Siemens S7 appendix Connections, Characteristics of a Connection

Page 87

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.

The free UDP connection is the exception to this. Here, the address is specified at the FC interface in the user program.

SIMATIC S7 station with Ethernet CP

send

receive

send

receive

 

Ethernet

 

node

Communication

receive

 

connection

send

 

 

Ethernet

 

node

Communication

receive

 

connection

send

 

Figure 4-3 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

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Contents Simatic NET Classification of Safety-Related Notices Correct Usage of Hardware Products Safety Instructions Regarding your ProductTrademarks Qualified PersonnelCopyright E Siemens AG 2001-2002All rights reserved Prior to StartupPrimer Communication services with / NCM S7S7-CP and / NCM S7 ManualSymbols used in this Manual AudienceScope of this Manual Manual Title ContentNCM S7 for Industrial EthernetTopic Document Additional Information on Simatic S7 and StepConventions Access to Online Help of and NCM S7Contents 175 Programming FCs Functions and FBs for S7 Ethernet CPs 141211 191197 201Communication via Ethernet CPs in S7 Stations All-Round Communication in the Industrial Sector Network AccessIndustrial Ethernet DefinitionSimatic S7 Communication with S7 Ethernet CPs Types of CommunicationPG/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 FTPConfiguration and Diagnostics Application PG/OP Communication via Industrial EthernetIsdn Configuration for PG/OP OperationPG Communication with over Industrial Ethernet Requirements for PG CommunicationNetworking the PG / Engineering Station Requirements ProcedureS7 Communication on Industrial Ethernet NodesClient and server functionality at both ends Profibus Configuring S7 Connections Interface in the User Program of the S7 StationBlock type Client Server Described Communication via Ethernet CPs in S7 Stations ISO Transport Connection S5-compatible Communication SEND/RECEIVE Interface1SEND/RECEIVE interface IP Internet ProtocolWAN StationsFETCH/WRITE Services Server Coordinating Access Using the User ProgramConnection Types Tools ConfiguringNetworking Stations with Step Networking in a MultiprojectVariants Variant examples Characteristics/ConfigurationConfiguration of the System Network/Project Variant One Subnet One ProjectView in a Project Simatic S5 Network/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 Communication via Ethernet CPs in S7 Stations Installing and Starting the Ethernet CP With Step Installation FunctionsOperation Procedure Configuration data in the projectUDP Creating an Industrial Ethernet Subnet AimsSelect Insert Subnet Industrial Ethernet Properties of Merged Subnets Multiproject Installing and Starting the Ethernet CP with Step Subnet Attachment Entering an Ethernet CP in the Hardware ConfigurationInstalling 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 FormSetting Further CP Properties OverviewAddresses Tab Option Meaning / Effect Options TabCPU Default Setting Time-of-Day Synchronization Tab Addressing Tab Diagnostics TabNon-Siemen 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 Downloading the Configuration Data to the Target System PrincipleType of Interface Deactivating the MAC Address in the Configuration Saving the Configuration Data in Non-Volatile MemoryDownloading the Configured Connections Relocating the CP in the Hardware Configuration Page SEND/RECEIVE Interface in the User Program Ethernet CP How the SEND/RECEIVE Interface Works on the CPUFunctions FCs Amounts of DataProgramming Connections Programming the SEND/RECEIVE InterfacePrinciple of Job and Data Transfer Purpose of the FCsAgsend Agrecv Calling FCs in the CPU ProgramSEND/RECEIVE Interface in the User Program Data Exchange S7 CPU Ethernet CP FC Calls Faster than the Transmission TimeFC Calls Slower than the Transmission Time SEND/RECEIVE Interface in the User Program Purpose of TCP Connections Special FeaturesAdditional Information Programming Data Transfer on TCP ConnectionsKnown Problems Recommendations for Use with a High Communications LoadRemedy SEND/RECEIVE Interface in the User Program Configuring Communication Connections Program the SEND/RECEIVE interface in the user program ConfiguringSteps ProgrammingSimatic S5 Possible Connection ConfigurationsOrganization in a Multiproject Connections Characteristics of a ConnectionTasks of the Ethernet CP Requirements for Configuring Connections New Connection Creating a New ConnectionConfiguring Communication Connections Configuring Communication Connections Connections to Non-S7 Stations using Substitute Objects Connections to Partners in Other ProjectsHandling Connections in a Multiproject Unspecified Connections By any partner via specific Tsap EmptyTo or by a specific partner Configuring Communication Connections Further Functions ToolbarPrint Function in the Overview Tab Partner Connections Without AssignmentAssignment to a CP Menu option Edit ConnectionRemain without assignment Connection Partner Display ExampleTabs 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 Using Fetch Passive / Write Passive ISO Transport with the FETCH/WRITE ModeMessages in the Diagnostic Buffer System MemoryLinks to Other Systems 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 Address parameter Specifying ISO-on-TCP AddressesAddresses Tab Addresses Tab Unspecified ISO-on-TCP Connection ISO-on-TCP with the FETCH/WRITE Mode 117 Checking ISO-on-TCP Connection Properties Configuring TCP Connection Properties Specifying the Local Connection Endpoint 121 Specifying TCP Addresses Address Parameters and Connection TypesTCP Addresses Tab Specified TCP Connection PortsApplication / Note Port Addresses Addresses Tab Unspecified TCP Connection TCP with the FETCH/WRITE Mode System Memory Checking TCP Connection Properties Configuring UDP Connection Properties Specifying the Local Connection Endpoint Connection Name Reference Only in Multiproject 23 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 ?135 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 ConnectionRouting to Distribute Load Routing to Distribute LoadProgramming FCs Functions and FBs for S7 Ethernet CPs Block Library General Notes on FCs / FBsWhich Block Version Should I Use? FCs and Module Replacement SparesProgramming FCs Functions and FBs for S7 Ethernet CPs Calling Communication Blocks for an S7-300 Setting Parameters for FC CallsSetting Block Parameters Automatically1 Response to Incorrect AddressesCause 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 Configured ConnectionsAglsend / Aglrecv Working without the Job Header 8EH 0BH Working with the Job HeaderMeaning of the Block CallAgsend / Aglsend How the Block Works Time Parameter Declara Type Possible Remarks Tion Values Explanation of the Formal ParametersOn UDP Condition CodesOn ISO Transport8F3AH Done Error Status8F7FH BEU Example of Agsend160 Agrecv / Aglrecv 2 FC6 Agrecv / FC60 AglrecvProgramming FCs Functions and FBs for S7 Ethernet CPs Status code is updated at each block call Recv Input ANY NDR Output BoolStatus Output Word LEN Output INT NDR Error Status166 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 172 Numeric Data / Resource Requirements of the FCs NameMC7 174 NCM S7 Diagnostics What You Should Already Know Diagnostic Options in StepWhere to Find Further Information OverviewFunctions of NCM S7 Diagnostics General diagnostic and statistical functionsMode-Dependent Functions Alternative Installing and Starting NCM S7 DiagnosticsStructure General Menu Commands Menu MeaningOptionsCustomize 181 Profibus Starting Diagnostics from the NCM Program GroupInitial Situation MPIStarting Diagnostics from the Properties Dialog of the CP InternetworkingTCP/IP Other Startup Options If the CP is in the RUN mode How to Use DiagnosticsCall-Specific Diagnostic Functions 187 Meaning Checklist for ‘Typical Problems‘ in a SystemProblem 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 Loader1st Step NCM S7 Firmware Loader menu commandLoading Firmware Starting the Download3rd Step 2nd Step195 196 References References Sinec CP Order Numbers Glossary General Section NCM S7 for Industrial Ethernet GatewayIndustrial Ethernet MulticastSegment ServicesPROFInet ProtocolTransport layer SubnetSystem Transmission rateBase address Ind. Ethernet stationISO-on-TCP S5S5 connection Media Access Control MACMAC address RFC1006PROFInet PROFInet device, proxy Profibus devicePROFInet PROFInet devicePage FETCH/WRITE Structure of Write Frames Structure of Fetch Frames Dbnr Parameter ValuesS7 Address Area ORG IDAddress Area PI/PQ216 New in Release 04 / up to V5.1 SP2 New in Release 05 / V5.1 SP3Page Index-223 NCM S7 Technical Support Service & Support on the Internet
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S7 specifications

