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1. Fi F2 F3 Fa F5 Fe F7 F8 F9 F10 Program PLC m Programmer Program Program A i Reference Librarian i Print Display Control and z Mode and Folder Utility h and Edit Tables Status Functions Setup Functions Functions Functions Fi Fi Fi Fi Fi Fi A Load Setup Unsigned Run Stop Select 7 Insert F1 F1 from Printer Integer PLC Create PLC Parameters F2 F2 F2 F2 F2 F2 F2 F2 List Designate Set Store g Edit Signed Password Contents Programmer Delete to Screen Integer Protection of Mode PLC Print Library Device F3 F3 F3 F3 F3 F3 F3 Import Verif Double PLC Element Select Auto PLC Analyz Precision Fault To SNP Parallel Select With HF3 Integer Table Folder Connections Programmer F4 F4 F4 F4 F4 F4 F4 Import PLC L 1 0 Print Search Real Fault Plockoto Peer ee Backup F4 Progra a Redefine Setup ogie F5 F5 F5 F5 F5 F5 F5 F5 Export A Select PLC View Clear El t Cross Debug Hexadecimal Memory Fat Modes Restore PLC Reference Usage Library Setup Memory Opti
2. CTRL CTRI Cursor Move to the first or last row of the SFC network CTRL N key maintaining column position Or move to the first or last CTRL 1 column of the SFC network maintaining row position CTRL These keys are for INSERT and EDIT mode only PgUp and Page Up and Move six rows ata time up or down respectively The PgDn Page Down keys cursor is always positioned in column 1 of the row being moved to Home Home key Place the cursor on the start of the program block marker End End key Place the cursor on the end of the program block marker GFK 0854A Chapter 3 Sequential Function Chart Editor 3 17 Naming Steps Transitions and Connectors System names S1 through 59999 are reserved in an SFC block to be used as step names Similarly transition names T1 through T9999 are reserved for transitions and connector names C1 through C9999 are reserved for connectors You cannot use these names as reference nicknames label names or program block names These names 51 59999 T1 T9999 and C1 C9999 are system assigned and should not be confused with the user assigned names discussed in the last paragraph on this page Step and transition numbers are assigned in the order in which the steps or transitions are created Automatic names generated for these steps and transitions are based on the step and transition numbers However you can renumber every step and transition in an SFC block by pressing Mo
3. END OF TRANSITION I BEN pati TRN T2 TES Te REPLACE T2 n Note As noted on page 3 46 a search is performed in traversal order In executable topologies traversal order begins with the leftmost topmost step in the topology and continues along the branch of the topology following this step When a selective or simultaneous structure is encountered its branches are searched in left to right order Destination connectors are searched immediately before the steps they precede Source connectors are searched immediately after the transitions they follow In non executable topologies traversal order follows the left to right top to bottom ordering of SFC elements as they appear on the screen Goto The goto function enables you to quickly go to a specific step transition or connector in an SFC network To use this function you must first be positioned within the SFC network Enter the name of the specific step transition or connector on the command line and press the Goto F8 softkey from the Debug function keys If Goto F8 is pressed without entering a name on the command line and the programmer is ONLINE and EQUAL to the PLC the cursor will advance to the next active step in the SFC network Ending the Search To end the search and return to the top level of the SFC editor press the Escape key GFK 0854A Chapter 3 Sequential Function Chart Editor 3 51 Section 4 Comments 3 52 Step comments allow you
4. START OF TRANSITION TIT Program EXETST C 70FOLDER EXETST 4 6 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Sample Page of Block Cross References GE FANUC SERIES 90 DOCUMENTATION v5 00 Logicmaster SFC Logic Listing SM00001 If set to 1 no halting test HOLD 2 SM00002 Indicate the end of testing S lt END gt 1 R lt REDME gt 3 T00001 Continuation flag lt T10 gt 1 lt T11 gt 1 lt T12 gt 1 lt T13 gt 1 lt T14 gt 1 lt T15 gt 1 lt T16 gt 1 lt T17 gt 1 lt T20 gt 1 lt HOLD gt 1 lt REDME gt 2 lt OPEN gt 1 lt HOLD gt 2 lt RSET gt I HOLD 1 R00001 Base address of DEVLIB table FBIO lt REDME gt 1 SRO0004 Execution path selection FBIO lt T2 gt 1 T3 1 lt T4 gt 1 lt T5 gt 1 lt T6 gt 1 lt T7 gt 1 T8 1 lt T9 gt 1 lt T18 gt 1 lt T19 gt 1 lt REDME gt 1 NEXT 1 IDENTIFIER NAME CROSS REFERENCES 3 Efe K F F AAA PRPRPPRPRPRPEPER 3 RAR KRAKRAKAKAKAAAAAA 3 3 Program EXETST C 70FOLDER EXETST GFK 0854A Chapter 4 Printing SFC Blocks 4 7 Sample Page of Global Cross References M00001 M00002 T00001 RST_MSG RACKGEN RESET CBASE CNVCTRL GOTSG ALLSTOP T00002 RST_MSG RACKGEN CNVCTRL GOTSG ALLSTOP Program EXETST Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GE FANUC SERIES 90 DOCUMEN
5. For 90 30 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A 5 Terminal steps are allowed except when they occur within a simultaneous sequence A terminal step is one that is not followed by a transition Once a terminal step is activated it cannot be deactivated except by an SFC_RESET instruction For more information on the SFC_RESET function see page 3 58 In the following valid sequential function chart segment there is no transition after step 56 This would terminate the sequential function chart and step S6 would continue to execute every evolution as long as the block is active and the chart is not reset Example of a Valid SFC Segment back _ gt GFK 0854A Chapter 2 Understanding SFC Language 2 17 6 Ajump cannot jump into any branch of a simultaneous sequence In the following invalid sequential function chart segment there is a jump into a simultaneous sequence Logicmaster 90 software will indicate the program as non executable and will prevent it from being stored in the Series 90 70 PLC Example of an Invalid SFC Segment cycle cycle 7 Ajump cannot jump out of a branch within a simultaneous sequence 2 18 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A 8 Two divergent points of the same type of sequence simultaneous or selective may have a common convergent point Simi
6. Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A SFC Top Level Errors The following errors can occur at the main level of the SFC network They will be detected as you press the Escape key from that level The block will remain unexecutable until they are corrected e Two transitions directly connected e Two steps directly connected e Transition not preceded by a step e Transition not followed by a step or source connector e Step and source connector directly connected e Disconnected SFC segments Two or more sections of SFC networks are not connected by vertical links horizontal branches or connectors e Mismatched adjoining branch segments A selective branch segment adjoins as a parallel branch segment e Incomplete start of a simultaneous branch You must have a transition as well as a simultaneous branch e Incomplete end of a simultaneous branch You must have a transition as well as a simultaneous branch e Incomplete start of a selective branch You must have a transition as well as a selective branch e Incomplete end of a selective branch You must have a transition as well as a selective branch e More than one initial step e Initial step occurs inside a simultaneous control structure e Step or transition appears more than once in the SFC network e Missing destination connector e Multiple occurrences of the same destination connector e Missin
7. eeeeeooeeeeeooon 3 6 Programming SFC Step Action Logic 2 6 6 3 7 Selecting the Block s Language eeeee eee eee eee eens 3 8 Changing the Display Mode 1 6 0 6 cece eens 3 10 Section 2 Inserting Editing an SFC Network Topology 3 11 Grid Organization sih a e cee 3 15 Moving the Cursor ww w era aw ake eas eine ead ee be eaud maia weds ee need 3 17 Naming Steps Transitions and Connectors eeeeeeee 3 18 Inserting Editing an Example SFC Network eeeeeeeoeen 3 19 Deleting an Element neces 3 35 Open Delete Space Functions 0 0 0 sassarese rara eens 3 36 Exiting Insert or Edit Mode 6 1 6 6 3 44 Displaying Errors in the Network e eeeeeeeeeeeeeeeoon 3 44 Storing Changes to an SFC Block eeeeee eee eee eee eee eeen 3 45 GFK 0854A Series 90 Sequential Function Chart Programming Language User s Manual October 1994 v Contents Section 3 Search Function a a tie acento ase eee ages 3 46 Enabling the Search Function 666s 3 47 GOLO sie kone io be ses sede aa ee Bee a AEN ce Flatt ree he Be coe Sie See ed anata tee sande 3 51 Ending the Search bend a e a a a eee 3 51 Section 4 Comments 6 0 444 4 a es sae y ewa Ss kane EES 3 52 Section 5 Options Related to SFC Blocks 3 53 Fault Logging for Out of Limit Step Times eeeeoen 3 53 Configuring Multiple Languages eee ee eeeoeo or e eeeoon
8. function is used on a step with action logic or a transition with ladder diagram logic you must confirm the action The Erase Element function also deletes any related entries in the symbol table The step transition or connector name can then be used on another element Replacing an element with another element having a different name has the same effect as executing an erase element operation For example pressing the Step F2 softkey with a name on the command line will replace delete the current step with the newly defined step GFK 0854A Chapter 3 Sequential Function Chart Editor 3 35 Open Delete Space Functions The Open Row F3 and Open Column F4 softkeys can be used to expand individual branch sequences or move an entire network The Delete Row F6 and Delete Column F7 softkeys can be used to remove space from individual branch sequences or move an entire network Open Row The Open Row F3 function adds two rows immediately above the cursor location by moving the row that the cursor is on down two rows Two rows are added to maintain steps on even rows and transitions on odd rows The cursor remains at its original row location The last two rows rows 127 and 128 must be empty in order to use the open row function In the example on the following page the row containing step S5 is moved down two rows by positioning the cursor on step 55 and pressing the Open Row F3 softkey 3 36 Series 90 Sequential Function
9. of the Logicmaster 90 70 Programming Software User s Manual GFK 0263 or in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 In addition you can search for the following SFC elements even though no replacement is allowed e A step or step name lt stepname gt x lt stepname gt t lt stepname gt f e A transition or transition name e Aconnector name e An SFC language element amp istep initial step see pages 3 13 and 3 14 for a discussion of this and the other steps amp step regular step amp trans transition amp selbrch selective sequence amp simbrch simultaneous sequence amp verlnk vertical link amp srccnct source connector amp dstcnct destination connector A local search operates over all the SFC logic in the block even if it is invoked within a particular step or transition A global search initiated from an SFC topology will wrap to search the beginning of the block down to the original starting point The cursor position identifies the starting point of the search When the search is invoked it will start with the next SFC element in traversal order The search will continue and wrap around to include the starting point and its underlying logic A local search however begins at the specified position and does not wrap Note A backward search can only be executed on relay ladder diagram RLD blocks
