagnostics with the the Example of an OSM / ESMSNMP OPC ServerFunction ManualDiagnostics and Test Support5Important SNMP Variables6Glossary, IndexEdition 04/2004C79000-G8976-C1954

Safety GuidelinesThis manual contains notices intended to ensure personal safety, as well as to protect the products andconnected equipment against damage. These notices are highlighted by the symbols shown below andgraded according to severity by the following texts:!Danger!Warning!Cautionindicates that death, severe personal injury or substantial property damage will result if properprecautions are not taken.indicates that death, severe personal injury or substantial property damage can result if properprecautions are not taken.indicates that minor personal injury can result if proper precautions are not taken.Cautionindicates that property damage can result if proper precautions are not taken.Noticedraws your attention to particularly important information on the product, handling the product, or to aparticular part of the documentation.Qualified PersonnelOnly qualified personnel should be allowed to install and work on this equipment. Qualified personsare defined as persons who are authorized to commission, to ground and to tag circuits, equipment, andsystems in accordance with established safety practices and standards.Correct UsageNote the following:!WarningThis device and its components may only be used for the applications described in the catalog or thetechnical description, and only in connection with devices or components from other manufacturerswhich have been approved or recommended by Siemens.This product can only function correctly and safely if it is transported, stored, set up, and installedcorrectly, and operated and maintained as recommended.TrademarksSIMATIC , SIMATIC HMI and SIMATIC NET are registered trademarks of SIEMENS AG.Third parties using for their own purposes any other names in this document which refer to trademarksmight infringe upon the rights of the trademark owners.Copyright Siemens AG 2004 All rights reservedDisclaimer of LiabilityThe reproduction, transmission or use of this document or itscontents is not permitted without express written authority.Offenders will be liable for damages. All rights, including rightscreated by patent grant or registration of a utility model or design,are reserved.We have checked the contents of this manual for agreement withthe hardware and software described. Since deviations cannot beprecluded entirely, we cannot guarantee full agreement. However,the data in this manual are reviewed regularly and any necessarycorrections included in subsequent editions. Suggestions forimprovement are welcomed.Siemens AGBereich Automation and DrivesGeschaeftsgebiet Industrial Automation SystemsPostfach 4848, D- 90327 Nuernberg Siemens AG 2004Technical data subject to change.Siemens AktiengesellschaftC79000-G8976-C195

PrefacePurpose of the ManualThis manual informs you of the basic functions and most important configurationswhen using the SNMP OPC server with the process control system SIMATICPCS 7. The necessary steps in configuration in all required modules of the processcontrol system PCS 7 are introduced. You should pay particular attention to theconditions that relate specifically to PCS 7 in Chapter 2.If information relates directly to handling individual components, we will refer you tothe manuals of the products where you will find more detailed information.Required ExperienceTo understand the manual, you require a working knowledge of automationengineering and should be familiar with the basics of PCS 7. You also requireknowledge of working with computers or PC-type tools (for example programmingdevices) with the Windows 2000 operating system.The basics of working with PCS 7 are explained in the Configuration Manual and inGetting Started.Validity of the ManualThe manual is valid for the software package SIMATIC PCS 7 V6.0.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195iii

PrefaceFurther Documentation and Sources of InformationYou will find further information on the topics of OPC and SNMP and on workingwith the individual components in the following documentation and in the WinCCInformation System. The Manual CD "Process Control System PCS 7 V6.0,Electronic Manuals also contains detailed information.ManualContentGetting Started Process ControlSystem PCS 7;Part 1 - NewcomersPart 1:Creating ProjectsWorking with the CFC EditorWorking with the Import/Export AssistantWorking with the SFC EditorCompiling, Downloading and TestingWorking with the Operator StationConfiguration Manual ProcessControl System PCS 7;Engineering SystemBasics of PCS 7Creating ProjectsConfiguring HardwareConfiguring NetworksConfiguration Manual ProcessControl System PCS 7; OperatorStation.Configuring SIMATIC ConnectionsInterconnecting OS BlocksConfiguring an Operator StationCompiling an OSInstallation GuidelinesConfiguration Manual WinCCGetting StartedHow WinCC Redundancy WorksUser ArchivesCreating a Sample Project "Project Redundancy Server"Description of WinCC ProjectsServer ProjectManual WinCC Hardware Options,Part 3 RedundancyStructure of a Redundant WinCC SystemHow WinCC Redundancy WorksConfiguring the OS Server PairGuidelines for Setting Up a Redundant SystemEntering the Servers in Windows 2000Manual SIMATIC NETCommissioning PC Stations- Instructions and Quick StartSIMATIC PC – Configuring StationsSIMATIC NET Industrial EthernetOSM/ESM Network ManagementUser ManualOSM/ESM FunctionsivConfiguring the OPC ServerSNMP Communication with OPCWeb Based ManagementProcess Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

