Sequencing Communications Requests | GE GFK-1004B specification

4

Sequencing Communications Requests

If the Ethernet Interface receives Command Blocks from the PLC faster than the Inter- face can process them, the Interface will log an exception event 08, Entry 2=0024 and will log the PLC Fault Table entry:

ªBackplane Communications with PLC Fault; Lost Requestº

Only one COMMREQ function per channel can be pending at one time. A COMMREQ function is pending from the time it is initiated in the ladder program until its CRS word has been updated to a non-zero value by the Ethernet Interface.

Data Transfers with One Repetition

If your ladder program for issuing COMMREQs is constructed so it does all the follow- ing, all available TCP connections can quickly be used up.

HThe number of repetitions (word 9 in an Establish Channel COMMREQ) is set to 1 and a new COMMREQ is issued immediately upon completion of the prior one.

HEach successive COMMREQ is directed to the same target device (same IP address).

HEach successive COMMREQ is directed to the same channel number.

To avoid using up all TCP connections, set the number of repetitions (COMMREQ word

9)to 2 and set the read/write period (COMMREQ words 10 and 11) to be very large, for example, 60 seconds. With these parameters the ladder program will issue the first COMMREQ, wait for the COMMREQ Status (CRS) word to turn to 1, then issue the next COMMREQ, wait for the CRS word to turn to 1, and so forth.

By interrupting an active channel, you allow the reuse of an existing TCP connection, while a repetition count of 1 started the time-consuming TCP connection teardown immediately.

GFK-1004B

Chapter 4 Programming Communications Requests

4-39

Image 127

GE GFK-1004B user manual Sequencing Communications Requests, Data Transfers with One Repetition