10. 4 interrupts postprocessing logic B 4 preprocessing logic B 4 program block declarations start of program variable declarations mnemonics MS DOS 1 2 N Names reserved 3 18 Network displaying problems in the network 44 GFK 0854A GFK 0854A grid organization inserting editing an SFC network example O Open space functions 3 36 open column open row P Parallel control structure See Basic control structure Postprocessing logic b 4 B 6 Preprocessing logic B 4 yi Print function 4 1 action logic block cross references 1 global cross references preprocessing and postprocessing logic ea printing an SFC network table of contents transition logic 4 6 Program block options 3 53 print function action logic 4 5 block cross references 4 7 global cross references 4 8 preprocessing and postprocessing log ic 4 4 printing an SFC network 4 3 table of contents transition logic 4 Program block declarations 3 4 Program blocks changing the display mode configuring multiple lang eB delete space functions 3 36 a for out of limit step times 3 53 format of an SFC block grid organization inserting editing an SFC network example limitations Index loading from the PLC to the program mer markers open space functions 3 36 a and postprocessing logic 3 6 program utility aS programming SFC actions recording an eyolutio
11. 66 selecting the block s language 3 63 setting step time limits setting the time base SFC program blocks Index 1 Index Index 2 step comments stop mode store storing changes to an SFC block 3 45 storing to the PLC from the program nee run mode store stop mode store toggles and overrides 3 59 using debug functions nei goto cursoring function B 51 3 61 using the search function 3 46 verifying a program with the PLC B 67 Editor SFC See Editing a program block End of program B 4 Erase element 3 35 Errors common user general errors A 1 general SFC element errors A 2 logic errors SFC top level errors A 3 transition logic errors A 2 Evolution history of a block 3 60 Evolving the sequential function chart 2 7 MOU of sequential function charts 2 9 Execution modes controlling the execu tion mode with an SFC RESET F Fault bits B 3 Fault logging for out of limit step times 3 53 Flags G General errors A 1 Goto 51 5 6 Grid organization B 15 H Help screens History of a block 3 60 Initial step Inter rupts 3 4 Introduction J Jump 2 13 K Key functions tree display of key functions tree display of softkeys L Language configuring multiple lan guages Language selecting the block s B 8 Loading from the PLC to the programmer B 64 Logic 8 6 Logic errors A 2 Markers end of prog ram 3
12. 90 30 version of SFC When there are differences between the 90 30 and the 90 70 versions such as SFC subroutine capabilities these differences are noted in the sections discussing the features wherein they differ Additionally clarifications and corrections have been made where necessary Related Publications Series 90 70 Programmable Controller Installation Manual GFK 0262 Logicmaster 90 70 Programming Software User s Manual GFK 0263 Series 90 70 Programmable Controller Reference Manual GFK 0265 Series 90 30 Programmable Controller Installation Manual GFK 0356 Logicmaster 90 30 Programming Software User s Manual GFK 0466 Series 90 30 Programmable Controller Reference Manual GFK 0467 We Welcome Your Comments and Suggestions At GE Fanuc Automation we strive to produce quality technical documentation After you have used this manual please take a few moments to complete and return the Reader s Comment Card located on the next page Linda Edenfield Customer Documentation ProcessManager David Bruton Sr Technical Writer Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Contents Chapter 1 Introduction 54 ri pr ra t a ra e ri a ai a e aes 1 1 SEC Defined eor vaz ia 2 cet nan a aa tapi a ra E Seb maton dae inact 1 1 SFC in 90 30 and SFC in 90 70 Logicmaster eeeeeon 1 1 What You Will Need 6 eee cece 1 1 MS DOS Versi
13. GFK 0466 Configuring Multiple Languages GFK 0854A If you want all program blocks programmed in the same language either relay ladder diagram or sequential function chart you can set the multiple language option to a single language Then you will not have to select a language when you first enter a new block Note Even if you decide to program all your blocks in sequential function chart language you must still use relay ladder diagram for those portions of the SFC block where there is no choice of language e g preprocessing actions postprocessing actions transition logic and step action logic To change the block language configuration 1 Press the Options F7 softkey from the main level of the SFC or RLD Editor IEN TABLES STATUS LIB SETUP FOLDER UTILTY PRINT eoilckped opt pen e n on n n o gt PROGRAM EDITOR SETUP OPTIONS Fi Multiple Coil Use F2 Editor Options ID RUN OUT EN Zms SCAN MMONITORML4 ACC WRITE LOGIC LOGIC EQUAL NLMSON NEWL INE PRG NEWLINEMBLK _MAIN i 00001 CYCLE Chapter 3 Sequential Function Chart Editor 3 55 2 Then press the Editor Options F2 softkey eg TABLES STATUS LIB SETUP FOLDER UTILTY PRINT 1 2 e on men on on o o o gt EDITOR OPTIONS Automatically Insert References into Variable Declaration Table N Y N Automatically Create ZU ZUR References If No Reference Specified N Y N Block Language Choices for New Blocks ar
14. REDME lt lt RUNG 1 gt gt INT CONST IN Q PATH CONST IN Q BASE 00000 LEN 00700 LEN 100001 100001 END OF ACTION KKKKKKKKKKKKKKK EXPANSION OF STEP RSET KKKKKKKKKKKKKKK KESE SAE A SA 8 SAE A SAE eh S Ae a A SAE hy AN a A ae hy Rn hs te hy Goes E AE Pc A a a a E E A E E E E E E E EE ag GE This step calls a program block which clears all of the registers used in the program x ARIS I aae RI IG ae aaa ae ae IG I IG I a A A a IIS aa a ae aae aa a ae we a ae a ae a ae a BE a AR ARK a ae AE a RA RI RI KIRA aeaea Y START OF ACTION FOR STEP RSET lt lt RUNG 1 gt gt END OF ACTION Program EXETST C 70FOLDER EXETST Block MAIN GEK O854A Chapter 4 Printing SFC Blocks 4 5 Sample Transition Logic Page 02 16 94 10 38 GE FANUC SERIES 90 DOCUMENTATION v5 00 Logicmaster SFC Logic Listing KKK KKK AK KKK EXPANSION OF TRANSITION T8 KKRKKKK KKK KKK START OF TRANSITION T8 lt lt RUNG 1 gt gt PATH I1 CONST 12 00006 END OF TRANSITION KKK KKK KK KKK EXPANSION OF TRANSITION TQ KKKKKKKK AK KKK START OF TRANSITION T9 lt lt RUNG 1 gt gt PATH I1 CONST 12 00007 END OF TRANSITION KKK KKK KKK EXPANSION OF TRANSITION T10 KKK KK KK KKK START OF TRANSITION T10 lt lt RUNG 1 gt gt l l l l e END OF TRANSITION KKKKKKKKKKKKKKK EXPANSION OF TRANSITION T11 RRR KKK KKKKKKK KK
15. SFC logic will always search in traversal order even if a backward search is selected In executable topologies traversal order begins with the leftmost topmost step in the topology and continues along the branch of the topology following this step When a selective or simultaneous structure is encountered its branches are searched in left to right order Destination connectors are searched immediately before the steps they precede Source connectors are searched immediately after the transitions they follow In non executable topologies traversal order follows the left to right top to bottom ordering of SFC elements as they appear on the screen Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A Enabling the Search Function The Search function is accessed by pressing the Search F4 softkey from the SFC Editor function keys The following example illustrates how to use the Search function 1 Position the cursor on step S4 I TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit analuziksearchfsdebug Beconmnt ppt ionfitgoto hore tizoon gt PREPROCESSING LOGIC CYCLE gt NLM9ONNEUL INE ct Ton Se ores REPLACEBICAPS 00004 S4 zi GFK 0854A Chapter 3 Sequential Function Chart Editor 3 47 2 Press the Search F4 softkey to access the Search function and display the initial Search screen I TABLES STATUS LIB SETUP FOLDER UTIL
16. STORE will store every block in the program to the PLC In this type of store all SFC blocks are reset to their initial states This includes initializing step timers and resetting step f flags to OFF Note Storing the SFC block will cause all the SFC topology control bits to be cleared This will result in starting with the initial step when going to RUN mode The PLC memory reference tables will not be cleared unless you select this option on the Load Store screen GFK 0854A Chapter 3 Sequential Function Chart Editor 3 65 To initiate a STOP MODE STORE press Store F2 from the Program Utility Functions menu PROGRM TABLES STATUS LIB SETUP FOLDER gia PRINT E 25521 SIS MN SS C a an 5 Hef lash gt STORE FROM PROGRAMMER TO PLC Information to be stored CURRENT FOLDER NEUL INE oo PLC PROGRAM NAME NEWLINE PROGRAM LOGIC zP ZL CY N CONF IGURATION Y C N Total logic blocks to be stored REFERENCE TABLES N YN Current block being stored Logic blocks to be modified added deleted in PLC lt lt Press ENTER Key to Start Store Function gt gt ID STOP NO I0 ONLINE ML4 ACC WRITE LOGIC NLMSONNEWL INE PRG NEWLINE REPLACE Three types of data can be stored from the programmer to the PLC program logic configuration data and or reference tables When this screen is first displayed only the program logic is set to Y Yes this is the default selection All other fields default to N No To s
17. This process is referred to as evolving the sequential function chart The sequence of operations for any given sequential processing portion of the PLC scan is to 1 Evaluate the transitions following all active steps 2 Evolve the sequential function chart 3 Execute the action logic associated with the active steps The example Sequential Function Chart segment and example logic execution flow are used to illustrate how transitions and states become active in SFC evolution TI S g T2 S3 H w GFK 0854A Chapter 2 Understanding SFC Language 2 7 2 8 When an SFC block is initially executed the SFC is considered to be in the reset state The the initial step S1 becomes active and transition T1 becomes active The action logic associated with step 51 is then executed On the second scan the transition logic associated with active transition T1 is tested and found to be true Step S1 becomes inactive and transition T1 becomes inactive Step 52 becomes active and transition T2 becomes active The action logic associated with step S2 is then executed On the third scan the transition logic associated with active transition T2 is tested and found to be false Since the transition condition is not satisfied step S2 remains active and transition T2 remains active The action logic associated with step S2 is executed again On the fourth scan the transition logic associated with active transition T2 is again te
18. User s Manual GFK 0466 For information on 90 30 programming instructions and timing information refer to the Series 90 30 Programmable Controller Reference Manual GFK 0467 SFC Defined Sequential Function Chart SFC is a graphical state language which is IEC compliant SFC was specifically developed for controlling sequential processes SFC offers a graphical representation of the functions of a sequential automated system as a sequence of steps and transitions For a better understanding of what SFC does and the relationship between SFC and RLD read the first five pages of chapter 2 SFC in 90 30 and SFC in 90 70 Logicmaster Previously SFC was available only for users of Logicmaster 90 70 It is now available for the 90 30 product as well The places where the two differ are noted within this manual What You Will Need The Logicmaster 90 70 Programming Software User s Manual GFK 0263 lists the hardware and software required to run the Logicmaster 90 70 software packages The Logicmaster 90 30 Programming Software User s Manual GFK 0466 lists the hardware and software GFK 0854A 1 1 required to run the Logicmaster 90 30 software packages You should review this list in chapter 1 Introduction to make sure your system is compatible before attempting to load the software or start up your computer MS DOS Version In order to run Logicmaster software MS DOS Version 5 0 or later must be installed on your co