PrefaceGuide to the ManualThis manual is divided into the following topics. Chapter 1 explains the basics of the SNMP OPC server. Chapter 2 describes the integration of the SNMP OPC servers in PCS 7. Chapter 3 describes the configurations of the various components of the SNMPOPC server in PCS 7. Chapters 4 and 5 provide you with examples of settings on an OSM/ESM andfor testing and diagnostics. Chapter 6 lists the most commonly required Variables of the OSM/ESM family. The glossary contains terminology important for understanding thisdocumentation. The index helps you to locate text passages with important key words.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195v

PrefaceFurther SupportIf you have questions about the use of the products described in the manual, andyou cannot find the answers here, please contact your Siemens representative inyour local Siemens office.You will find your contact person ng CenterTo familiarize you with the Process Control System SIMATIC PCS 7 and the S7programmable controllers, we offer a range of courses. Please contact yourregional training center or the main training center in D 90327 Nuremberg.viPhone: 49 (911) 895-3200.Internet:http://www.sitrain.comProcess Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

PrefaceA&D Technical SupportAvailable at all times worldwide:NuernbergBeijingPekingJohnson CityWorldwide (Nuernberg)Technical Support24 hours a day, 365 days a yearPhone: 49 (180) 5050-222Fax: 49 (180) 5050-223E-Mail:[email protected]: 1:00Europe / Africa (Nuernberg)United States (Johnson City)Asia / Australia (Beijing)AuthorizationTechnical Support andAuthorizationTechnical Support andAuthorizationLocal time: Mon.-Fri. 8:00 to 5:00 PMLocal time: Mon.-Fri. 8:00 to 5:00 PMLocal time: Mon.-Fri. 8:00 to 5:00 PMPhone: 49 (180) 5050-222Phone: 1 (423) 262 2522Phone: 86 10 64 75 75 75Fax: 49 (180) 5050-223Fax: 1 (423) 262 2289Fax: 86 10 64 74 74 [email protected]:[email protected]: 1:00GMT:-5:00GMT: 8:00sea.siemens.comsiemens.comThe languages of the SIMATIC Hotlines and the authorization hotline are generally German and English.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195vii

PrefaceService & Support on the InternetIn addition to our documentation services, you can also make use of all ourknowledge on the Internet.www.siemens.de/snmp-opc-serverHere, you will find: The Newsletter that keeps you constantly up to date with the latest informationon the products you use. The documents you need using our Search engine in Service & Support. Examples and applications, in particular a complete WinCC example. A forum in which users and specialists exchange worldwide experience. Your local representative for Automation & Drives. Information on on-site service, repair and spares. You will find far more in"Services".viiiProcess Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

Contents1Basics of the SNMP OPC Server1.11.223Motivation for the Use of the SNMP OPC Server .1-1Functional Description of the SNMP OPC Server .1-3PCS 7 Integration of the SNMP OPC Server2.12.22.32-1Runtime Model .2-1Configuring .2-3Settings of the OS Server in the PCS 7 Environment.2-4Configuring the SNMP OPC Server in the PCS 7 Environment3.13.21-13-1HW Config Configuring in the PCS 7 Project.3-1WinCC Configuration .3-84Settings on a Switch Based on the Example of an OSM / ESM4-15Diagnostics and Test Support5-16Important SNMP Variables6-16.16.2MIB II Standard Variables .6-1Other Variables of the OSM/ESM Family .6-5GlossaryIndexProcess Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195ix

