Controlling Communications in the Ladder Program | GE GFK-1004B

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Section 5: Controlling Communications in the Ladder Program

This section provides tips on how to control communications in your ladder program. Only segments of actual ladder logic are included. For a sample of a complete working program, see Appendix D. Topics discussed are:

HEssential Elements of the Ladder Program

HTroubleshooting Your Ladder Program

HMonitoring Communications in the Ladder Program

HSequencing Communications Requests

Essential Elements of the Ladder Program

Every ladder program, whether in the developmental phase or the operational phase, should do the following before initiating a COMMREQ function.

1.Initiate the COMMREQ function with a one-shot transitional coil or contact. This prevents accidentally sending the same COMMREQ Command Block more than once.

2.Include at least the LAN Interface OK bit in the LAN Interface Status Word as an interlock contact for the COMMREQ function. You may choose to add more interlocks.

3.Zero the word location you specify for the COMMREQ Status (CRS) word, and OK and FT Outputs of the COMMREQ Function Block before the COMMREQ function is initiated.

4.Move the command code and parameters for the Channel Command into the memory location specified in IN input of the COMMREQ Function Block before the COMMREQ function is initiated.

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TCP/IP Ethernet Communications User's Manual ± January 1996

GFK-1004B

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GE GFK-1004B user manual Controlling Communications in the Ladder Program, Essential Elements of the Ladder Program