19. be currently running in order to turn the evolution history feature on but it does need to be running for updates Note The information about whether the SFC block will have its evolution history recorded is stored in the PLC only It is not stored within the current folder as part of the information about that block To display the following screen press the History Shift F7 softkey from the Debug function keys for the desired block DEBUG EST TIME 1 2 33073 en on en CO SFC EVOLUTION HISTORY FOR BLOCK _MAIN IS ON TIME NTWK ACTIVE STEPS 00 02 03 1 00 02 03 550 549 00 01 01 550 549 00 01 00 550 549 2ms SCAN L4 ACC WRITE LOGIC LOGIC EQUAL PRG NEWLINEMBLK _MAIN To enable the collection of evolution history of the current SFC block press On F1 When enabled a history of the last eight evolutions of the SFC block is recorded and displayed The most recent evolution is displayed first i e in the example screen above entry 8 occurred earlier in time than entry 1 Each evolution is time stamped i e the time at which each step for that evolution became active is recorded Note that this screen shows which steps became active at which time not which steps are active To disable the collection of evolution history press Off F2 To clear the evolution history press Clear F3 If a step exceeds its maximum time or does not attain its minimum time it will be marked in the evolutio
20. configuration For more information refer back to section 5 Options Related to SFC Blocks beginning on page 3 53 GFK 0854A Chapter 3 Sequential Function Chart Editor 3 63 Single Sweep Debug In the 90 70 SFC Single Sweep scan Debug allows you to stop the PLC to view or monitor the program after one sweep by pressing ALT G ALT G may be used while viewing the program reference tables PLC fault table or 1 O fault table To use this feature the programmer must be in ONLINE mode and the PLC must be in STOP IOSCAN mode If the PLC isin RUN mode press ALT R to toggle the PLC mode to STOP orselect STOP mode from the Run Stop PLC screen using the status functions To perform a first scan type 0 on the command line before pressing ALT G If the command line is blank or 1 is entered on the command line a non first scan single sweep debug is performed When the PLC is running sweeps in single sweep mode timers do not increment You will have to force a value into the timer s CV register to make the timer time out Note Single Sweep Debug is available only in the 90 70 SFC not the 90 30 3 64 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Section 7 Program Utility Functions Loading from the PLC to the Programmer Programs containing SFC blocks can be loaded from the PLC to Logicmaster 90 software the same as programs without SFC blocks For information on the load fun
21. cursor will be positioned at that error In INSERT or EDIT mode the network will also be checked for errors when you press the Escape key to accept the network e The analyze function can also be used to check the validity of a step or transition when accepting Relay Ladder Diagram RLD logic in a step or transition This check will automatically be performed when you press the Escape key to accept the action logic The first error found will be displayed For example this type error will occur if you attempt to accept a transition with no logic When you zoom out of an SFC block a complete analysis of the SFC network in the block is performed automatically If any errors are found a message identifying the SFC network that contains the error will be displayed You do not have to correct any errors before you exit an edit or insert session however an SFC block that contains errors is not executable and cannot be stored to the PLC 3 44 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Storing Changes to an SFC Block Changes to an SFC block are automatically stored to disk when you 1 Zoom into lower levels of the block Escape back to higher levels of the block Press the Escape key again to exit from INSERT or EDIT mode Press ALT U to force a store to disk ALT U may be pressed at any time M A YS ON Press ALT S to store to a PLC available in BLOCK EDIT mode only For 90 70
22. is START OF SFC PROGRAM PRGNAME VARIABLE DECLARATIONS BLOCK DECLARATIONS ERRUPTS ESSING LOGIC lt SFC Network goes here ESSING LOGIC F PROGRAM Subordinate SFC Block Format 90 70 Only The general format of a subordinate program block programmed in SFC language is START OF SFC BLOCK BLKNAME VARIABLE DECLARATIONS PREPROCESSING LOGIC lt SFC Network goes here POSTPROCESSING LOGIC END OF BLOCK Note Remember subordinate SFC program blocks are not available with the 90 30 software The START OF PROGRAM VARIABLE DECLARATIONS BLOCK DECLARATIONS INTERRUPTS and END OF PROGRAM markers are identical in function to those used in ladder diagram language For more information on these markers refer to the Logicmaster 90 Programming Software User s Manual Only the PREPROCESSING LOGIC and POSTPROCESSING LOGIC markers are unique to sequential function chart language These markers are described in the following table Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GEK O854A Marker Description PreprocessingLogic Preprocessing logicis executed each time the program block is called prior to the evolution of the sequential function charts This logic is optional but if desired it must be programmed ina terminal language suchas relay ladder diagram Read only access to the sequential function chart
23. odd numbered rows The cursor would advance to the next row even if your attempt to enter the transition failed 3 Press the F1 softkey to enter an initial step ZEN 2 3 4 5 Ja si Juoyam10 gt INTERRUPTS 1 PREPROCESSING LOGIC POSTPROCESSING LOGIC NLM9ONNEUL INE ze PA OM SOMME aran REPLACE 00001 S1 i The default step name S1 is automatically entered by the Logicmaster software GFK 0854A Chapter 3 Sequential Function Chart Editor 3 21 3 22 If you enter another name on the command line the software will check to see if the name is available and apply it instead of the default name 51 For more information on naming steps see page 3 18 4 After entering the initial step continue creating the SFC network or press the Zoom F10 softkey to program the step A valid SFC network must have one initial step 5 After the step is entered in the SFC network the cursor remains on the element You can enter a different type of step zoom into the step delete the step enter a transition or enter a branch element If you enter a transition by pressing the F4 softkey the transition is entered and the cursor is automatically advanced as shown below tr NIL H omnmt more if INTERRUPTS PREPROCESSING LOGIC Ti POSTPROCESSING LOGIC 1 NLM9ONNEUL INE Fr NE Na KOUN SOMES Denese REPLACE 00001 The transition is also assigned a name by the Logicmaster software For
24. sa GFK 0854A Chapter 3 Sequential Function Chart Editor 3 19 3 20 2 Press Insert F1 to create a new SFC network or press Edit F2 to edit an existing SFC network When Insert F1 is pressed the following screen is displayed l l l lo U ET O n SIL Jo O PREPROCESSING LOGIC POSTPROCESSING LOGIC END OF PROGRAM NLM9ONNEUL INE ni BLK MAIN EE AA REPLACE Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A The function keys display the basic SFC elements You can also enter one of these SFC elements by entering its mnemonic on the command line Table 3 2 SFC Mnemonics Mnemonic Name amp istep Initialstep amp step Regularstep amp trans Transition amp verlnk Verticallink amp selbrch Selectivelink amp simbrch Simultaneouslink amp srecnet Source connector amp dstcnct Destinationconnector Odd numbered rows e g first third fifth etc on an SFC network are transition rows Even numbered rows e g second fourth sixth etc are step rows The current position of the cursor is listed in the status line on the previous screen as row 2 column 2 This indicates that a step element can be entered at this location Ifa transition is entered the Logicmaster 90 software would attempt to enter the element on row 3 below the current cursor position because transitions are only entered on
25. step flags is provided as well as access to any reference nicknames declared in the variable declarations table The amount of logic that can be programmed is limited only by the size of the program block PostprocessingLogic Postprocessing logic functions the same as preprocessing logic except that postprocessing logic is executed after the evolution of the sequential function charts that is after all action logic is executed but before the program block is exited Note The actual SFC logic in an SFC program block will occur after the preprocessing actions and before the postprocessing actions GFK 0854A Chapter 3 Sequential Function Chart Editor 3 5 Preprocessing and Postprocessing Logic The sequential function chart block contains two marker rungs named PREPROCESSING LOGIC and POSTPROCESSING LOGIC These marker rungs enable you to access the logic that precedes and follows each SFC evolution To insert or edit this logic you can move the cursor to the selected marker rung and press the Zoom F10 softkey In the following example screen the cursor is positioned on the POSTPROCESSING LOGIC L TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit analuzikiscarchikdebug iconnntfgoptionliyoto more o gt CYCLE gt gt CYCLE POSTPROCESSING LOGIC I NLM9ONNEUL INE pas eC Jou monn 3 6 Series 90 Sequential Function Chart Programming Language User
26. steps They are represented graphically as shown below DI Initial step Regular step The initialstep is executed the first time the SFC block is executed or as a result of SFC RESET For more information on using the SFC RESET function to reset the SFC to its initial step see page 3 58 There can be one and only one initial step per SFC network The initial step cannot appear within a simultaneous construct but it may appear anywhere else A regular step is executed if the transitional logic in the SFC network makes the step active therefore there can be one or many regular steps in an SFC network Initial steps are constructed with double horizontal lines and double vertical side lines Regular steps use single horizontal lines and single vertical side lines Step Action Logic Each step may have action logic consisting of zero or more rungs programmed in Relay Ladder Diagram RLD logic language Action Logic is the logic associated with a step i e the logic programmed by RLD logic language that is executed when the step is active Note When a step becomes inactive its action logic is executed one final time without power flow This sets the coils in the logic to their default state i e a normally open coil defaults to OF while a normally closed coil defaults to ON GFK 0854A Chapter 2 Understanding SFC Language 2 3 Transitions Transition logic is programmed in Relay Ladder Diagram RLD logic Each tr
27. time limit is set for a step a step f flag is set whenever the step time is outside the limits In addition if you enable the fault logging option the PLC will log a fault in the PLC fault table when this occurs To enable the fault logging option press I O F1 to enter the I O configuration from the Logicmaster 90 configuration software 1 Inthe configuration software use the cursor keys to position the cursor on slot 1 of rack 0 Slot 1 contains the CPU module IZ COPY REF VU DELETE UNDEL CFGSEL l l IEN Ae a a E a a o J o gt I AC 16 PCM ale tig Ref Adr 64 KB I D NLMSONNEUL INE pati ONFIG VALID REPLACE Note The sample screens are from the 90 70 software The process is the same for the 90 30 GFK 0854A Chapter 3 Sequential Function Chart Editor 3 53 2 Press Zoom F10 to zoom into the CPU detail screen fack SOU 2 SS men e con OR OST Om gt SERIES 90 70 MODULE IN RACK 7 SLOT SOFTWARE CONFIGURATION Catalog p ro ylrg 771 CPU EXPANDABLE MEM IOScan Stop NO Baud Rate Passwords ENABLED Parity ODD Tmr Faults DISABLED Stop Bits 1 Data Bits 8 Modem TT 0 1 100 Second 7 Count Idle Time 10 Seconds Mode SNP Watchdg Tmr 200 msec The parameters on next page are supported by PLC Rev 4 0 or higher If PLC Firmware version is less than 4 0 do not modify then lt lt More Config Data Exists PgDn for Next Page PgUp for Previous Page