ContentsxProcess Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

1Basics of the SNMP OPC Server1.1Motivation for the Use of the SNMP OPC ServerThe SNMP OPC server makes data available for the diagnostics of TCP/IPnetworks.Errors and faults and even the failure of the Ethernet plant network can be detectedearly and downtimes reduced or even prevented.This increases the reliability and improves the availability of your plant.SNMP (Simple Network Management Protocol) is a protocol specially designed toadminister TCP/IP networks and has been used for years in the IT world fordiagnostics in TCP/IP networks. Switches such as the OSM/ESM also supportSNMP. The network components and/or DTEs in Ethernet make their statusavailable with the SNMP OPC server.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1951-1

Basics of the SNMP OPC ServerApart from detailed diagnostics of SNMP-enabled devices, simple statusmonitoring of IP devices can be integrated into your plant concept. This means thatin addition to the existing system and process diagnostics, diagnostics of thecomplete IP network infrastructure can be integrated.The visualization of this information (represented as information in topologicaland/or table form) can be individually designed and adapted to the particularrequirements of the customer plant.Apart from simple device diagnostics, detailed information such as the statusmonitoring of redundant network structures (for example, an OSM ring) or port loadcan be indicated depending on the user's requirements.More detailed information (for example application samples, FAQs and whitepaper) is available from the following Web site www.siemens.de/snmp-opc-server1-2Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

Basics of the SNMP OPC Server1.2Functional Description of the SNMP OPC ServerUsing the SNMP OPC server, SNMP-enabled network components and IP devicessuch as the SIMATIC NET OSM / ESM can also be monitored in plants. The SNMPOPC server adopts the role of translator of SNMP on the OPC interface of yourPCS 7 application. The device information can be read and to some extent alsowritten. This allows diagnostics of individual devices and even the completenetwork infrastructure as well as the control (only with write access) of deviceproperties.The SNMP OPC server also includes a MIB compiler with which other SNMPenabled devices can be integrated at a later time. Using the MIB compiler, existingdevice profiles can be adapted and new device profiles created.A device profile describes the range of variables of a device, for example OSM,that can be mapped on the OPC server. Only variables included in the deviceprofile can be integrated in your application.SIMATIC devices that have special SNMP agents, such as switches (OSM, ESM,ELS) and Industrial Ethernet communications processors CP 1613 and the CPs343-1 /443-1 are already included with their device profiles. Devices with an IPaddress but without an SNMP agent can be monitored using the ping mechanism.The user can add device information such as a contact person, location and devicedescription.All SNMP-enabled devices provide a certain range of standardized and partlydevice-specific variables (see Section 6) by means of an SNMP agent. The dataexchange between an SNMP client, for example the SNMP OPC server, and itsassigned agents (for example OSM) generally takes place within a certain cycle.The range of variables and the cycle time is generally specified in the configuration.The agents do, however, have the capability of reporting certain events such as thefailure of a port to the SNMP OPC server unsolicited using an SNMP trap.Cyclically queried SNMP variables are accessible to the OPC client application (forexample PCS 7) over the OPC and Data Access interface. Acyclic data of thenetwork components resulting from SNMP traps are mapped both on the DataAccess and on the OPC Event interface. OPC client applications that do not yetsupport the "Alarms and Events" OPC Standard can therefore also evaluate SNMPtraps.NoteThe use of SNMP traps or OPC events is optional. Generally, the informationtransferred with traps is polled using SNMP get requests. As default, WinCC makesOPC Data Access available for this.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1951-3

Basics of the SNMP OPC Server1-4Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

