TCP/IP Specific Issues | Schneider Optics Modicon Quantum Ethernet

Quantum Ethernet TCP/IP Modbus Application Protocol

C.3 TCP/IP Specific Issues

C.3.1 Broadcast/Multicast

Although broadcast and/or multicast are supported by both IP network address and IEEE 802.3 MAC address, the Modbus Application Protocol does not support either broadcast or multicast at the application layer.

Schneider Automation’s Quantum PLCs use broadcast addressing because they use ARP as the means of locating the destination node. The client interface to the Modbus Application Protocol service on the PLC, the MSTR block, requires the user to provide the destination IP address. Also the embedded stack does use a pre-configured default gateway IP address in the case where ARP does not succeed.

C.3.2 TCP Port Number

Schneider Automation has obtained a well-known system port from an Internet Authority. Schneider Automation’s well-known system port number is 502. The Internet Authority assigned the system port number 502 to asa-appl-proto with Dennis Dubé as the company point of contact.

This port number allows Schneider Automation to transport various application protocols over with TCP or UDP. The particular protocol is indicated by the value of the proto_id parameter in the mbap_pdu. Currently the only assignment is 0 meaning Modbus Application Protocol.

82	840 USE 115 00 Version 1.0

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Schneider Optics Modicon Quantum Ethernet manual TCP/IP Specific Issues, Broadcast/Multicast, TCP Port Number

Contents

Modicon Quantum Ethernet USE 115 00 Version Training October Modicon Quantum EthernetUSE 115 00 Vesion Document Set Preface USE 115 00 Version Contents Using the Network Options Ethernet Tester Chapter MaintenanceMstr Instruction Retrieving Data via the World Wide Web Appendix a Specifications Appendix D Suppliers Glossary Index Contents Viii About This Book Document Scope Validity Note Related Documentation Introduction Ethernet Web Embedded Server Modules Benefits of Quantum Design Models for Fiber Optic and Twisted Pair Cable Systems Type of Cable Network Part Number Front Panel Components Removable Door 140 NOE 251 Color Indication When On LED Display Address Labels EthernetAddress Label Internet Protocol IP Network Address Label Example Calculating the Derived IP Network Address Locate the global address label onFront panel of the module 0 B 7 2 a Transmit Data Twisted Pair ConnectorFiber Optic Connectors Errlog Utility DisketteNetwork Options Ethernet Tester Ethernet and Your Application Meeting the Demands of Your Application Compatibility Guidelines for Designing Your Network Delays Using SwitchesSegregating Traffic Installing and Configuring Module Before You Begin Verifying the Default Configuration Verifying that the Network Has Been Constructed Properly Improper Network Topologies Mounting the Module on the Backplane Installing the ModuleAre You Really Ready to Install? Check Connecting the Cable With connectors 990 XCA 656Twisted Pair Snap into place Attaching the Cable Changing the Default Configuration Configuring the Module with Modsoft Selecting the Ethernet Framing Type Assigning a Slot Number Assigning the IP Network Address Assigning the Default Gateway Address and Subnet MaskResetting the Module Configuring More Than One Ethernet Module Configuring the Module with Concept Parameter Dialog for an Ethernet Web Embedded Server Module Mstr Operation Code TCP/IP Ethernet Support Mstr Instruction IntroductionMstr Description Characteristics SizeCompatibility Opcode BF hex Content RepresentationInputs Outputs Mstr Function Error Codes Error CodesMiddle Node Bottom Node Hex Error Code Meaning Ss Hex value Meaning Hex Error Code Meaning 5016 An argument is valid Read and Write Mstr Operations Control BlockUtilization Information as described in the following table Get Local Statistics Mstr Operation Statistics information as described in the following table Clear Local Statistics Mstr Operation Get Remote Statistics Mstr Operation Clear Remote Statistics Mstr Operation Peer Cop Health Mstr Operation Peer CopCommunications Health Status Type Word Status Index Module information as described in the following table Reset Option Module Mstr OperationRead CTE Config Extension Table Mstr Operation Parameter Register Content CTE DisplayImplementation Registers. The registers display the following CTE data Write CTE Config Extension Table Mstr Operation 13 TCP/IP Ethernet Statistics Word Meaning Retrieving Data via the World Wide Web Introduction Accessing the Web Utility Home Web Utility Home Web Utility for Quantum Quantum Web Utility Retrieving Data via the World Wide Web Using the Network Options Ethernet Tester Introduction Installing the Network Options Ethernet Tester Establishing a Connection with an Ethernet Module Main Menu Getting and Clearing Statistics Get Statistics Box MAC Address Sample Statistics Using the Network Options Ethernet Tester Reading and Writing Registers Read Register Box Write Register Box Maintenance Responding to Errors Detecting Errors Active LED Ready LED Kernel LED Fault LEDLink LED Collision LED LED Display for Improperly Connected Twisted Pair Cable Reading and Clearing the Error Log Application LED Default is Example Errlog 49 EBX, EBP, ESI, EDI, ESP, EFLAGS, EIP Example Sample Error Log To restart the controller, type Y Hot Swapping An Ethernet Module Downloading a New Software Image From the Device to Download menu, select Local Head USE 115 00 Version Specifications Power Dissipation Bus Current Required Operating ConditionsCommunication Ports Storage Conditions Specifications Ethernet Developers Guide Introduction References Overview Development Environment Class Descriptions CSampledoc Class Event Description Accessing TCP/IPCSampleView Class Application Message Format Network Event Member Function Timers Transaction Processing Transmit State Machine Exists the loop Receive State Machine Ethernet Developers Guide Displaying on the Screen Quantum Ethernet TCP/IP Modbus Application Protocol Modbus Application Protocol PDU Includes the dstid and data fieldsIs defined below Counts and data offsets Modbus Application Protocol Service Classes Modbus Application Protocol PDU Analysis Quantum Ethernet TCP/IP Modbus Application Protocol TCP Port Number TCP/IP Specific IssuesBroadcast/Multicast Reference Documents Quantum Ethernet TCP/IP Modbus Application Protocol Suppliers Suppliers Glossary AddressBps Bridge Default gateway FieldFrame Framing types Hub InternetIP Address IO Map OSI model PacketPort Protocol Switch SocketStack Subnet Glossary Index Index Mstr Network Options Ethernet Tester World Wide Web server