28. was not set e More than one regular rung e Less than one regular rung Transition Logic Step Action Logic and Preprocessing Postprocessing Logic Errors The following error conditions will be detected when you press the Escape key to exit from a transition logic section an action logic section or a preprocessing or postprocessing logic section The SFC block will remain unexecutable until these errors are corrected e AJump label name is used in another relay ladder diagram logic section in this block e AnMCR END_MCR name is used in another relay ladder diagram logic section in this block The following error conditions must be corrected immediately e Abackwards MCR jump e Too many nested FORs e Too many EXIT_FORs e Attempting to flow more than 16 bytes of data between function blocks instructions You can use registers on the output of one function block and the input of the next function block instruction instead General SFC Element Errors The following errors will be detected at entry and must be corrected immediately e Attempting to enter a step transition or connector in the wrong row e Attempting to cursor off a connector before naming it e For the 90 70 attempting to add more than 255 steps 383 transitions or 255 unique connectors For the 90 30 attempting to add more than 95 steps 95 transitions or 255 unique connectors e Attempting to extend the SFC network beyond 128 rows or 8 columns
29. 3 and the Logicmaster 90 30 Programming Software User s Manual GFK 0466 lists the keyboard functions that are active in the Logicmaster software environment Appendix E also contains a perforated card which can be removed from this manual Softkey Directory The display on the facing page shows the keys available to you in SFC programming Notice that the Logicmaster softkeys keystrokes to functions are the same except for those accessed through the Program Display and Edit softkey When going from the first F1 the Program Display and Edit softkey to the SFC keys you may be prompted to choose SFC or RLD programming if you are adding a new subroutine or if you just created a new folder Of course you will need to create a new folder if you are starting a new program Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A While attempting to display graphically the general structure of the SFC functions and their activating keystrokes this display is not intended to encompass every possible keystroke option you may encounter but rather it is intended to provide you with an overview of the general pattern of what is available and how to find it MAIN MENU a45434
30. AEN INE oua PC SORES nn REPLACE F GFK 0854A Chapter 3 Sequential Function Chart Editor 3 39 3 40 Delete Row The Delete Row F6 function removes the row at the cursor location and the next row The cursor remains at its original row location and all branches are shortened in order to maintain control structures In the example on the following page the row containing step S5 and the one below are deleted by positioning the cursor on step 55 and pressing the Delete Row F6 softkey Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A GFK 0854A Before il popen 1 20 ot ki a erase aan OEE lemt l ou Zan D NLM9ONNEYL INE zo REPLACE 00005 After gt Mi li li 55 erase aan OEE lemt li ou reco p NLMIJONNEUL INE Chapter 3 Sequential Function Chart Editor BLK _MAIN 58 ENA Siete 9 ENA Bias 9 a ay a BLK MAIN MSIZE S06MROOG6 iC4 iN1 SIZE 898MROO6iC4iN1 3 41 3 42 Delete Column The Delete Column F7 function deletes the column at the cursor position by moving the column that the cursor is on to the left one position The cursor remains at its original column location and all branches are shortened in order to maintain control structures Note All elements in the entire column occupied by the cursor will be deleted In the example on the following page the column
31. Chart Programming LanguageUser s Manual October 1994 GFK 0854A Before eee yey erase gan GGS IWA 1 2 gt rou K l lemt l ou Zan inetwrkliEnore sal D NLMSONNEUL INE zo TO Jenn oa REPLACE 00005 S5 Er After le jopen Seem Weta OGE UNEA 1 2 gt rou 4 SAGU Ogan ygol BY 9 aya itz 53 54 55 siz T3 T4 T5 T6 0 D NLMSONNEUL INE a Ton SETS II IN REPLACE z GFK 0854A Chapter 3 Sequential Function Chart Editor 3 37 3 38 Open Column The Open Column F4 function adds a column at the cursor position by moving the column that the cursor is on to the right one position The cursor remains at its original column location and all branches are extended in order to maintain control structures All elements to the right of the cursor will be moved The last column must be empty in order to use the open column function In the example on the following page the column containing step 55 is moved right one column by positioning the cursor on step 55 and pressing the Open Column F4 softkey Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Before eee yey erase gan GGS IWA 1 2 gt rou K l lemt l ou Zan inetwrkliEnore sal D NLMSONNEUL INE zo TO Jenn oa REPLACE 90005 5 T After Eg Soom OGE l nalyz l 1 2 gt 3i 4 SAGU Oga ygol tanetwrki ore d 513 T8 0 DEN
32. FANUC GE Fanuc Automation Programmable Control Products Series 90 Sequential Function Chart Programming Language User s Manual GFKO854A October 1994 GFL 002 Warnings Cautions and Notes as Used in this Publication Warning notices are used in this publication to emphasize that hazardous voltages currents temperatures or other conditions that could cause personal injury exist in this equipment or may be associated with its use In situations where inattention could cause either personal injury or damage to equipment a Warning notice is used Caution notices are used where equipment might be damaged if care is not taken Note Notes merely call attention to information that is especially significant to understanding and operating the equipment This document is based on information available at the time of its publication While efforts have been made to be accurate the information contained herein does not purport to cover all details or variations in hardware or software nor to provide for every possible contingency in connection with installation operation or maintenance Features may be described herein which are not present in all hardware and software systems GE Fanuc Automation assumes no obligation of notice to holders of this document with respect to changes subsequently made GE Fanuc Automation makes no representation or warranty expressed implied or statutory with respect to and assumes no respon
33. PTS PREPROCESSING LOGIC POSTPROCESSING LOGIC NLM9ONNEUL INE cal m KOUN SOMES JENN REPLACE Note The Erase Element function press More F9 to display this key or ALT D can also be used to remove any SFC element For more information about deleting an element see page 3 35 3 24 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A 8 To complete moving the branch below the transition T1 cursor down to the transition row and press Simultaneous Branch F7 The cursor automatically advances to the right IOo BEIN E EC E E EEEo t INTERRUPTS PREPROCESSING LOGIC POSTPROCESSING LOGIC EEN ni on EKDJGON J E REPLACE 9 To continue the branch press the Simultaneous Branch F7 softkey ZEI 2 3 4 5 H Ja si more 10 INTERRUPTS PREPROCESSING LOGIC POSTPROCESSING LOGIC D NLM9ONNEUL INE col on OM Se TOE REPLACE GFK 0854A Chapter 3 Sequential Function Chart Editor 3 25 You are now ready to begin programming the three simultaneous paths that have been created Note You do not have to enter all the logic in a top down entry order You can cursor down and develop some logic that would follow the convergence of this branch for example and then connect the logic after completing the simultaneous logic 10 Press the Step F2 softkey to add a step below the branch connector This new step is positioned in the rightm
34. Press F2 to enter a regular step in an SFC 2 3 network A regular step is a step which mustbe programmed using action logic in written relay ladder diagram logic F4 Transition amp trans Press F4 to enter a transition in an SFC 2 4 network F5 Vertical Link amp verlnk Press F5 to enter a vertical link F6 Selective amp selbrch Press F6 to enter a selective sequence 2 10 Sequence F7 Simultaneous amp simbrch Press F7 to enter a simultaneous parallel 2 11 Sequence sequence F8 Comment amp commnt Press F8 to enter a comment Comments 3 52 can only be placed on step instructions F9 More Press F 9 to display additional SFC elements or options you can select F10 Zoom Press F10 to zoom into a step or transi tion When you zoom into a step you can view the action logic associated with that step When you zoom into a transition you can view the logic associated with thattransition Chapter 3 Sequential Function Chart Editor 3 13 When More F9 is pressed these additional softkey assignments are displayed open l Mi ben szeg EGF elete HENA AG byen co me turkmmore ral Function See Key Function Mnemonic Description Page Pressing More F 9 displays these additional elements FI Destination amp dstcnct Press F1 to enter a destination connector 2 13 Connector You must enter a name for the destination connector before the cursor can be moved F2 So
35. TATION v5 00 Logicmaster SFC Logic Listing NOHLT If set to 1 no halting test HOLD 2 DONE Indicate the end of testing END gt 1 REDME gt 3 REF DESCRIPTION CROSS REFERENCES CONT Continuation flag lt T10 gt 1 lt T11 gt 1 lt T12 gt 1 lt TIG L ELGS TRIS 1 lt lt REDME gt 2 OPEN 1 HOLD 2 lt RSET gt 1 HOLD 1 lt 513 gt 3 lt S10 gt 3 lt S3 gt lt S7 gt lt S5 gt lt S5 gt lt S3 gt 4 status flag SI 2 lt S2 gt 3 6 9 lt S3 gt 2 lt 512 gt 2 S5 2 lt S9 gt lt S6 gt 2 lt S11 gt 2 lt S7 gt 2 lt S13 gt 2 lt Si gt TE 4625 2 5 8 4835 1 lt S12 gt 1 S5 1 lt S9 gt lt S6 gt 1 SII 1 STD 1 lt 513 gt l Sale STD SI STD SI SI SI lt S6 gt SI lt S6 gt SI lt S lt s lt 5 lt S lt S lt 58 gt 2 sp 2 lt S8 gt lt S9 gt 1 lt S2 gt 2 lt S3 gt 3 lt S2 gt lt S3 gt 2 aS7 gt 3 ST 2 lt S2 gt 2 lt S3 gt lt S2 gt lt S3 gt lt S2 gt lt S3 gt lt S2 gt lt S3 gt lt S2 gt lt S3 gt lt S2 gt lt S3 gt NWNWNHWHENNWEHENFEFENN C 70FOLDER EXETST lt S2 gt 3 6 lt S3 gt 2 RS2 gt 2 09 AZIR 1 T13 gt 1 T14 1 T20 gt 1 lt HOLD gt 1 lt S8 gt 2 lt S4 gt 2 lt S8 gt 1 lt S4 gt 1 lt S4 gt 2 lt 85 gt 2 lt 66 gt lt S10 gt 2 lt S4 gt 1 85 IS G lt S10 lt S2 gt 2 4 6 lt S3
36. TY PRINT linsertfzedit analuziksearchisdebug Baconmnt ppt ionfiigoto hore tizoon gt SEARCH Search for En Replace With Scope LOCAL LOCAL GLOBAL Usage EXPLICIT EXPLICIT IMPLICIT Prompt NO YES NO Direction FORWARD FORWARD BACKWARD Start From CURRENT CURRENT TOP BOTTOM Press Enter key to begin search function lt lt Press Esc key to exit search screen gt gt 1 NLMSONNEWL INE Pre MOULIN BLK MAIN MSIZE 519MROO4iCZiN1 IREPLACE De 3 48 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A 3 For this example the connector CYCLE is the desired search target Enter the word CYCLE inthe Search for field Z TABLES STATUS LIB SETUP FOLDER UTILTY PRINT Icni an SIN 45 SSA commt joption igoto SIN 0ZTTI gt SEARCH Search for Wonn Replace With Scope LOCAL LOCAL GLOBAL Usage EXPLICIT CEXPLICIT IMPLICIT Prompt NO YES NO Direction FORWARD FORWARD BACKWARD Start From CURRENT CURRENT TOP BOTTOM lt lt Press Enter key to begin search function gt gt lt lt Press Esc key to exit search screen gt gt D SLMSONNEWL INE cas Th SG Ian REPLACE 90001 CYCLE 4 Press the Enter key to initiate the search for the target CYCLE The target is located within the sequential function chart e TABLES STATUS LIB SETUP FOLDER UTILTY PRINT insertigasdit En
37. a simultaneous se quence divergence wa a selective sequence 2 10 Mi ov of a simultaneous sequence 2 11 examples rules simple sequence Blocks program See Program blocks Branches 2 10 See also Basic control structures C Comments Connectors 2 13 2 13 3 30 destination oe onpil B source connector 3 B 30 Control structures See Basic control struc tures Convergence of a selective sequence Convergence of a simultaneous sequence b 13 CTRL keys Cursor Cursor keys Index Cycle Debug kil bel 3 57 goto 8 51 B 61 AA ad pe 7 history ofa block 3 setting step a limits setting the time base toggles and overrides 3 5 Delete element 3 35 Delete space functions delete column delete row Destination connector Display mode normal 3 a number Divergence of a selective sequence Divergence of a simultaneous sequence pin E Editing a program Bae block limitations 3 2 changing the display madep i n configuring multiple lan pguges B55 delete space functions 236 Mo ging for out of ao step times 3 53 grid organization B 15 inserting editing an SFC network example 3 19 loading from the PLC to the program mer 3 65 open space functions 8 36 options 8 53 ay and postprocessing logic 3 6 program utility functions 3 65 programming SFC actions recording an evolution history of a block run mode store B
