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Siemens NCM S7 appendix Connections, Characteristics of a Connection

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Configuring Communication Connections

4.3Connections

Characteristics of a Connection

A communication connection allows program-controlled communication between two nodes on Industrial Ethernet with the following characteristics:

SThe data transfer is bi-directional, in other words, it is possible to transmit and receive on the connection simultaneously.

SBoth stations have the same rights, in other words, each station can trigger the send and receive procedures in response to events.

SThe address of the communication partner is specified in the configuration. Exceptions to this are:

–free UDP connections

Here, the address is specified at the FC interface in the user program.

–programmed communication connections (see Chapter 5)

SIMATIC S7 station with Ethernet CP

send

receive

send

receive

	Ethernet
	node
Communication	receive
Communication
connection	send
	send

	Ethernet
	node
Communication	receive
Communication
connection	send
	send

Figure 4-2 Sending and Receiving via one Communication Connection

Note

The term “connection” is also used here for UDP. Reason: During configuration (just as in TCP) the communication partners are assigned to each other and therefore logically “connected”. In actual fact, with UDP there is no explicit connection establishment between communication partners.

SIMATIC NET NCM S7 for Industrial Ethernet	91
Release 6/2003

C79000–G8976–C129–07

Image 91

Siemens NCM S7 appendix Connections, Characteristics of a Connection

Contents

For NCM S7 V5.2 and higher Simatic NETClassification of Safety-Related Notices Correct Usage of Hardware Products Safety Instructions Regarding your ProductTrademarks Qualified PersonnelPrior to Startup Primer Communication services with / NCM S7S7-CP and / NCM S7 ManualScope of this Manual AudienceConventions Symbols Used in this ManualManual Title ContentNCM S7 for Industrial EthernetTopic Document Additional Information on Simatic S7 and StepAccess to Online Help of and NCM S7 Contents 145 Contents225 NCM S7 DiagnosticsProgramming FCs Functions and FBs for S7 Ethernet CPs 163 205238 229233 234Communication via Ethernet CPs in S7 Stations All-Round Communication in the Industrial Sector Network AccessIndustrial Ethernet DefinitionTypes of Communication Simatic S7 Communication with S7 Ethernet CPsPG/OP communication Html process control S7 communicationS5-compatible communication with SEND/RECEIVE interface PROFInet communicationPossibilities for Communication between Device Types File management and file access with FTPProgrammed Connections Configuration and DiagnosticsApplication PG/OP Communication via Industrial EthernetWAN IsdnRequirements for PG Communication PG Communication with over Industrial EthernetNetworking the PG / Engineering Station Requirements ProcedureNodes S7 Communication on Industrial EthernetClient and server functionality at both ends Profibus Interface in the User Program of the S7 Station Configuring S7 ConnectionsBlock Type Client Server Described Communication via Ethernet CPs in S7 Stations ISO Transport Connection S5-compatible Communication SEND/RECEIVE InterfaceInterface IP Internet ProtocolWAN StationsCoordinating Access Using the User Program FETCH/WRITE Services ServerConnection Types Tools ConfiguringNetworking Stations with Step Networking in a MultiprojectVariants Variant examples Characteristics/ConfigurationSystem Production Configuration of the SystemNetwork/Project Variant One Subnet One Project View in a ProjectS7-300/1 S7-400/1Network/Project Variant Two or More Subnets One Project Organization in a Multiproject Network/Project Variant One Subnet More Than One SubProjectPossibilities for stations outside the current project Merging Projects in the Multiproject Cell level = subproject Communication via Ethernet CPs in S7 Stations Network/Project Variant Connections between Subnets TCP/IP Page Installing and Starting the Ethernet CP With Step Functions InstallationOperation Configuration data User programs in the Step Project ProcedureUDP Aims Creating an Industrial Ethernet SubnetSelect Insert Subnet Industrial Ethernet Properties of Merged Subnets Multiproject Installing and Starting the Ethernet CP with Step Entering an Ethernet CP in the Hardware Configuration Subnet Attachment Installing and Starting the Ethernet CP with Step Installing and Starting the Ethernet CP with Step Graphic Overview in NetPro Displaying the Network Attachments of a StationResult Overview in Table FormTabs Settings for Setting Further CP PropertiesOverview