2PCS 7 Integration of the SNMP OPC ServerThe following information relates to OSM/ESM since these are the only devicescurrently released for PCS 7 V6.0 SP3.2.1Runtime ModelThe SNMP OPC server runs on an OS server. The SNMP interface is the interfaceto the network. This is included in the standard components of Windows 2000. Ifyou only use OPC Data Access, no additional operating system functionality needsto be installed.The following schematic shows the configuration of the SNMP OPC server on oneor more OS erOSServerOPCServerOSMTerminal busTCP/IPOSServerOSMOSMOSMd igit aPlant busISO TCP/IPlASd igita lASCommunication with the SNMP-enabled devices is over IP and Ethernet. Thismeans that the devices must also be reachable over IP. This can be checkedquickly, for example with a "ping" from the server.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1952-1

PCS 7 Integration of the SNMP OPC ServerThe SNMP-enabled devices such as the OSM/ESM must be assigned an IPaddress to use SNMP. This is possible with all devices using the followingmechanisms: RS-232 terminal BOOTPand as of firmware version 2.3.0 also with DHCP server PST Tool (see download www4.ad.siemens.de/view/cs/en/14929629) STEP7/NCM PCWhen using the SNMP OPC server, make sure that the IP address configured inPCS 7 and the existing online IP address match.NoteTo monitor the Ethernet switches OSM/ESM, the OS server on which the SNMPOPC server runs must be capable of TCP/IP not only on the terminal bus but alsoon the plant bus. Since the ISO protocol is used for communication on the networkadapter (for example CP 1613) of the plant bus in PCS 7 plants, a separate networkadapter must be planned on the OS for communication over the TCP/IP protocol onthe plant bus to avoid mixed operation of the network protocols on one adapter.In total, the OS server therefore requires three network adapters: Apart from thenetwork adapter for the plant bus (for example a CP 1613), a network adapter forTCP/IP communication on the terminal bus and a network adapter for monitoringthe OSM/ESM on the plant bus must be installed.The interface of the SNMP OPC server to PCS 7 is the OPC client channel of theWinCC data manager. The SNMP variables are therefore maintained in the datamanagement of the data manager and can be further processed with WinCC tools.2-2Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

PCS 7 Integration of the SNMP OPC Server2.2ConfiguringTo use the SNMP OPC server in the PCS 7 runtime environment described above,it must be configured in terms of the network configuration, device profile, andWinCC integration in the engineering phase:Initially, the IP addresses of the SNMP-enabled devices must be configured for theSNMP OPC server with STEP7/NCM PC and the appropriate profile selected. Thedevice profile that describes the range of SNMP variables already exists for theOSM/ESM in the configuration. There is exactly one entry for each SNMP-enabled device (for exampleOSM/ESM) in the properties dialog of the configuration of the SNMP OPCserver. The configured IP addresses must match those of the devices (seeChapter 4). A device profile is a table of variables that can, when necessary, be modifiedwith a MIB compiler or created individually for other devices.The variables specified by means of the profile are available in the OPC clientapplication. Here, the required variables are included in the data managementWinCC in a further step. For each OPC item to be monitored, the user creates avariable in the WinCC tag manager and, if required, creates control systemmessages in WinCC Alarm Logging.For further details of configuring the SNMP OPC server, refer to Chapter 3,Configuring the SNMP OPC Server in PCS 7.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1952-3

PCS 7 Integration of the SNMP OPC Server2.3Settings of the OS Server in the PCS 7 EnvironmentTo be able to operate the OS server as an additional SNMP OPC server correctlyin the PCS 7 environment, special settings are necessary compared with theconfiguration in the simple SIMATIC NET environment:Since the ISO protocol is used for communication on the network adapter (forexample CP 1613) of the plant bus in PCS 7 plants, a separate network adaptermust be planned on the OS for communication over the TCP/IP protocol on theplant bus to avoid mixed operation of the network protocols on one adapter. As aresult, a different TCP/IP network identifier must be set on the TCP/IP adapter ofthe terminal bus compared with that on the TCP/IP adapter of the plant bus toavoid address space overlaps on both TCP/IP adapters (for example 192.11.81.xxxon the terminal bus and 142.11.81.xxx on the plant bus). After installing anadditional network adapter for communication between the SNMP OPC server andthe OSMs/ESMs connected to the plant bus, the following network settings must bemade on the OS server:StepProcedure1First activate the network connection:2-4Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