Contents

GE Fanuc Automation GFL±002 Preface Content of this Manual Related Publications PrefaceWe Welcome Your Comments and Suggestions Contents Installing and Starting-Up the GSM Accessing the Station Manager Station Manager Command Descriptions Appendix a Glossary Appendix G Advanced Information About IP and MAC Addresses Major Components of the TCP/IP LAN Xiii Xiv GFK-1004B Major Components of the TCP/IP LAN Ethernet Communications System Capabilities of the Ethernet Interface Ethernet Interface Introduction Attachment of the Ethernet Interface to the LAN GEnet System Manager GSM Ethernet Software Access to the Station Manager on the Ethernet Interface Configuration EditorDownloader IBM PC PLC How to Make it Work Quick Guide to the Manual Tasks Where to go in the Manual Ethernet Interface Hardware Overview Chapter Installing the Ethernet Interface Ethernet Controller Board Restart Button Board IndicatorsEthernet Controller Board Indicators Indicator Status Description AUI Transceiver Port BatteryDefault Station Address Label Serial Port Ethernet Controller Board Installation Equipment Required to Perform the Installation Procedures Ethernet Controller Board Installed in Series 90-70 PLC Rack Using the GSM ªAccess Station Managerº Function States of the Ethernet Interface States of the Ethernet Interface Ethernet Interface Online Powering-Up the Ethernet Interface LED Pattern Where Stopped Possible Cause Corrective Actions Problems During Power-Up Installing the Ethernet Interface PLC Systems with CPU Firmware Version 5.03 or Later To configure the Ethernet Interface Installing the Ethernet Interface GFK-1004B Installing the Ethernet Interface PLC Systems with CPU Firmware Versions Prior to Installing the Ethernet Interface GFK-1004B Installing the Ethernet Interface Configuring a Station Procedure 4 Configuring and Downloading a Station Downloading a Station When Must a Station Be Downloaded? Ethernet Interface Initiating the DownloadLocal Downloading MAC Address Download Mode/ Load Source Loader State How to Issue the Load Command from the Station Manager Problems During the DownloadNetwork Downloading Field Network Test Utility Procedure 5 Testing the Ethernet Interfaces on the Network Invoking the Field Network Test Utility Running Field Network Test Issue the desired Test command to initiate the network test REM Installing the Ethernet Interface Procedure 6 Pinging the TCP/IP Interfaces on the Network REM Chapter GEnet System Manager±Station Configuration GSM also provides the following support functions What is the GSM?Why Does a Station Have to be Configured and Downloaded? Primar y GSM functions are Connecting the GSM to the LAN Interface Hardware Requirements Installing and Starting-Up the GSM 3/Ethernet Cards for the PC Installing the PC Network Card for Network GSM OperationVendor Model Size PC Bus Width Default PC Hardware Settings for 802.3/Ethernet Cards Installing the GEnet System Manager GSM SoftwareVendor Vendor Model Restrictions Default Hardware Settings Create a directory for the GSM by typing Local GSM Operation Exclusively Setting-Up DOS System FilesNetwork GSM Operation or Both Local and Network Checking for Existing Ndis Applications on Your PC When the GSM is the Only Ndis Application on the PC Network Card Driver When an Ndis Application Already Exists Etherlinkii Updating or Adding to Existing GSM Software Unusual ProceduresChanging the PC Network Card GSM Main Menu Starting-Up the GSM Working Your Way through the GSM Menus GSM Keyboard Functions Alt-K GSM Keyboard FunctionsGSM Keyboard Keys Function GSM Menu Structure GSM Menu Structure Configure a Station Screen Configuring a Station Field Definitions for the Configure a Station Screen Creating a Station Configuration File GEnet System Manager±Station Configuration Deleting a Station Configuration File Selecting a Station Configuration FileStructure of the MAC Address Configuration Editor Menu Configuration Editor Menu for Series 90-70 PLCs TCP/IP Parameters Screen IP Address Address as Configured on the Screen Precedence of TCP/IP Parameter Sources Determining If an IP Address Has Already Been Used Advanced Parameters Menu Advanced Parameters Menu Data Link Parameters are defined as follows Data Link Parameters Screen GFK-1004B Memor y Pool Allocation Parameters System Parameters Screen Station Manager Parameters are as follows Ranges for the Buffer Pool Parameter values are Download Station Screen Downloading a StationDownloading Locally Over the Serial Port Downloading Over the Network System files integrated for Station Station Name Access Station Manager Screen Accessing the Station Manager List All Stations Screen Using the GSM Support Functions GFK-1004B Changing the GSM Password Screen Setup GSM Menu To Set the Station Manager Mode Set Download Mode ScreenSet Station Manager Mode Screen To Set the Download Mode Chapter ProgrammingCommunications Requests Structure of the Communications Request Communications Request Commreq FunctionBlock Commreq Command BlockChannel Commands Advantages of Channel Commands Status Data Domain of a TCP connection Domain of a channel Operation of the Communications Request Commreq FunctionBlock Commreq Function Block and Command BlockRack Slot Commreq Command Block Type Value Description Decimal Hex Establishing a Channel Channel CommandsAborting and Re-tasking a Channel Specifying the Location of the Channel Status Retrieving Detailed Status on the Channel Establish Read Channel Example Command BlockDec Hex Value Meaning Time Unit Values for Read/Write Repetition Period Value Type Decimal Description Series 90-70 PLC Memory Types GFK-1004B Establish Write Channel GFK-1004B Programming Communications Requests Send Information Report Example Command Block Programming Communications Requests GFK-1004B Abort Channel Retrieve Detailed Channel Status Programming Communications Requests Assign Channel Status Vector Types of Status Data Status Data Status Bits Description of the Status DataOK Output of the Commreq FunctionBlock FT Output of the Commreq FunctionBlock Status Bits Brief Description Status Bits LIS Bits and Channel Status Bits Each channel has a dedicated pair of bits as follows Format of the Commreq Status Word CRS Word Communications Status Words Error Status Major Error Description Major Error Codes Error Status Service Request Error Description Minor Error Codes85H at Client PLC Error