38. a step and indicating the conditions that must be fulfilled before advancing to the next step To observe some of the differences between SFC and RLD compare the diagram represented above to the one shown on page 2 5 Sequential Function Chart SFC is a method specifically developed for describing industrial sequential control systems SFC is a graphic method which represents the functions of a sequential automated system as a sequence of steps and transitions Each step represents commands or actions that are either active or inactive The flow of control passes from one step to the next through a conditional transition that is either true 1 or false 0 If the transition condition is true 1 indicated by setting the transition variable control passes from the current step which becomes inactive to the next step which then becomes active Each control function can therefore be represented by a group of steps and transitions called a Sequential Function Chart SFC The next two pages demonstrate the steps and transitions required to program the same logic shown in the diagram above using SFC instead of RLD The third page shows the final SFC diagram which as mentioned above should be compared and contrasted to the diagram shown above Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Steps Two types of steps may be used in a sequential function chart initial steps and regular
39. ansition must contain a rung that ends with a coil to set its transition variable i e the name of the transition such as T1 The following example shows how the transition conditions conceptually replace their associated transitions T1 and T2 in the sequential function chart displayed above i e the first one represents the transition conditions associated with T1 the second one between S2 and S3 representing the transition conditions associated with T2 100018 Q00900 LI KA Q001234 Mi Do not confuse T1 as used in these examples to represent Transition 1 with 6 TI used in Logicmaster to represent a temporary coil 2 4 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Example Consider again the semi automatic punch in the example on pages 2 1 through 2 2 It can be represented as an SFC as shown below cycle Initial step WAIT contains action logic to wait until the punch is at rest in the raised position At T1 the Start pushbutton is pressed and the punch is in the high position The DESCEND step contains action logic to lower the punch T2 represents the low position The RAISE step contains action logic to raise the punch T3 represents the high position cycle In the example above the initial step WAIT is represented by a square drawn with double lines It contains action logic that
40. blocks may however be collected from the RLD logic of an SFC block A block programmed in sequential function chart language includes the sequential function chart itself and all the logic contained in each step s logic each transition s logic and the preprocessing and postprocessing logic For the 90 70 an SFC block may contain a maximum of 255 steps 383 transitions and 255 unique connectors For the 90 30 an SFC block may contain a maximum of 95 steps 95 transitions and 255 unique connectors The size of a logic block is restricted to 16 kilobytes For an SFC block this includes the SFC topology and all associated actions and relay ladder diagram logic Note Applicable to 90 70 only Because of the 16 kilobyte size restriction and network complexity limitations it may not be possible to fit the logic for all the steps into a single block You can avoid this problem by placing the logic for each step in a separate block and have the only logic associated with the step be a call to the block The following list summarizes the limits placed on a block programmed in sequential function chart language 16 kilobytes of logic space An SFC network There can be one and only one SFC network per block 255 steps for the 90 70 95 steps for the 90 30 383 transitions for the 90 70 95 transitions for the 90 30 255 unique connectors 32 simultaneous parallel branches 32 simultaneously active steps 64 calls SFC grid size of 128
41. c and Preprocessing Bstprocessing Logic Errors 00 cece eee A 2 General SFC Element Errors 0 0 eee eee A 2 SFC Top Level Errors 2 3 3 casawis st nee aed wan AAEE ea eT aN ae Reena A 3 GFK 0854A Series 90 Sequential Function Chart Programming Language User s Manual October 1994 vi Chapter Introduction 1 Logicmaster 90 programming software is used to configure and program the Series 90 programmable controllers In most cases programming is done using Relay Ladder Diagram RLD logic to create an application program for the PLC Now you can optionally choose to program your logic in Sequential Function Chart SFC language This manual explains how to use Sequential Function Chart SFC language with Logicmaster 90 70 or Logicmaster 90 30 software to program your logic and create an application program for your programmable controller This manual does not attempt to describe the other features and functions of Logicmaster 90 70 or 90 30 software For information on the features and functions of the 90 70 software please refer to the Logicmaster 90 70 Programming Software User s Manual GFK 0263 For information on programming instructions and timing information pertaining to the 90 70 software refer to the Series 90 70 Programmable Controller Reference Manual GFK 0265 For information on the features and functions of the 90 30 software please refer to the Logicmaster 90 30 Programming Software
42. can be passed but unlike the selective sequence in a simultaneous divergent branch more than one step can become active In a divergent simultaneous sequence control passes from step 523 to step 24 and step 525 only if step 523 is active and transition T6 evaluates true Both steps will become active although the action logic contained in one step will be executed before the action logic in the other step The order of which step is executed first is undefined A simultaneous divergent branch must be preceded by one transition A step must be the first element after a simultaneous branch GFK 0854A Chapter 2 Understanding SFC Language 2 11 Convergence of a Simultaneous Sequence A simultaneous convergent branch can only be preceded by step elements It must be followed by one transition In a convergent simultaneous sequence control passes from step 533 and step S34 to step 535 only if steps S33 and 534 are both active and transition T7 evaluates true The transition logic for T7 is only executed when all of the steps at the end of the simultaneous sequence are active 2 12 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Source and Destination Connectors Source and destination connectors are used to create forward and backward jumps ina sequential function chart The words jump and cycle denote connectors in the sequential function chart shown below Backward jumps are call
43. ck EN is the only required input the OVR input is optional When EN is active the SFC_RESET function causes the SFC block to begin at the initial step Step timers are initialized and step f bits are set to OFE When OVR is active overrides are cleared Note Step t step f and step x values are cleared when an SFC_RESET function is executed When a reset request is received it is sent to the SFC interpreter The next time the SFC interpreter is invoked to evolve the SFC network all currently active steps are deactivated This causes all the action logic associated with the active steps to be executed without power flow Then the SFC network will evolve to a state of having its initial step activated and the activated logic will be executed Parameters Parameter Description EN When the function is enabled the operation is performed OVR OVR clears SFC override bits Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A Toggles and Overrides If Logicmaster 90 software is ONLINE and EQUAL to the PLC transitions can be toggled and overridden the same as contacts and coils in relay ladder diagram language To change the state of a transition position the cursor on the transition to be changed and press either the Toggle F5 softkey from the Debug function keys the F12 function key or the keypad key If the step was previously active it will become inact
44. containing step 55 is deleted by positioning the cursor on step 55 and pressing the Delete Column F7 softkey Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Before ea yew erase gan OGS IWA 1 2 gt 3ga Mi l lemt li ou reco Ene turk more l D NLM9ONNEUYL INE BLK MAIN MSIZE O e REPLACE 0000 Li After ea jjopen erase RE GGS IWA 1 2 gt frou li li lemt l ow col Byes more ral D NLMSONNEUL INE zat Tn Jane oa REPLACE 00012 S12 T GFK 0854A Chapter 3 Sequential Function Chart Editor 3 43 Exiting Insert or Edit Mode To exit INSERT or EDIT mode and save the SFC network press the Escape key or the Enter Accept key Error messages or warnings pertaining to the network will be displayed and the cursor will be positioned at the location of the first error found in the SFC network Displaying Errors in the Network Errors in the SFC network can be identified and displayed using one of the following methods e Atthe command level you can press the Analyze F3 function softkey to check the validity of the SFC network and the executability of the block The first three errors that are detected will be displayed and the cursor will be positioned at the first error e In INSERT or EDIT mode press More F9 and then Analyze Network F8 to check the validity of the SFC network The first error detected will be displayed and the
45. ction with the 90 70 software refer to chapter 9 Program Utilities in the Logicmaster 90 70 Programming Software User s Manual GFK 0263 For 90 30 users refer to chapter 8 Program Utilities in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 Storing to the PLC from the Programmer The store function is used to copy program logic configuration data and or reference tables from the programmer to the PLC Only configuration data may be stored from the configuration software Stop Mode Store The STOP MODE STORE of a program containing SFC blocks is similar to storing a program without SFC blocks For information on the store function with the 90 70 software refer to chapter 9 Program Utilities in the Logicmaster 90 70 Programming Software User s Manual GFK 0263 For 90 30 users refer to chapter 8 Program Utilities in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 The Logicmaster software must first determine whether the current program contains any SFC blocks and if it does whether the SFC blocks are supported by the current version of the SFC interpreter on the PLC If one of the SFC blocks is not supported by the current version of the SFC interpreter the store will not be allowed If all the blocks are supported the STOP MODE STORE will proceed For the 90 30 software the process is the same except that only the _MAIN block can be SFC A full STOP MODE
46. ctors 2 13 step 2 3 top level editor function keys B 11 f transition SFC editor See Editing a program block SFC_RESET Simple sequence 2 10 Simultaneous control structure See Basic control structures Software installing the software Source connector 2 13 Start of program 3 4 Step names 3 18 Step rows 3 21 Steps 2 3 action qualifier fault logging for out of limit step times oath initial step 2 3 minimum and maximum step times 1 names programming SFC actions regular pe step rows toggles and overrides 3 59 Stop mode store B 65 Storing to the PLC from the programmer B65 Structure See Basic control structures T Time values minimum and maximum step times B 3 3 62 Transition logic errors A 2 Transition names 3 18 Transition rows 3 21 Transitions 2 4 names toggles and overrides 3 59 transition rows Troubleshooting A 1 displaying problems in the network 4 general errors A 1 general SFC element errors A 2 logic errors SFC top level errors A 3 transition logic errors U Utility functions B 65 loading from the PLC to the program mer storing to the PLC from the program mer B65 verifying a program with the PLC B 67 B 67 V Variable declarations Verifying a program with the PLC GFK 0854A