PCS 7 Integration of the SNMP OPC ServerStepProcedure2Set the protocols. Deactivate all protocols and services except for the TCP/IP protocol:3Set the IP address:Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1952-5

PCS 7 Integration of the SNMP OPC ServerStepProcedure4In the "Advanced - Advanced Settings" menu in the Network and Dial-up Connectionsdialog, set the bindings: The network connection for the terminal bus must be first in thelist to avoid communication problems between server and clients in runtime mode. No"Client for Microsoft Networks" must be set:2-6Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

3Configuring the SNMP OPC Server in thePCS 7 EnvironmentThe following section describes the configuration of the SNMP OPC server in thePCS 7 environment in greater detail, based on an example. The configuration workis done on an engineering station (ES).3.1HW Config Configuring in the PCS 7 ProjectTo operate an SNMP OPC server on an OS server, the SIMATIC PC station of theOS server must be configured in the PCS 7 project. Select an empty row in thehardware configuration of the SIMATIC PC station and add the OPC server. Youwill find the OPC server in the "Standard" profile under "SIMATIC PC Station –OPC Server – SW V6.1.":Editing the Hardware Configuration:To configure the OPC server, double-click on the "OPC Server" row. Theproperties dialog of the OPC server opens. Select the "SNMP" tab. The followingpage is displayed:Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1953-1

Configuring the SNMP OPC Server in the PCS 7 EnvironmentEditing Properties of the OPC Server:If necessary, the cycle time can be changed in the first box. The cycle timespecifies the minimum time in which the variables of the SNMP OPC server can bepolled. With the "Access Protection" option, variable access can be controlled(read, write).NoteThe cycle time specifies the interval at which the variables of the SNMP OPC serverare polled. To achieve good general performance in the PCS 7 project, this timeshould not be selected unnecessarily shorter than the update time of the SNMPvariables configured on the OS. In general, the value "1000 ms" should be suitablefor most situations.If you click on "Edit plant configuration .", the SNMP-enabled devices to bemonitored are inserted and configured. The following screen appears:3-2Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

Configuring the SNMP OPC Server in the PCS 7 EnvironmentEditing the Plant Configuration:Here, all the devices are made known to the SNMP OPC server.(In this example, several entries have already been configured.)By clicking on "Add.", a new node is added to the plant configuration. A newdialog "Edit nodes" opens with default parameters.By clicking on "Delete", the currently selected node is deleted from the plantconfiguration.If you click on "Edit.", you can modify the parameters of the currently selectednode. A new dialog "Edit nodes" opens with the current parameters.As supplied today, the use of the SNMP OPC server on OSMs/ESMs is restricted.The "Import Nodes" function is therefore currently not relevant and is reserved for alater version in which the node list will be extended by all the devices in the currentproject that have their own IP address.If the device supports Web Based Management, clicking on "Web basedManagement ." opens the Internet Explorer with the corresponding URL.For more detailed information on Web Based Management of the OSM/ESM, referto the OSM / ESM documentation. (SIMATIC NET Industrial Ethernet OSM/ESMNetwork Management User Manual).The "Edit nodes" dialog appears after you click on "Add." or "Edit.".Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1953-3

Configuring the SNMP OPC Server in the PCS 7 EnvironmentEdit Nodes:In this dialog box, you edit the following entries: Name:Enter a node name (for example Test OSM 1) to identify the node uniquelythroughout the entire PCS 7 project. IP address:Enter the IP address of the device here. Device profile:Select a device profile. The device profile describes the mapping of SNMPvariables and traps on the OPC interface. With the "Create Profile." button,you can create your own profile from MIB files. The "Profil OSM V10.txt" profileis recommended for this. Community:Enter the "SNMP community" of the device here. This is a type of password withwhich it is possible to access the device (either read-only or read access). Timeout:Here you enter the maximum interval within which it is attempted to read avalue from the Microsoft stack before the quality of the variable is set to "bad"on the OS. Optimization of SNMP accessSelect "Optimization" if you want several objects of the same type to berequested in a frame to reduce network load. Do not select optimization if theagent does not support this functionality. This saves the automatic initial queryand correction when the variable is registered. Comment:Enter any relevant text as the comment.3-4Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

