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Omron CJ1W-ETN21 operation manual 183

Models: CJ1W-ETN21

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FINS/TCP Method

Section 7-4

Recovery Connection Sequence when Host Computer (WS) is Stopped by an Error

Client

Server

send

A

B
ACK	recv
ACK
C	send

acceptaccept

recv

D

ACK

Power

interruption E

connect SYN

ACK

F

send

I

RST

K

recv

FIN

close

ACK

SYN, ACK

G

ACK

H

send

close

J

FIN

recv

Connection error check

send

close

L connect

Connection is closed using TCP/IP protocol procedure.

ACK

1,2,3... In steps 1 to 4 the FINS message send and receive processing is performed using the FINS FRAME SEND command.

5.This example assumes that the host computer’s power is unexpectedly in- terrupted. The normal close processing cannot be performed at the host computer, and an attempt is made to establish a TCP connection at startup of the application after the power is turned ON again.

6.After establishing a TCP connection, the client sends the client node ad- dress to the server using the FINS NODE ADDRESS DATA SEND (CLI- ENT TO SERVER) command.

7.From the received command, the client’s node address is confirmed. At this time, the server determines that an attempt is being made to establish a connection with the same node address (see note), and detects a con- nection error.

8.The server sends a CONNECTION CONFIRMATION command to the cli- ent.

9.The client has lost the connection information from before the power inter- ruption, so sends a response with an RST frame in the TCP layer. The server that received the RST response closes the connection.

10.The server sends the error code (00000021 hexadecimal: Specified node is already connected) to the client using the FINS NODE ADDRESS DATA SEND (SERVER TO CLIENT) command.

11.The error code in the received command is also decoded by the client, and the TCP/IP port is closed.

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Omron CJ1W-ETN21 operation manual 183