Options Tab Addresses TabOption Meaning / Effect CPU Default Setting Time-of-Day Synchronization Tab Diagnostics TabAddressing Tab IP Access Protection Tab IP Configuration Tab Dhcp server. It is possible for the user program to instruct Non-Siemens Device Ethernet subnet S7-400/3 Substitute Objects in the ProjectPlant Production S7-400/2Attaching Non-S7 Stations to the Subnet Project With Substitute Objects ConfiguredSelecting the Subnet Type for Other Station Example Setting Up Connections Configuring Communication ServicesAssigning the Address Options and Recommendations Assigning Addresses for the First Time Applies to Latest CPsSelect the menu command PLC Assign Ethernet Address Installing and Starting the Ethernet CP with Step Alternative Procedure Installing and Starting the Ethernet CP with Step Principle Downloading the Configuration Data to the Target SystemType of Interface Saving the Configuration Data in Non-Volatile Memory Deactivating the MAC Address in the ConfigurationDownloading the Configured Connections Relocating the CP in the Hardware Configuration SEND/RECEIVE Interface in the User Program Ethernet CP How the SEND/RECEIVE Interface Works on the CPUFunctions FCs Amounts of DataPrinciple of Job and Data Transfer Programming the SEND/RECEIVE InterfacePurpose of the FCs Agsend Agrecv Calling FCs in the CPU ProgramSEND/RECEIVE Interface in the User Program FC Calls Faster than the Transmission Time Data Exchange S7 CPU Ethernet CPFC Calls Slower than the Transmission Time Purpose of TCP Connections Special FeaturesAdditional Information Programming Data Transfer on TCP ConnectionsRecommendations for Use with a High Communications Load Known ProblemsRemedy SEND/RECEIVE Interface in the User Program Configuring Communication Connections Programming Setting up Connections and Using Them in the User ProgramConfiguring Initial SituationSimatic S5 Possible Connection ConfigurationsOrganization in a Multiproject Connections Characteristics of a ConnectionTasks of the Ethernet CP Requirements for Configuring Connections Creating a New Connection New ConnectionConfiguring Communication Connections Connections to Partners in Other Projects Connections to Non-S7 Stations using Substitute ObjectsHandling Connections in a Multiproject Unspecified Connections To or by a specific partner By any partner via specific Tsap EmptyToolbar Further FunctionsPrint Function in the Overview Tab Partner Connections Without AssignmentAssignment to a CP Menu option Edit ConnectionRemain without assignment Connection Partner Display Example Tabs Configuring ISO Transport ConnectionsIntroduction Opening the DialogGeneral Tab Specifying the Local Connection EndpointLaddr Attributes Description Access Local EndpointConnection Name Reference Only in Multiproject Block ParametersTsap MAC Specifying ISO Transport AddressesAddress Parameters TsapLocal and Remote TSAPs Tsap FormatAddresses Tab Unspecified ISO transport connection Default TSAPsData Transfer Attributes Description Access Connection EstablishmentSpecifying ISO Transport Dynamic Properties Dynamics TabAttributes Description Access Parameter Description Checking ISO Transport Connection PropertiesOverview Tab Connection Overview with Multiple CPUs in an S7 StationConfiguring ISO-on-TCP Connections Properties Specifying the Local Connection Endpoint Parameter Description Access Local Endpoint 11 Sending and Receiving on One ISO-on-TCP Connection Specifying ISO-on-TCP AddressesAddresses Tab Addresses Tab Unspecified ISO-on-TCP Connection Checking ISO-on-TCP Connection Properties Configuring TCP Connection Properties Specifying the Local Connection Endpoint 121 Connection Name Reference Only in Multiproject Address Parameters and Connection Types Specifying TCP AddressesTCP Ports Addresses Tab Specified TCP ConnectionApplication / Note Port Addresses Addresses Tab Unspecified TCP Connection Checking TCP Connection Properties Configuring UDP Connection Properties Specifying the Local Connection Endpoint 129 19 Sending and Receiving on One UDP Connection Specifying UDP AddressesAddresses Tab Specified UDP Connections Addresses Tab Unspecified UDP Connection UDP with Broadcast and Multicast When to Use Multicast instead of Broadcast?Configuring Communication Connections Addresses Tab Connection to all Broadcast Nodes Addresses Tab Connection to all Multicast Nodes Checking the Properties of a UDP Connection Program-Controlled Addressing Free UDP ConnectionConfiguration FETCH/WRITE ModeConfiguring Communication Connections System Memory S7 Addressing Mode OptionLinks to Other Systems Messages in the Diagnostic Buffer Routing to Distribute Load Routing to Distribute Load144 Programmed