Status Srtp Error Description Minor Error Codes for Major Error Codes 5H and 85H Error Status Application Interface Error Description Minor Error Codes for Major Error Code 90H at Client PLC Essential Elements of the Ladder Program Controlling Communications in the Ladder Program Lanifok +ÐÐ Ððððð ÐÐÐ+BLKMV+Ð INT Commreq Status Word is Not One Troubleshooting Your Ladder ProgramFT Output is on Commreq Status Word is Zero 0 and FT Output is OFF Monitoring the Data Transfer Bit Monitoring the Channel Error BitMonitoring the Communications Channel Monitoring the Commreq Status Word Sequencing Communications Requests ªBackplane Communications with PLC Fault Lost RequestºData Transfers with One Repetition Chapter Station Manager Station Manager Services 802.3 LAN 802.3 LAN Accessing the Station Manager Using the GSM Remote Operation of the Station Manager Accessing the Station Manager Using an Ascii Terminal Using the Station Manager Monitor Commands Using the Monitor CommandsCommand Description Using the Monitor Commands to Troubleshoot the Network Using the Modify Commands Modify Commands Station Manager Command SyntaxDate and Time Task Identifiers Task IdentificationDisplay Data Representation Numeric Values IP Address Byte String Values Station Manager in Utility Programs Soft Switch Entry Utility Command Restrictions Soft Switch Entry Utility Commands Field Network Test Utility Field Network Test Utility Commands Control Character Usual Keyboard Function Command DescriptionsCommand Input Processing Control Characters Channel Command Chbps Command BPS CommandChdate Command Chsosw Command Chltime Command Parameter Value Description Load Source Parameters Soft Switch Default Value Chtime Command Clsosw Command Clear Command EXS Command Date CommandHelp Command Typical Help command when you are logged in is shown below LOG Command Load Command Log Event Definitions Login CommandLog Event Hexadecimal Cause Ltime Command Logout CommandNET Command OK Command Node CommandPing Command REM Command Prog Command Interpretation of Test Results Report Command Restart Command Repp Command Show Command 10. Configuration Parameters Configuration ParametersParameter Description Default Value IPConfigurationParameters 10. Configuration Parameters Description Default Value Stat Command Sosw Command Stopt Command Stopp Command 11. PLC Driver Tallies Tally c Tally CommandTally Meaning 13. Channel API Tallies Tally h 12. Address Resolution Protocol ARP Driver Tallies Tally f 14. Internet Protocol IP Tallies Tally 15. Internet Control Message Protocol Icmp Tallies Tally j MAC Layer Tallies part of Tally l Data Link Tallies part of Tally l 19. Transmission Control Protocol TCP Tallies Tally w Test Command Trace Command Time Command = trace Trace enabled for Minutes Remaining = Lenref Overview Chapter Troubleshooting Ethernet Interface Diagnostic Tools Using this ChapterDiagnostic Tool Description Reference Troubleshooting Determining the State of the Ethernet Interface What to do if you Cannot Solve the Problem Running Wait for Field Wait for PLC Diagnostic Power-Up StateSoft Switch Entry State Power-Up State Field Network Test State Soft Switch Entry StateSoft Switch Entry State Field Network Test State Over Local Serial Load Downloader Network Port Not on Loader StateLoader State Local Operational State Troubleshooting When Status OK LED is OFFOperational State Troubleshooting with Online LED OFF Troubleshooting When the Status OK LED is onLED Indicators Possible Cause and Resolution Log Event Cause Exception Log Event Error CodesTroubleshooting with Online LED on Exception Log Event Definitions 10. Exception Log Event Codes Log Event Code Possible Cause and Resolution Log Event Code Actual installed CPU microcode version System Error cccc Eventª8º PLCDriver events 10. Exception Log Event Codes 10. Exception Log Event Codes 10. Exception Log Event Codes 10. Exception Log Event Codes 10. Exception Log Event Codes 10. Exception Log Event Codes Event ª12º TCP events = Closed = Listen = SYN-SENT = SYN-RECEIVED = Established Eventº12º TCP events Log Event Code Possible Cause and Resolution 10. Exception Log Event Codes 10. Exception Log Event Codes 10. Exception Log Event Codes Idle Eventª1bº Srtp server event 10. Exception Log Event Codes 10. Exception Log Event Codes Event ª1cº ChannelAPI events Unknown Readdata Writedata Writedcs Writecrsw Writecsb 10. Exception Log Event Codes 10. Exception Log Event Codes Commonly Used Acronyms and Abbreviations Appendix Glossary Glossary of Terms Appendix a Glossary GFK-1004B Appendix a Glossary GFK-1004B Appendix a Glossary GFK-1004B Serial Port Pinouts Serial Port SettingsSerial Port for Local GSM Communications What this Appendix Contains Table B-1. Pinouts of the Serial Port Display Terminal SettingsPin Number Signal Description Serial Cable Ethernet AUI Port Pinouts AUI Port for the Ethernet InterfaceTable B-2. Pinouts of the AUI Port Transceiver Description AUI Transceiver Cable Table B-3 Base5 Transceiver Configuration Config Mode Appendix Soft Switch Parameters Station Address Network Load Address Load SourceLAN Online Backplane Online Table C-1. Soft Switch Settings Modify Soft Switch SettingsParameter Description Configuring Soft Switch Parameters Using the GSM Configuring Soft Switch Parameters Soft Switch Entry Utility Correct Results of Soft Switch Configuration Appendix Sample DOS System Files 3Com Etherlink \CONFIG.SYS Appendix D Sample DOS System Files ELNK16.DOS Drivername = ELNK16$ 3Com Etherlink /MC Macwdnif Intel Xircom Pocket Adapter PE2 Xircom Pocket Adapter PE3 Smcmacnif IBM Pcmcia Optimizing the GSM for Network Operation Error Code Description Table E-1. GEnet System Manager Data Link Error Codes Fmalloc error Error Code Hexadecimal Description Table E-2. Ndis Error Codes Test Form Appendix Network Test Form Init Node Resp Node Resp node AcceptableRate Network Test Data Sheet Figure G-1. IP Address Format for Network Classes A, B, C IP Addresses Range of first integer Class Gateways Subnets Figure G-3. Network Configuration Using a Subnet Mask MAC Addresses Appendix Sample Ladder Program Fffff Appendix H Sample Ladder Program Start 09Ð12Ð95 1321GE Fanuc Series 90Ð70 v6.01Page Overview Fstscn Const Ð+IN1 Q+Ð%R00145 Const Ð+PV CV+Ð INT Rdcrsw INT Wtcrsw Rderr Rsread Dowrt Lanifok Lanrdwr Main Bufferpool Index Index-2 GFK-1004B Index-3 Index-4 GFK-1004B Index-5 Index-6 GFK-1004B Index-7