47. d rows are designated as transition rows and even numbered rows are designated as step rows The Logicmaster software automatically applies the element you select to the correct row Transition rows may contain transitions branch connector and vertical link elements Step rows may contain the two types of step elements and vertical link elements A single position in a transition row may contain a transition with a branch element on the top line of the row and another branch element on the bottom line of the row Shape of the Cursor The shape of the cursor in INSERT or EDIT mode changes depending on whether the cursor is on a step or transition row Two cursor shapes are provided on step and transition rows as shown below TI gan Cursor A is used to indicate where a branch element would be inserted Cursor B is used on connector elements branch elements and also on transitions when a branch element already exists below the transition or step At a transition row location you can add a transition or a branch element From cursor A the branch is added at the position indicated by the longer lower segment of the cursor GFK 0854A Chapter 3 Sequential Function Chart Editor 3 15 3 16 The step row cursor is shown below ka di en IC J H onnntie more sal NLM9ONNEUL INE Pre NEN KONN SHES aran INSERT 00005 The longer lower cursor line of cursor A indicates where a branch would be inserted Start of
48. e SFC AND RLD lt lt Press ENTER key to Change Setting gt gt lt lt Press ESC Key to Exit gt gt IRUN OUT EN 2ms SCAN MMONITORML4 ACC WRITE LOGIC LOGIC EQUAL PRG NEWLINEMBLK MAIN 00001 CYCLE 3 Cursor to the line Block Language Choices for New Blocks are and press the Tab key to select a language Your choices are SFC and RLD RLD or SFC Note The multiple language option may be changed as often as desired Your selection takes effect immediately however it only impacts the language selection for new blocks For example ifthe RLD option is selected any old blocks programmed in sequential function chart language will remain SFC when you zoom into them 3 56 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK 0854A Section 6 Debug Functions The following debug functions can help you debug a sequential function chart Forcing optionally overriding transitions disregarding the logic conditions Tracking the evolution history of an SFC block Setting the time base of the network Setting minimum and maximum execution times for a step Monitoring step time faults The SFC_RESET function block allows the network to be reset using RLD Single sweep scan debug You can zoom into steps or transitions from the debug screen The function keys for the debug functions are displayed by pressing the Debug F5 softkey from the top level of the SFC Edit
49. e Then enter a name i e CYCLE on the command line and press Source Connector F2 kell ee Dune sete Wester teste IWA 1 2 PA Sigel Ecol SACU 6ygan 7E imeturk more Iir gt PREPROCESSING LOGIC gt CYCLE ID LMSONNEUL INE Pre Mean BLK MAIN Jane rann REPLACE 90001 CYCLE If you press F2 before entering a name on the command line the Logicmaster software will insert the connector and fill the name location with question marks The question marks indicate that a connector name is required You must enter a name before you can cursor off that connector Note You can use ALT D to delete the connector entry at any time For more information about deleting an element see page 3 35 3 30 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A 19 To add a destination connector for this example above the initial step S1 position the cursor in the top left corner of the network by pressing the Home key Enter the name CYCLE on the command line and press Destination F1 gt l ee Seem GE l elete l na lyz l 4 SAGU OLY Ene turkm more ral PREPROCESSING LOGIC CYCLE D NLMSONNEUL INE Pe RENIN Tn SOs TOE 00001 CYCLE GFK 0854A Chapter 3 Sequential Function Chart Editor 3 31 20 The Element Comment F8 softkey provides access to the comment block that is available with each step element To add a comment press More F9 with the SFC Edi
50. e displayed rather than user definednames Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A Section 2 Inserting Editing an SFC Network Topology The SFC Editor provides both an insert and an edit function The insert function is used to create a new SFC network while the edit function is used to modify an existing SFC network f Ta TABLES STATUS LIB SETUP FOLDER UTILTY PRINT insert EAT e cares tete Boon Bon onp to Bere coon ee VARIABLE DECLARATIONS BLOCK DECLARATIONS INTERRUPTS PREPROCESSING LOGIC POSTPROCESSING LOGIC END OF PROGRAM NLM9ONNEUL INE cal m OM See MN REPLACE Function See Key Function Description Page Fl Insert Create a new SFC network The new network will be placed 3 13 immediately before the cursor In an empty SFC block place the cursor on the POSTPROCESSING LOGIC marker and press the Insert F1 softkey The new network will be placed before the POSTPROCESSING LOGIC marker F2 Edit Modify an existing SFC network Place the cursor on the 3 15 network you want to change and press the Edit F2 softkey F3 Analyze Determine what errors exist in the network and check to 3 44 verify that the block is executable More information on the analyze function is provided at the end of this section F4 Search Search for an element s in an SFC block 3 46 F5 Debug Access debug functions t
51. e is printed inside angle brackets such as lt STEP1 gt The list of rung numbers following a step or transition name includes the rungs in which the reference is used on the indicated instruction within the step or transition Since each step can appear in only one SFC network a step can be quickly located by scanning the listing of each network The block identifier cross reference table includes cross reference information for the step x step f and step t variables and transition names Since step names and transitions are local to the SFC block in which they are used step variables and transition names are not included in the global identifier cross reference table Note References that are found in the preprocessing or post processing logic associated with an SFC block are noted as being ina step lt _PRE gt or lt _POST gt respectively see examplebelow GlobalCross References Global cross references include the block name step or transition name rung number and instruction for each reference address or identifier used in the program Table of Contents Each section of the printout has an entry in the table of contents which is printed at the end of the listing Series 90 Sequential Function Chart Programming Language User s Manual October 1994 Sample SFC Network Page 02 16 94 10 37 GE FANUC SERIES 90 DOCUMENTATION v5 00 Logicmaster SFC Logic Listing lt lt SFC Network 1 gt g
52. e selection screen is not displayed The Logicmaster software would directly display the top level SFC or RLD Editor If the block were an SFC block then the display would be as shown below The cursor will appear in the first row and first column of the first SFC network Note that the last entry in the right corner of the second line of the status information at the bottom of the screen identifies the current cursor location by row number column number and SFC network number For Release 5 the SFC network number will always be 1 wey TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit ana luzikscarchiizebug iconnntfgoptionfiiyoto Enore Mazon es START OF SFC PROGRAM NEWLINE 1 x VARIABLE DECLARATIONS BLOCK DECLARATIONS INTERRUPTS PREPROCESSING LOGIC D NLMIONNEUL INE Changing the Display Mode 3 10 Two display modes allow you to view a sequential function chart These display modes are NORMAL mode the default mode and NUMBER mode Use the ALT N key sequence to toggle these display modes Table 3 1 Display Modes Mode Description Normal In NORMAL mode steps and transitions take three screen lines User defined step and transition names are used rather than numbers You can view edit and monitor SFC programs in NORMAL mode Number NUMBER mode is very similar to NORMAL mode The only difference is that system supplied step and transition names such as S1 52 T1 and T2 ar
53. e the _MAIN block s language you must create a new folder with the desired language for MAIN When the Program F1 softkey is pressed after creating a new folder the Programming Language Selection screen shown below is displayed IHSI TABLES STATUS LIB SETUP FOLDER UTILTY PRINT nn on mo 1O 301 e pen e ca eee SERIES 90 70 PROGRAMMING LANGUAGE SELECTION RELAY LADDER DIAGRAM LD SEQUENTIAL FUNCTION CHART SFC lt lt Select block language or press ESC to exit gt gt I LMSONNEWL INE Pe ELINE To select relay ladder diagram programming language press LD F1 To select sequential function chart language press SFC F2 3 8 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A GFK 0854A After pressing SFC F2 to select sequential function chart language the SFC block is displayed The function keys displayed at the top of the screen are similar to the key selections displayed in the top level of the ladder diagram editor fi e TABLES STATUS LIB SETUP FOLDER UTILTY PRINT insert PEAT e se are zeb conn Bet ton to a gt START OF SFC PROGRAM NEWLINE 1 VARIABLE DECLARATIONS BLOCK DECLARATIONS INTERRUPTS PREPROCESSING LOGIC POSTPROCESSING LOGIC I NLM9ONNEYL INE za BLK _MAIN SIZE 373 PF E INSERT pe Chapter 3 Sequential Function Chart Editor 3 9 If you select an existing block the languag
54. ea REPLACE 00002 14 Press the Up arrow key to move the cursor to the correct location for the simultaneous branch element a te i H ommt more d PREPROCESSING LOGIC BEN zit Tn Jane rann REPLACE 00004 S4 sa 3 28 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A GFK 0854A 15 Press the Simultaneous Branch F7 softkey to enter the first leg of the branch ZEIN HC 2 3 4 5 H Jn sin memore n l PREPROCESSING LOGIC 16 Press Simultaneous Branch F7 again to add a second parallel branch in order to complete the sequence 3 4 5 6 PREPROCESSING LOGIC 32 l D NLMOONNEUL INE oe ELIN BLK MAIN BSIZE 523 ROOS C4iN1 Chapter 3 Sequential Function Chart Editor 3 29 17 To complete this SFC network you may add a source and destination connector The function softkeys for these SFC elements can be displayed by pressing the More F9 softkey Note Connector instructions are only allowed in odd numbered transition rows Source connectors must be added after transitions destination connectors must be added before steps They are entered the same way that branches are entered The location of the connector that will be entered is indicated by the cursor location 18 To enter a source connector first position the cursor on transition T2 by pressing the Left cursor key twice and the Down cursor key onc
55. ed cycles In the forward jump sequence shown below control passes from step S2 to step S4 only if step 52 is active transition T2 evaluates false and transition T3 evaluates true In the backward jump or cycle sequence control passes from step S4 to step S1 only if step S4 is active and transition T5 evaluates true Source and destination connectors cannot occur before a transition Source connectors must occur immediately after the transition Destination connectors must occur immediately before a step Connectors cannot be used adjacent to a branch Refer to appendix A Common User Errors for other restrictions cycle TI jump jump k k Denotes a source connector Denotes a destination connector GFK 0854A Chapter 2 Understanding SFC Language 2 13 Examples of Basic Control Structures The following example shows a sequential function chart segment with a selective sequence After step S3 has been active for one evolution the newly enabled transitions T2 T3 and T4 are evaluated The enabled transition that evaluates true first determines which branch of the selective sequence is selected If more than one transition evaluates true at the same time the leftmost branch with a true transition condition is selected 2 14 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A The following example shows a sequential function chart segment with a simultaneo