Communication Connections Overview Interplay between Programming and ConfigurationConfiguration Limits FB55 CpconfigSpecial Features / Restrictions Set the CP Properties in the IP Configuration tab Confdb Configuration Data BlockMeaning Block and Data StructureStructure Parameter Field for System Data CP NetworkingUsable Subfields Address Name Type Initial Value Comment ExampleGeneral Parameter Fields for Connection TypesConnection ID Sublocport Subremport Subconnectname Sublocmode Subkbusadr Parameter Field for TCP ConnectionType = ID = connection IDSubconestabl Subaddrindatablo Parameter Field for a UDP ConnectionSUBIPV4, Sublocport Subloctsap Subremtsap Subconnectname Sublocmode Subkbusadr Parameter Field for an ISO-on-TCP ConnectionSubemailsender Parameter Field for an E-Mail ConnectionType = ID = connection ID Subdnsname157 Subconnectname Sublocmode Parameter field for FTP connectionSublocport Subfield typesTotal, the following subfield types are available SubnetmaskFETCH/WRITE SubloctsapSubremmode 161 Page Programming FCs Functions and FBs for S7 Ethernet CPs Block Library General Notes on FCs / FBsWhich Block Version Should I Use? FCs and Module Replacement Spares Calling Communication Blocks for an S7-300 Setting Parameters for FC CallsResponse to Incorrect Addresses Setting Block Parameters Automatically1Cause Reaction / Code Evaluating Status Codes Parameters for Specifying a CPU Data Area input parametersStatus Information output parameters Specifying the Data Area on the CPUCan be used with Meaning FCs for the SEND/RECEIVE InterfaceAglsend / Aglrecv Working without the Job Header 8EH 0BH Working with the Job HeaderCall Meaning of the BlockAgsend / Aglsend How the Block Works Time 177 Parameter Declara Type Possible Remarks Tion Values Explanation of the Formal ParametersOn UDP Condition CodesOn ISO Transport8F7FH 8F3AH181 BEU Example of Agsend183 Agrecv / Aglrecv 2 FC6 Agrecv / FC60 Aglrecv185 186 Time Time NDR Output Bool Recv Input ANYStatus Output Word LEN Output INT NDR Error Status190 With FETCH/WRITE FCs for Access Coordination with FETCH/WRITELocks external data access Access with FETCH/WRITELocked = Aglock FETCH/WRITE Aglock FETCH/WRITE1 FC7 Aglock Locked Output Bool 2 FC8 Agunlock 196 FB55 Ipconfig for Programmed Communication Connections Set ACT = Time How It WorksOutput Word Confdb Input ANY200 8B0DH 8B0AH8B0BH 8B0CH202 Name Numeric Data / Resource Requirements of the FCsMC7 204 NCM S7 Diagnostics Where to Find Further Information Diagnostic Options in StepWhat You Should Already Know General diagnostic and statistical functions Functions of NCM S7 DiagnosticsMode-Dependent Functions Alternative Installing and Starting NCM S7 Diagnostics209 Menu Meaning General Menu CommandsOptions Customize 211 Establishing a Connection to the Ethernet CP Starting DiagnosticsStarting Diagnostics from the CP Properties Dialog Ways of Starting DiagnosticsProfibus Starting Diagnostics from the Windows Start MenuDiagnostics MPIAttachment of target Examples of an Online Path without GatewayPG/PC Rack / slot 0/5Case a One gateway Using a GatewayNode address gateway MAC 08-00-06-01-02-03 Rack / slot 0/5 Node address gateway MAC 08-00-06-01-02-03 Case b Several GatewaysNode address Profibus Address Gateway attachment Using the PC Station Setting a Gateway with PC internalStarting in the hardware configuration tool HW Config Other Ways of Starting DiagnosticsStarting in the properties dialog of the connections If the CP is in the RUN mode How to Use DiagnosticsStarting Diagnostic Functions Explicitly 221 Checklist for Typical Problems in a System Problem Possible Cause Identifying the Cause and Remedy Checklist for General CP FunctionsEvaluate status bytes in AG-SEND Communication Connections ChecklistEvaluate diagnostic buffer Check the user programFirmware Loader Load Files ApplicationFirmware Uses of the Firmware LoaderStarting the Download Loading FirmwareNCM S7 Industrial Ethernet Firmware Loader 228 References References Sinec CP Order Numbers Glossary General Section NCM S7 for Industrial Ethernet GatewayIndustrial Ethernet MulticastServer ServicesProcess image SegmentTransport interface SubnetSystem Transport layerInd. Ethernet station Base addressISO-on-TCP S5S5 connection Media Access Control MACMAC address RFC1006PROFInet PROFInet component Profibus devicePROFInet PROFInet device242 FETCH/WRITE Structure of Write Frames Structure of Fetch Frames Dbnr Parameter ValuesS7 Address Area ORG IDAddress Area PI/PQ248 New in Release 05 / V5.1 SP3 New in release 06New in Release 04 / up to V5.1 SP2 Page Simatic NET NCM S7 for Industrial Ethernet Release 6/2003 NCM S7 FETCH/WRITE Technical Support Service & Support on the Internet