The Siemens S7 series represents a cornerstone in the realm of programmable logic controllers (PLCs), developed by Siemens, a leading company in industrial automation. Widely used across various industries, the S7 series offers robust solutions for controlling machinery and processes, thanks to its reliable performance, flexibility, and scalable architecture.

One of the key features of Siemens S7 PLCs is the modularity of their design. Each system can be configured to meet specific application requirements due to the ability to mix various input/output modules, CPUs, and communication processors. This modular approach allows for the customization of systems to suit diverse automation tasks, providing end users with the adaptability required for modern manufacturing environments.

The S7 series encompasses several models, including the S7-1200, S7-300, and S7-1500. The S7-1200 is particularly suited for small to medium-sized applications, offering a compact design and integrated communication interfaces. In contrast, the S7-300 is designed for more extensive and complex control systems, making it ideal for large-scale industrial applications. The S7-1500 stands out with its advanced performance metrics, rich feature set, and high-speed processing capabilities, making it perfect for demanding applications that require real-time control and extensive data handling.

Siemens also emphasizes the importance of communication technologies within the S7 series. With options such as PROFINET, PROFIBUS, and EtherNet/IP, the S7 PLCs can seamlessly integrate into existing automation infrastructures, ensuring smooth data exchange between devices. The incorporation of web-based technologies and cloud connectivity further enables remote monitoring and control of systems, enhancing operational efficiency.

Another notable characteristic of Siemens S7 PLCs is the use of TIA Portal (Totally Integrated Automation Portal), an innovative software platform that simplifies the engineering process. TIA Portal allows users to program, configure, and diagnose their automation devices in a single environment, reducing setup times and improving productivity.

In conclusion, the Siemens S7 series stands out due to its modular design, range of models suitable for various applications, advanced communication technologies, and user-friendly programming software. This combination of features and characteristics makes S7 PLCs a preferred choice for industries seeking reliable and efficient automation solutions. As industrial demands continue to evolve, Siemens S7 PLCs remain at the forefront, adapting to technological advancements and setting benchmarks in the automation field.
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