56. etion Once deleted thenetworkcannotberestored F7 Renumber Renumberevery step and transition in an SFC block Normally step and transition numbers are assigned in the order in which the steps or transitions are created Automatic names generated for steps and transitions are based on the step and transition numbers Renumbering the steps and transitions will cause numbers to be assigned in an order dependent solely on the SFC topology F9 More Additional editor functions you can select F10 Zoom See description of Zoom F10 above ALT A can be used to abort a function in the SFC Editor Once the abort request is confirmed it will restore the disk version of the current block and all editing done since the last store of the program block will be lost ALT D can be used to delete an SFC network It functions similar to the F6 softkey described above Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A GFK 0854A When Insert F1 or Edit F2 is pressed the following softkey assignments are displayed fe lent CI 2 3 4 5 H Ja Gi more Iir Function See Key Function Mnemonic Description Page F1 Initial Step amp istep Press F1 to enter an initial step in an SFC 2 3 network There can be one and only one initial step in the SFC network F2 RegularStep amp step
57. for each initial step or regular step by positioning the cursor on the time field for a specific step entering a step time limit and pressing the Enter key Time limits must be expressed as fixed point numbers in the range 1 32 767 or the special default value NONE which indicates that there is no minimum or maximum time limit on the step All time values are automatically adjusted to be within the range allowed by the time base For example if the time base is 01 seconds and you enter a maximum step time of 400 seconds the value will be automatically set to the maximum possible value of 327 67 seconds If the time base is 1 second and you enter a minimum time of 1 5 seconds the value will be changed to 2 seconds Note If you change the network time base after you have specified minimum and maximum step times the minimum and maximum step times will be automatically adjusted within the range of the new time base If the PLC is EQUAL to the programmer minimum and maximum step times can be changed ONLINE The new step times are sent to the PLC immediately however changes to the step times are not applied to an active step until that step becomes inactive The changes are stored to disk when you exit from this screen and are stored to the PLC the next time a STOP MODE STORE of the entire program is executed Note In order to have the time base faults appear in the fault table you must enable the Tmr Faults parameter in the CPU
58. g source connector This is just a warning it does not have to be corrected e Source and destination connectors are not allowed within a simultaneous control structure e More than 32 parallel branches within one control structure e Improper nesting of control structures A simultaneous structure is required to be closed that is it must converge and it must be closed in reverse order of its opening e Directed link in SFC diverges into two paths without the use of a divergent control structure In addition to catching the errors that occur at the main level of the sequential function chart when you press the Escape key from the editor all errors at all other levels of the SFC block will also be detected A message about the first error encountered will be displayed in the message box You can choose to correct the error at this time or you may continue to exit the editor Most of the errors listed here will cause the block to be designated non executable This means that the block can be stored but the errors must be corrected before the logic can be stored to the PLC GEK O854A Appendix A Common User Errors A 3 GFK 0854A A Action Action qualifier AIT keys ALT D delete ALT H help screens AIT S store to PLC AIT U force a store 3 45 Altemating control structure See Basic Control Structure B Backward jump Basic control structures 2 10 convergence of a selective sequence convergence of
59. gt 2 lt S2 gt 1 3 5 s3 1 lt S4 gt lt S4 gt lt S4 gt lt S4 gt gt 1 lt S4 gt lt S4 gt Global Cross Reference Tables GFK 0854A GFK 0854A 02 16 94 G00177 G00185 ASSERT ADDSERT RESET CLEAR STOP Program 10 43 GE FANUC SERIES 90 DOCUMENTATION v5 00 Logicmaster SFC Logic Listing BLOCK NICKNAME RST_MSG RACKGEN CNVCTRL RESET CNVCTRL RST_MSG RACKGE RESET CBASE CNVCTR GOTSG ALLSTOP RST_MSG RACKGE CBASE CNVCTR GOTSG ALLSTOP RACKGEN CBASE CNVCTR GOTSG ALLSTOP RST_MSG RACKGE CBASE CNVCTR GOTSG ALLSTOP RST_MSG RACKGEN _MAIN _MAIN RST_MSG RACKGEN RESET CBASE CNVCTRL EXETST CA CA C 70 Chapter 4 Printing SFC Blocks lt S lt S lt S lt S lt S lt S lt S the lt S lt S lt S lt S lt S lt S REF lt S3 gt lt S3 gt lt S3 gt lt S2 gt lt S2 gt lt S2 gt lt S9 gt lt S6 gt lt S5 gt lt S5 gt lt S3 gt lt S2 gt 1 lt S2 gt 1 lt S2 gt 1 SID32 SI 2 SI 2 ZS 258 ZGo P 2 gt lt S2 gt amp Post L lt PPP gt l ar fault tables L lt RSET gt 1 PLC Swa lt S6 gt 2 3 gt 2 gt lt S7 gt gt gt lt S6 gt gt S r5 lt S2 gt DESCRIPTION CROSS REFERENCES lt 4 gt 1 lt S6 gt 1 SI 1 lt S7 gt 1 lt S9 gt 1 lt S5 gt 85 lt S4 gt lt S4 gt lt S6 gt 1 l
60. gt gt I NLM9ONNEUL INE zou ONFIG VALID 3 Cursor to the Tmr Faults field and use the Tab key to toggle the parameter selection to ENABLED The default selection for this parameter is DISABLED l SOU E e os STO gt SERIES 90 70 MODULE IN RACK J SLOT SOFTWARE CONFIGURATION Catalog IC697CPU 771 771 CPU EXPANDABLE MEM IOScan Stop NO Baud Rate Passwords ENABLED Parity Tmr Faults Stop Bits 1 Data Bits 8 Modem TT 0 1 100 Second 7 Count Idle Time 10 Seconds Mode SNP Watchdg Tmr 200 msec The parameters on next page are supported by PLC Rev 4 0 or higher If PLC Firmware version is less than 4 0 do not modify then lt lt More Config Data Exists PgDn for Next Page PgUp for Previous Page gt gt I NLM9ONNEWL INE pati ONFIG VALID REPLACE 3 54 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A The change is automatically stored to disk when you exit from the I O configuration by pressing the Escape key and will be stored to the PLC the next time a store of the program configuration is executed For more information on configuring CPU modules refer to section 2 Configuring CPU Modules in chapter 11 I O Configuration of the Logicmaster 90 70 Programming Software User s Manual GFK 0263 or for 90 30 CPUs refer to chapter 11 CPU Configuration of the Logicmaster 90 30 Programming Software User s Manual
61. hat will help you debug an SFC block 3 57 F6 Comment Associate detailed comments with steps in an SFC network 3 52 F7 Option Access the set up of options that relate to programs containing 3 53 SFCblocks F8 Goto Move the cursor to the location of a specified SFC step 3 61 transition or connector name in the SFC block GFK 0854A Chapter 3 Sequential Function Chart Editor 3 11 3 12 Function Key F9 Function More Description Additional editor functions you can select See Page F10 Zoom Zoom into a variable declaration a block declaration or an interrupt declaration For information on using the zoom function on these marker rungs refer to the Logicmaster 90 Pro gramming Software User s Manual On the PREPROCESSING LOGIC or POST PROCESSING LOGIC marker zoom enables you to zoom into the top level relay ladder diagram editor with preprocessing or postprocessing relay ladder diagramlogic displayed The zoom function can also be used on steps or transitions in an SFC network When you zoom into a step you can view and edit the action logic associated with that step When you zoom into a transition you can view and edit the logic associated with the transition Pressing More F 9 displays these additional editor function keyassignments F6 Delete Cursor to the SFC network to be deleted and press the Delete F6 softkey or ALT D Then confirm the del
62. is performed the first time the SFC network is executed The initial step also becomes active if the SFC is reset via the SFC_RESET function block A regular step is represented by a square which may also contain a name e g DESCEND or RAISE representing the principle function at that step Action logic associated with each step and also with each transition T1 T2 and T3 is programmed in Relay Ladder Diagram logic by zooming into the appropriate step or transition GFK 0854A Chapter 2 Understanding SFC Language 2 5 Series 90 PLC Scan Cycle The Series 90 70 PLC scan continuously executes the _MAIN block and any called SFC block when the PLC is in RUN mode Each SFC block includes Preprocessing Sequential Processing and Postprocessing INPUTS Preprocessing Sequential Processing Postprocessing Preprocessing OUTPUTS Sequential Processing Postprocessing Preprocessing Sequential Processing Postprocessing Figure 2 1 Series 90 70 PLC Scan Cycle Note Logicmaster 90 30 does not allow SFC subroutine blocks therefore only the _MAIN block is allowed to be SFC in the 90 30 version of SFC For that reason in a 90 30 SFC block i e _MAIN block that is SFC rather than RLD the Preprocessing Sequential Processing and Postprocessing is all part of the MAIN block In addition please note that this graphical representation of the PLC scan cycle is not intended to enc
63. ive If the transition was previously ON it will turn OFE Note The effect of toggling a transition may last only one sweep On the next sweep the transition will be evaluated again and the toggled value replaced To keep the transition in its toggled state the transition should first be overridden using the Override F6 softkey from the Debug function keys the F11 function key or the keypad key and then toggled to the desired state Proceed with caution when using this functionality to keep a transition in its toggled state The SFC can be put in an illegal state one that Logicmaster 90 software would normally prevent by enforcing restrictions on the SFC When a transition is overridden its name will flash to indicate its overridden state The toggle and override functions can be used to control the execution path of an SFC network For example to disable one branch of a simultaneous structure while allowing the others to execute normally Toggle the overridden step OFF When the simultaneous structure is entered all paths except the disabled path will execute normally Ina similar series of steps you can disable all simultaneous branches except one or disable all selective branches except one GFK 0854A Chapter 3 Sequential Function Chart Editor 3 59 Evolution History 3 60 The History Shift F7 softkey allows you to view and record an evolution history of the current SFC block The PLC does not have to
64. ive and transition T2 evaluates true 2 a a w H N Divergence of a Selective Sequence Divergence of a Selective Sequence means that there is a choice of two or more paths down which control can be passed but only one will be selected In a divergent selective sequence control passes from step S3 to step S4 only if step S3 is active and transition T2 evaluates true Control passes from step S3 to step S5 only if step S3 is active transition T2 is not true and transition T3 is true left to right priority of transition Exactly one branch of the selective sequence is selected A left to right priority is used to determine the action branch if more than one transition evaluates true at the same time A selective divergence must be preceded by one step The first element after a selective divergence must be a transition 2 10 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Convergence of a Selective Sequence A selective convergent branch can only be preceded by transitions It must be followed by one step In a convergent selective sequence control passes from step 513 to step S15 only if step S13 is active and transition T4 evaluates true Control passes from step S14 to step 515 only if step S14 is active and transition T5 is true Divergence of a Simultaneous Sequence Like the divergence of a selective sequence there is a choice of two or more paths down which control