Contents

GE Fanuc Automation GFL±002 Content of this Manual Preface We Welcome Your Comments and Suggestions PrefaceRelated Publications 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 Ethernet Communications System Major Components of the TCP/IP LAN Ethernet Interface Capabilities of the Ethernet Interface Attachment of the Ethernet Interface to the LAN Introduction Ethernet Software GEnet System Manager GSM Downloader Configuration EditorAccess to the Station Manager on the Ethernet Interface How to Make it Work IBM PC PLC Tasks Where to go in the Manual Quick Guide to the Manual Chapter Installing the Ethernet Interface Ethernet Interface Hardware Overview Ethernet Controller Board Indicator Status Description Board IndicatorsEthernet Controller Board Indicators Restart Button Serial Port BatteryDefault Station Address Label AUI Transceiver Port Equipment Required to Perform the Installation Procedures Ethernet Controller Board Installation 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 Powering-Up the Ethernet Interface Ethernet Interface Online Problems During Power-Up LED Pattern Where Stopped Possible Cause Corrective Actions Installing the Ethernet Interface To configure the Ethernet Interface PLC Systems with CPU Firmware Version 5.03 or Later 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 Procedure 4 Configuring and Downloading a Station Configuring a Station When Must a Station Be Downloaded? Downloading a Station MAC Address Download Mode/ Load Source Loader State Initiating the DownloadLocal Downloading Ethernet Interface Network Downloading Problems During the DownloadHow to Issue the Load Command from the Station Manager Procedure 5 Testing the Ethernet Interfaces on the Network Field Network Test Utility 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 Primar y GSM functions are What is the GSM?Why Does a Station Have to be Configured and Downloaded? GSM also provides the following support functions Connecting the GSM to the LAN Interface Installing and Starting-Up the GSM Hardware Requirements Vendor Model Size PC Bus Width Installing the PC Network Card for Network GSM Operation3/Ethernet Cards for the PC Vendor Vendor Model Restrictions Default Hardware Settings Installing the GEnet System Manager GSM SoftwareDefault PC Hardware Settings for 802.3/Ethernet Cards Create a directory for the GSM by typing Network GSM Operation or Both Local and Network Setting-Up DOS System FilesLocal GSM Operation Exclusively When the GSM is the Only Ndis Application on the PC Checking for Existing Ndis Applications on Your PC When an Ndis Application Already Exists Network Card Driver Etherlinkii Changing the PC Network Card Unusual ProceduresUpdating or Adding to Existing GSM Software Starting-Up the GSM GSM Main Menu Working Your Way through the GSM Menus GSM Keyboard Keys Function GSM Keyboard FunctionsGSM Keyboard Functions Alt-K GSM Menu Structure GSM Menu Structure Configuring a Station Configure a Station Screen Creating a Station Configuration File Field Definitions for the Configure a Station Screen GEnet System Manager±Station Configuration Structure of the MAC Address Selecting a Station Configuration FileDeleting a Station Configuration File Configuration Editor Menu for Series 90-70 PLCs Configuration Editor Menu IP Address Address as Configured on the Screen TCP/IP Parameters Screen Determining If an IP Address Has Already Been Used Precedence of TCP/IP Parameter Sources Advanced Parameters Menu Advanced Parameters Menu Data Link Parameters Screen Data Link Parameters are defined as follows GFK-1004B System Parameters Screen Memor y Pool Allocation Parameters Ranges for the Buffer Pool Parameter values are Station Manager Parameters are as follows Downloading Locally Over the Serial Port Downloading a StationDownload Station Screen Downloading Over the Network System files integrated for Station Station Name Accessing the Station Manager Access Station Manager Screen Using the GSM Support Functions List All Stations Screen GFK-1004B Setup GSM Menu Changing the GSM Password Screen To Set the Download Mode Set Download Mode ScreenSet Station Manager Mode Screen To Set the Station Manager Mode Chapter ProgrammingCommunications Requests Communications Request Structure of the Communications Request Advantages of Channel Commands Commreq Command BlockChannel Commands Commreq FunctionBlock Status Data Operation of the Communications Request Domain of a TCP connection Domain of a channel Rack Slot Commreq Function Block and Command BlockCommreq FunctionBlock Commreq Command Block Type Value Description Decimal Hex Aborting and Re-tasking a Channel Channel CommandsEstablishing a Channel Retrieving Detailed Status on the Channel Specifying the Location of the Channel Status Dec Hex Example Command BlockEstablish Read Channel Time Unit Values for Read/Write Repetition Period Value Meaning Series 90-70 PLC Memory Types Value Type Decimal Description GFK-1004B Establish Write Channel GFK-1004B Programming Communications Requests Example Command Block Send Information Report Programming Communications Requests GFK-1004B Abort Channel Retrieve Detailed Channel Status Programming Communications Requests Assign Channel Status Vector Status Data Types of Status Data FT Output of the Commreq FunctionBlock Description of the Status DataOK Output of the Commreq FunctionBlock Status Bits Status Bits LIS Bits and Channel Status Bits Status Bits Brief Description Each channel has a dedicated pair of bits as follows Communications Status Words