Contents

Ethernet Units Construction of Applications Revised November  Omron Omron Product ReferencesPage Table of Contents FTP Server Index 207 Revision History 215 Table of Contents Section Contents Information on setting communications using CX-ProgrammerInformation on how to manage and use IP addresses CommandsRelevant Manuals Manual Model Name Contents NumberXiii Xiv Read and Understand this Manual Application Considerations Disclaimers Xviii Unit Versions Notation of Unit Versions on ProductsConfirming Unit Versions with Support Software Lowing table Unit Version NotationPrecautions General Precautions Safety PrecautionsIntended Audience Safety Precautions Application Precautions Operating Environment PrecautionsApplication Precautions EMC Directives Conformance to EC DirectivesApplicable Directives ConceptsSection Acquired for the Ethernet Unit Ethernet Unit Communications ServicesService Main functions Counterpart device Reference Functions Listed by PurposeSection Communications Protocol used Situation when used ReferenceUnit setting tag Table of ProtocolsCommon Protocol Settings Contents DefaultSmtp 2 POP 3 DNS Section Section Mail Send Function Description Mail Send Function OverviewIntroduction AdvantagesMail Send Function Details Comparison with the Earlier Mail Send FunctionMail Send Functions Compatibility with Earlier Models Contents of E-mail Body Trigger condition Text entered as subject Following header information is includedOptional Information Words value has changed Channel data has changed from XX toEthernet Unit Information Ethernet Unit information is always included in the e-mailMemory Data 6,000 Words Max Error Log Information Status InformationExtension Content Attached File DetailsSummary of E-mail Body Information and Attached Files File Data 1 MB MaxData sent Body/Attached file Mail body Mail Send Function Specifications Function SpecificationsSpecifications Classification Trigger type Using the Mail Send FunctionProcedure Details of the Available Mail TriggersUnit Setup Settings Required for the Mail Send FunctionTransferring the settings data Setting Setting requirement ReferenceUsing the Mail Send Function Set up to 2 destination mail addresses Mail AddressSend Mail Data Sent in an Attached File Send Mail Condition SettingsMail Address Specification Required Data Sent by Mail When Required Data Sent in E-mail BodyAttached File Name Send Mail Trigger Type Setting RequiredMail Send Function Status Send Mail StatusSend Mail Status Mail Send Switch, Accessing Memory/Sending Mail Flag Mail Send Switch Bit 03 of nBit numbers Status TXT Format Accessing Memory/Sending Mail Flag Bit 01 of n+17Memory Data Formats IOM FormatCSV Format Attached File Transfer TimesAccess Times for CS1-H and CJ1-H CPU Units Mail Send Function ErrorsIdentifying and Correcting Mail Send Function Errors Access Times for CS1 and CJ1 CPU UnitsProbable cause Correction Troubleshooting Mail Send Errors with LED IndicatorsError Log Error Codes for the Mail Send Function Error Meaning Detailed error code CorrectionExample Application Make the Unit Setup Settings from the CX-ProgrammerInitial Settings Example Initial Server SettingsSend Condition Setting Destination Mail Address SetupSend when there is a Change in the CPU Units Status Transfer the CPU Bus Unit Setup SettingsAutomatic Transmission when Send Condition is Satisfied Example Send e-mail when W300 bit 00 goes from OFF to onReceive Mail Function Description Configuration of the MailMail Receive Function Overview AdvantagesAttached File Data Table of Remote Mail CommandsCommand Parameters Command Execution ResultsMail Receive Function Specifications SpecificationReceived E-mail Response E-mail Using the Mail Receive Function Tion Settings Required for the Mail Receive FunctionReceive Mail Tab Posting Mail Address Protection SettingReceive Command Setting Receive Attached File SettingResponse Format Remote Mail Command DetailsCommand Format FormatMounted in the CPU Unit Command FormatFileWrite File Write FunctionFileRead File Read Card mounted in the CPU Unit FileDelete File DeleteFileList File List Read EM file memory or a Memory Card mounted in the CPU UnitResponse Format Details UMBackup User Memory Backup Command Format DetailsMemory or a Memory Card mounted in the CPU Unit Or a Memory Card mounted in the CPU Unit PARAMBackup Parameter Area BackupUnits I/O memory. The data is written in word units IOMWrite I/O Memory WriteSubject Body Units IOMRead I/O Memory ReadReIOMRead Changes the CPU Units operating mode ChangeMode Operating Mode ChangeBus Unit or Special I/O Unit ErrorLogRead Error Log ReadErrorLogClear Error Log Clear MailLogRead Mail Log Read Since power was turned on or the mail log was clearedNet Unit MailLogClear Mail Log ClearTest Mail Test FinsSend Fins Command Send Response ListResponse Response Status Description Code IOM Format Accessing Memory/Receiving Mail FlagAccessing Memory/ Receiving Mail Flag Bit 02 of n+17 Mail Receive Function StatusCSV Format TXT FormatAccess Times for CS1-H CJ1-H CPU Units Access Times for CS1 CJ1 CPU UnitsMail Receive Function Errors Identifying and Correcting Mail Receive Function ErrorsTroubleshooting Mail Receive Errors with LED Indicators Hex 1st byte 2nd byte Error code Meaning Detailed error code CorrectionDNS Server IP Address Setting DNS Tab, When Required Initial Settings for the Mail Receive FunctionItem name Example Send Remote Mail Commands Reading Data from a CPU Unit Data AreaBacking Up the CPU Units User Program Memory Card FTP Server Overview SpecificationsConnecting to the FTP Server FTP Server Function DetailsFile Types FTP File Transfer Mode Using the FTP Server FunctionSetting Details Default value List of Settings Required for the FTP Server FunctionSetup Tab CX-Programmer Settings Setting conditions TabConfidential FTP Server Application ExampleOpen Using FTP CommandsTable of Commands Using the CommandsUser DirRename Cdup MkdirRmdir PwdPut TypeGet MgetBye DeleteMdelete CloseError Messages and FTP Status Error MessagesMessage Meaning FTP Status Flag FTP IndicatorFTP indicator Meaning Checking FTP StatusDirectories Using File MemoryFile Memory File NamesFile type File name