Configuring the SNMP OPC Server in the PCS 7 EnvironmentAll the parameters entered here are stored internally and can be visualized duringruntime.Close the "Edit nodes" dialog by clicking "OK"; you return to editing the plantconfiguration.Close the "Editor Plant Configuration." dialog once you have created/modified allthe nodes by clicking on "OK"; you return to editing the properties of the OPCserver.Close the "Properties – OPC Server" dialog by clicking on "OK"; you return tohardware configuration.Save and compile the SIMATIC PC station.Finally, copy the fully configured OPC server to the SIMATIC PC station of the ESstation:Copying the OPC Server:NoteIf you need to use a redundant system, the partner station should also beconfigured appropriately. To do this, copy the previously configured OPC server tothe partner station. Then save and compile this partner station as well.Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1953-5

Configuring the SNMP OPC Server in the PCS 7 EnvironmentDownloading to the Target System:Download the configuration of modified PC stations to the target computer(s). TheOS server computer and the redundant OS server computer (if it exists) can alsobe downloaded before the actual commissioning of the server:3-6Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

Configuring the SNMP OPC Server in the PCS 7 EnvironmentNoteIn PCS 7 V6.0 SP3, SIMATIC NET CD V6.2 is used. In this case it is necessary torun the Station Configuration Editor and to insert the same applications in the sameway as the PC station including address adaptation for the network adapter in thePCS 7 project:Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1953-7

Configuring the SNMP OPC Server in the PCS 7 Environment3.2WinCC ConfigurationTo visualize the values provided by the SNMP OPC server on an OS server, theWinCC tag management and the alarm system must be suitably configured. Firstopen the OS project in the PCS 7 project (WinCC application):Expanding the WinCC Tag Management:First expand the WinCC tag management with variables from the SNMP OPCserver. Then, when this is complete, configure the pictures and Alarm Logging. Tobe able to create this configuration on the ES computer (required for PCS 7), theSIMATIC PC station of the ES station must also be set up in the PCS 7 project asan SNMP OPC server. This is achieved by copying the OPC server in the PCconfiguration. Then download the configuration to the ES computer (see Section4.1). Only then is it possible to create an OPC connection to the SIMATIC NETOPC server on the local computer, and to insert the required variables into theWinCC tag management using the tag browser.NoteIn a redundant OS server pair, there is only one ("master") OS project that needs tobe edited or configured. This OS project is automatically adapted (computer name,redundancy settings,.) when you download to the redundant target computer.3-8Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C195

Configuring the SNMP OPC Server in the PCS 7 EnvironmentTo expand the WinCC tag management, first insert the OPC channel and the OPCconnection. You can do this by right-clicking on the OPC channel and selecting theproperties:NoteEnter "OPC.SimaticNet" as the OPC server name. Specify only LOCAL as theOPC server to access the local computer later. For a redundant server pair, theactual computer name must not be entered here under any circumstances.Otherwise, later in runtime, the standby server that has no OS project in its ownwould access the master server remotely!Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC79000-G8976-C1953-9

Configuring the SNMP OPC Server in the PCS 7 EnvironmentNow create the variables using the tag browser. You will find a list of suitable orpractical variables belonging to the OSM/ESM family along with a description inChapter 6.Create a variable in the data manager for each OPC item to be monitored. In thecase of the OSM/ESM, the variables "&statepathval()" for connection monitoringand "snOsmFaultState" for fault state monitoring are suitable because errorinformation compression can be used on the device with these variables. In thesimplest situation, create a variable in the data manager manually for eachOSM/ESM in the network:3-10Process Control System PCS 7 Network Diagnostics with the SNMP OPC ServerC

Basics of the SNMP OPC Server Process Control System PCS 7 Network Diagnostics with the SNMP OPC Server C79000-G8976-C195 1-3 1.2 Functional Description of the SNMP OPC Server Using the SNMP OPC server, SNMP-enabled network components and IP devices such as the SIMATIC NET OSM / ESM c