Format of the Commreq Status Word CRS Word Major Error Codes Error Status Major Error Description 85H at Client PLC Minor Error CodesError Status Service Request Error Description Minor Error Codes for Major Error Codes 5H and 85H Error Status Srtp Error Description Minor Error Codes for Major Error Code 90H at Client PLC Error Status Application Interface Error Description Controlling Communications in the Ladder Program Essential Elements of the Ladder Program Lanifok +ÐÐ Ððððð ÐÐÐ+BLKMV+Ð INT Commreq Status Word is Zero 0 and FT Output is OFF Troubleshooting Your Ladder ProgramFT Output is on Commreq Status Word is Not One Monitoring the Commreq Status Word Monitoring the Channel Error BitMonitoring the Communications Channel Monitoring the Data Transfer Bit Data Transfers with One Repetition ªBackplane Communications with PLC Fault Lost RequestºSequencing Communications Requests Station Manager Services Chapter Station Manager 802.3 LAN Accessing the Station Manager Using the GSM 802.3 LAN Accessing the Station Manager Using an Ascii Terminal Remote Operation of the Station Manager Using the Station Manager Command Description Using the Monitor CommandsMonitor Commands Using the Modify Commands Using the Monitor Commands to Troubleshoot the Network Date and Time Station Manager Command SyntaxModify Commands Numeric Values Task IdentificationDisplay Data Representation Task Identifiers Byte String Values IP Address Soft Switch Entry Utility Station Manager in Utility Programs Soft Switch Entry Utility Commands Command Restrictions Field Network Test Utility Field Network Test Utility Commands Control Characters Command DescriptionsCommand Input Processing Control Character Usual Keyboard Function Channel Command Chdate Command BPS CommandChbps Command Chltime Command Chsosw Command Load Source Parameters Parameter Value Description Chtime Command Soft Switch Default Value Clear Command Clsosw Command Help Command Date CommandEXS Command Typical Help command when you are logged in is shown below Load Command LOG Command Log Event Hexadecimal Cause Login CommandLog Event Definitions NET Command Logout CommandLtime Command Ping Command Node CommandOK Command Prog Command REM Command Report Command Interpretation of Test Results Repp Command Restart Command Show Command Parameter Description Default Value Configuration Parameters10. Configuration Parameters 10. Configuration Parameters Description Default Value IPConfigurationParameters Sosw Command Stat Command Stopp Command Stopt Command Tally Meaning Tally Command11. PLC Driver Tallies Tally c 12. Address Resolution Protocol ARP Driver Tallies Tally f 13. Channel API Tallies Tally h 14. Internet Protocol IP Tallies Tally 15. Internet Control Message Protocol Icmp Tallies Tally j Data Link Tallies part of Tally l MAC Layer Tallies part of Tally l 19. Transmission Control Protocol TCP Tallies Tally w Test Command Time Command Trace Command = trace Trace enabled for Minutes Remaining = Lenref Chapter Troubleshooting Overview Diagnostic Tool Description Reference Using this ChapterEthernet Interface Diagnostic Tools Troubleshooting What to do if you Cannot Solve the Problem Determining the State of the Ethernet Interface Power-Up State Power-Up StateSoft Switch Entry State Running Wait for Field Wait for PLC Diagnostic Field Network Test State Soft Switch Entry StateSoft Switch Entry State Field Network Test State Local Loader StateLoader State Over Local Serial Load Downloader Network Port Not on Operational State Troubleshooting When Status OK LED is OFFOperational State LED Indicators Possible Cause and Resolution Troubleshooting When the Status OK LED is onTroubleshooting with Online LED OFF Exception Log Event Definitions Exception Log Event Error CodesTroubleshooting with Online LED on Log Event Cause Log Event Code Possible Cause and Resolution 10. Exception Log Event Codes 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 Appendix Glossary Commonly Used Acronyms and Abbreviations Glossary of Terms Appendix a Glossary GFK-1004B Appendix a Glossary GFK-1004B Appendix a Glossary GFK-1004B What this Appendix Contains Serial Port SettingsSerial Port for Local GSM Communications Serial Port Pinouts Serial Cable Display Terminal SettingsPin Number Signal Description Table B-1. Pinouts of the Serial Port Table B-2. Pinouts of the AUI Port AUI Port for the Ethernet InterfaceEthernet AUI Port Pinouts AUI Transceiver Cable Transceiver Description Table B-3 Base5 Transceiver Configuration Appendix Soft Switch Parameters Config Mode Station Address Backplane Online Load SourceLAN Online Network Load Address Parameter Description Modify Soft Switch SettingsTable C-1. Soft Switch Settings Configuring Soft Switch Parameters Configuring Soft Switch Parameters Using the GSM Soft Switch Entry Utility Correct Results of Soft Switch Configuration Appendix Sample DOS System Files \CONFIG.SYS 3Com Etherlink 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 Table E-1. GEnet System Manager Data Link Error Codes Error Code Description Fmalloc error Table E-2. Ndis Error Codes Error Code Hexadecimal Description Appendix Network Test Form Test Form Network Test Data Sheet Init Node Resp Node Resp node AcceptableRate IP Addresses Figure G-1. IP Address Format for Network Classes A, B, C Gateways Range of first integer Class Figure G-3. Network Configuration Using a Subnet Mask Subnets 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 Index Bufferpool Index-2 GFK-1004B Index-3 Index-4 GFK-1004B Index-5 Index-6 GFK-1004B Index-7