Extension Contents Description File Names Handled by CPU UnitUnit Data format Use of CRs and CR position Initializing File Memory4 I/O Memory Data Format Memory Initialization methodSection 9ABC File system Memory Card EM File Memory FTP File Transfer TimeCS1 CPU Units/CJ1 CPU Units CS1-H CPU Units/CJ1-H CPU UnitsUnix Application Example Enter the login nameWrite the file PLAN.IOM to the Memory Card Change to the Memcard directoryChange data type to binary Transfer the file RESULT.IOM to the workstationSection Automatic Clock Adjustment Function CPU Unit Conditions OverviewUsing the Automatic Clock Adjustment Function Settings Setting conditions Reference Settings Required for Automatic Clock Adjustment FunctionAuto Adjust Time Automatic Clock Adjustment Switch Bit 04 of n Automatic Clock Adjustment SwitchAutomatic Clock Adjustment Error Processing Automatic Clock Adjustment Sntp ErrorsAutomatic Clock Adjustment Error Processing CPU Unit error Socket Services Page Socket Port Numbers Using Sockets with the Ethernet UnitOverview of Socket Communications from Ethernet Units What are Sockets?TCP Communications Protocol OverviewDifferences between TCP and UDP Opening TCP SocketsPassive Open and Active Open TCP Communications ProcedureFragmentation of Send Data Socket Service Functions Protocol Socket Service Request CMND490 Using Socket Services with Socket Service Request SwitchesProtocol Socket service request Using Socket Services with CMND490Specific Socket Service Functions Command code NameExecuting CMND490 Socket Service Function GuideDifferences with Previous Models Manipulating Dedicated Control BitsManipulating Dedicated Control Bits Using Socket Service FunctionsSettings Required for Socket Service Function CX-Programmer Setting Setting requirements Unit Setup TabDetails Default value Setup109 Socket Service Status CIO Area AllocationsUDP/TCP Socket Status Ethernet Unit to CPU Unit DM Area Allocations Bit Switch Status Manipulated Unit operationNumber Status Meaning Application ProcedureProcedure TCP Connection Status Ethernet Unit to CPU UnitPrecautions Socket Services and Socket StatusProgram Flow Error EvaluationSocket Service Parameters TCP Socket Services Parameter SettingsUse of the parameters by the socket service UDP Socket ServicesLocal UDP/TCP Port No ParametersSocket Option UDP/TCP Socket NoNumber of Bytes to Send/Receive Following specifications can be usedRemote UDP/TCP Port No Time Out TimeFollowing diagram Socket Service Request SwitchesResponse Meaning Code Response CodesUDP Socket Open Request UDP Socket Receive RequestUDP Socket Close Request UDP Socket Send RequestTCP Socket Active Open Request TCP Socket Passive Open RequestDrinuse TCP Socket Receive RequestTCP Socket Send Request Processes Timing ChartsTCP Socket Close Request Closing during OtherForce-close Switch Close Request SwitchBasic Operations System Configuration8 TCP/IP Communications Programming Example Data FlowProgram Memory Map DM AreaCIO Area TCP Passive Open Programming Example130 9 UDP/IP Communications Programming Example Programming example uses the following system configurationCIO 000000 is turned on to request opening a UDP socket from Tion on errors133 134 135 Using Socket Service Using Socket Services with CMND490137 Results Storage Area Basic Fins Command FormatCommand Code Socket NumberResponse Codes in the Results Storage Areas Response Codes in the Command ResponseCommunications Timing Chart Socket Service Timing Chart140 Close Request during Receive Request System ConfigurationBasic Operations Data FlowAre structured Program Memory Maps144 145 146 147 148 149 150 151 152 153 154 TCP Socket Service Precautions in Using Socket ServicesUDP and TCP Socket Services UDP Socket ServicePrecautions in Using Socket Service Request Switches Maximum Transmission Delays Ignoring other Network Delays TCP Socket Services Using CMND490 CS/CJ CPU UnitsCS-H/CJ-H CPU Units Calculation Using Fins Communications to Create Host Applications Communications On an Ethernet Network Overview of Fins CommunicationsFins Communications Service Specifications for Ethernet Using the FINS/UDP and FINS/TCP MethodsFins Header Information Fins Command Frame FormatFins Frames Fins Response Frame FormatFINS/UDP Method FINS/UDP FeaturesFINS/UDP FINS/UDP Frame Format UDP Port Numbers forProcedure for Using Sending Commands from a Host Computer Designating Remote AddressesCommunications Parameters Used by Host Computer Operation Overview By sending a Fins command Memory Area READ, command codeMand, the command will be resent FINS/UDP Sample Program15 * FINS/UDP Communications Sample Program Sample Program169 170 FINS/TCP Method FINS/TCP FeaturesFINS/TCP Frame Format TCP Port Number forFINS/TCP Connection Numbers Communications FINS/TCP Connection Status Word n+23Age them in an internal table Automatic Allocation Fins Node Addresses Automatic Allocation Procedure175 FINS/TCP Tab Setup TabFINS/TCP Headers FINS/TCP Mode SpecificationsFins Node Address Data Send Client to Server Command Fins Node Address Data Send Server to Client CommandFins Frame Send Command Following table shows the list of error codesError code Details Hexadecimal Command Fins Frame Send Error Notification CommandNormal Operation Connection SequenceACK FIN Error Connection Sequence182 183 Host computer Remote node From onwards, the connection is established againFINS/TCP Sample Program 186 187 188 189 190 191 Receive Processing Command CPU Bus Unit Service Cycle Maximum Transmission Delays Writing/Reading to CPU UnitWrite Command Delay Time Transmission DelayResponse Read Command Delay TimeTransmission Processing 704 ms194 Parameter Value Description Ethernet Network ParametersAppendix a Appendix B Buffer ConfigurationNetwork Memory Status Meaning TCP Status TransitionsAppendix C Space Ascii CharactersAppendix D Replacing an Ethernet Unit MaintenanceSettings after Replacing an Ethernet Unit Settings After Replacing a CPUAppendix E Inspections ItemsTools Required for Inspection Appendix F Numerics Index 209 210 211 212 213 214 Revision History Revision code Date Revised contentRevision History Regional Headquarters Omron 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