65. larly one divergent point may have multiple convergent points The following portion of a valid sequential function chart segment illustrates a common point of convergence for two simultaneous sequences Example of a Valid SFC Segment common point of convergence for two simultaneous sequences GFK 0854A Chapter 2 Understanding SFC Language 2 19 2 20 9 The divergence and convergence of sequences must be properly nested For example if a simultaneous sequence diverges after a selective sequence diverges it must converge before the selective sequence converges This valid sequential function chart segment illustrates proper nesting of dissimilar sequences Example of a Valid SFC Segment proper nesting of dissimilar sequences cycle si TI T2 T3 T5 A ye cycle Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A This invalid sequential function chart segment illustrates an improper nesting of two dissimilar sequences Example of an Invalid SFC Segment improper nesting of dissimilar sequences S10 GFK 0854A Chapter 2 Understanding SFC Language 2 21 In the following invalid sequential function chart segment there is a jump out of a simultaneous sequence from step S3 to step S1 Example of an Invalid SFC Segment jump out of sequence cycle TI T2 T3 ED cycle cycle Note When sequences do converge they must do so in a properl
66. logic also called Ladder Logic has been widely used for designing and representing logic control systems since the relay was invented For combinational logic control systems where outputs or actions are directly dependent on the states of inputs or conditions RLD is excellent However for some control problems where control actions are sequential or time dependent Relay Ladder Diagram logic alone can become cumbersome Consider the simplified example of a semi automatic punch a45348 HIGH A lt q HGHA lt q HIGH A q owe q owe nA pi q owe L parmaj In this example a semi automatic punch is initially in the raised position A When the operator presses the Start pushbutton M the punch descends pierces the metal plate at position B and completes the cycle by returning to the raised position In the ladder diagram approach you not only have to take into account the fact that pressing the Start pushbutton M initiates the movement of the punch You must also consider that the operator will release the pushbutton and that he could press the pushbutton before or after the punch is in the rest position This additional information has no bearing on the movement of the punch and complicates the description of the function GFK 0854A 2 1 2 2 Lower Punch What is needed is a method of representing sequential control problems in a sequential manner showing the various actions to be taken in
67. mming Software User s Manual GFK 0263 or for 90 30 users refer to chapter 3 Program Editing in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 Step action logic can also access other ladder diagram blocks or sequential function chart blocks using the relay ladder diagram CALLinstruction For more information on using the CALLinstruction 90 70 users should refer to the Series 90 70 Programmable Controller Reference Manual GFK 0265 or for 90 30 users refer to Series 90 30 Programmable Controller Reference Manual GFK 0467 To exit from the action logic and return to step S1 press the Escape key Chapter 3 Sequential Function Chart Editor 3 7 Selecting the Block s Language In the 90 70 software any program block including the _MAIN block may be programmed in SFC language In Logicmaster 90 30 only the _MAIN block may be programmed in SFC language However the logic for actions and transition conditions in an SFC block must be programmed in relay ladder diagram RLD language When you first enter a new folder _MAIN the Logicmaster software will ask you to select a programming language You may also select a language while creating program blocks in the program block declaration editor Note Once a block s language has been selected it cannot be changed To change the language you must delete the block declaration and create a new block declaration with the desired language To chang
68. more information on naming transitions see page 3 18 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A 6 The location of the bottom leg on the L of the L shaped cursor indicates where a branch instruction would be placed if entered at this location If you move the cursor up at this location the following screen is displayed ZEN 2 3 4 5 Za Ja sil Juoyan10 INTERRUPTS PREPROCESSING LOGIC T1 POSTPROCESSING LOGIC NLM9ONNEUL INE ze DAO SOMES aran REPLACE 90001 S1 pi If you enter a simultaneous branch at this location by pressing the F7 softkey the following screen will be displayed ZEN m 2 3 4 5 H Ja mcommntiemore 1i INTERRUPTS PREPROCESSING LOGIC POSTPROCESSING LOGIC LMSONNEUL INE sal m KON SCOTS INN REPLACE Note that the cursor has automatically advanced to allow you to extend the branch with the next branch keystroke GFK 0854A Chapter 3 Sequential Function Chart Editor 3 23 7 To move the branch below the transition T1 and remove the branch just entered position the cursor on the leftmost portion of the branch Then press the selective link or simultaneous link softkey that corresponds to the branch to be deleted Or you may press ALT D The branch softkeys act as toggle keys either inserting or deleting a branch ZEN 2 3 4 5 H sconmmntimore O INTERRU
69. mplete the appropriate software Print Function screens GFK 0854A 4 1 4 2 The following table describes what is printed on each of the following sample pages beginning on page 4 3 Printed Page SFC Network Description The SFC network is identified with a label in the form SFC network 1 gt gt similar to the RUNG 1 gt gt label used on Relay Ladder Diagramrungs This label is repeated at the top of every page of SFC topology logic printed for the network Preprocessingand PostprocessingLogic Preprocessing and postprocessing Relay Ladder Diagram logicis printed after the network topologies and before the Relay Ladder Diagram logic of the first action Step Logic The step logic listing an expansion of each step into its relay ladder diagram logic follows the preprocessing and postprocessing Relay Ladder Diagram logic Any step comment text associated with the step will be printed before the step s logic TransitionLogic The transition logic section of the printout contains the relay ladder diagram logic for every transition associated with the sequential function chart Transition logic is printed after the logic of all the steps Block Cross References Block cross references are printed immediately after the logic for the block The cross references include the name of the step or transition the rung number and the instruction where each reference is used The step or transition nam
70. mputer Logicmaster software provides foreign keyboard support depending on the configura tion of MS DOS residing on the host computer Consult your MS DOS user s manual for configuration information for your country Installing the Software Help Screens Chapter 2 Operation in both the Logicmaster 90 70 Programming Software User s Manual GFK 0263 and the Logicmaster 90 30 Programming Software User s Manual GFK 0466 describes how to install and start up the Logicmaster programming software Before you can begin using the features and functions described in this manual you must first install the software If you have not yet installed the Logicmaster software follow the installation procedure described in chapter 2 of GFK 0263 or GFK 0466 depending on which version of Logicmaster you are using If the SFC option has already been installed on your computer then once you install Logicmaster SFC is available with no additional installation If the SFC option has not been installed previously then you will need to install the SFC Option diskette after installing Logicmaster Logicmaster software includes detailed Help screens These Help screens are loaded onto the hard disk of your programmer during the software installation procedure and are readily accessible Press ALT H to access the help screens Key Functions AppendixE Key Functions in both the Logicmaster 90 70 Programming Software User s Manual GFK 026
71. n 3 55 Section 6 Debug Functions eeeeeeoeeneoeneooneee 3 57 BEC RESET tit caste teal ciated it ok no ceed a Pot retard ata ks ko Pe ya 3 58 Toggles and Overrides 0 ccc eee 3 59 Evoltition History ie er e A E di ao te Ae ak 3 60 GOtG iya a ata sete ine eh irak pea kari rada e edhe ei eee Sina ti Sao oi ta ni 3 61 Setting the Time Base and Step Time Limits for an SFC Block 3 62 Single Sweep Debug nuciieries Bedri Veta Bowes dere Loe d E e 3 64 Section 7 Program Utility Functions eeeeeeeeeeeccnne 3 65 Loading from the PLC to the Programmer eeeeeeoon 3 65 Storing to the PLC from the Programmer eeeeeeeeeeeoon 3 65 Verifying a Program with the PLC 0 6 6 eee 3 67 Chapter 4 Printing SEC Blocks sci wsve ated bone ea ak pa ries wae 4 1 Sample SFC Network Page 0 6 6 4 3 Sample Preprocessing Postprocessing Logic Page 4 4 Sample Step Logic Page iseci ioi sanio sia e ar e a ee ee 4 5 Sample Transition Logic Page 0 6 6 eee eee 4 6 Sample Page of Block Cross References eeeeeeeeeen 4 7 Sample Page of Global Cross References eeeeeeeeeen 4 8 Sample Table of Contents Page 1 6 6 cece eee 4 10 Appendix A Common User Errors 0 cece cece eee ee eee e ences A 1 Gereral Errors scsi acctie 04 oat neha en we ae ab ate ek ane aki es A 1 Transition Logic Errors 6 eens A 2 Transition Logic Step Action Logi
72. n history of a block B 60 run mode store B 66 selecting the block s lang uage 3 8 setting step time limits setting the time base step comments stop mode store storing changes to an SFC block B 45 storing to the PLC from the program mer B 65 run mode store stop mode store toggles and overrides 3 59 using debug functions usin eal goto cursoring function 3 51 3 61 using the search function 3 46 verifying a program with the PLC Programming SFC actions B 7 R Regular step Reserved names Run mode store 3 66 S Search function enabling the search function 3 47 ending the search Selective control structure See Basic con trol structures Sequential function chart action qualifier 2 3 backward jump basic control structures 2 10 convergence of a selective sequence convergence of a simultaneous se quence Moi of a selective sequence 2 10 Index 3 Index Index 4 divergence of a simultaneous se quence bay examples rules simple sequence 2 10 common user errors cycle 2 13 evolving the sequential function chart Moi of sequential function charts 2 9 general SFC element errors A 2 jump 2 13 print function 4 1 action logic block cross references 4 global cross references 4 8 ee and postprocessing log ic 4 printing an SFC network 4 3 table of contents transition logic SFC top level errors source and destination conne
73. n history with a or respectively A step exceeding its maximum timer is a distinct evolution of the SFC block and is listed as a separate entry in the history log A step that does not attain its minimum time will be logged with the next step s that become active The reason for this is that a step which exceeds its Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A maximum timer is logged at the time the maximum timer has been exceeded The minimum time requirement is not evaluated until the step has become inactive and the next step s have become active For example in the previous screen the third entry records the fact that step 549 exceeded its maximum time at 1 01 a m The second entry was generated at 2 03 a m when the SFC network evolved from steps S50 549 and S48 to step S1 At this point 550 had not attained its minimum time and the second entry was generated to record this fact A fixed amount of user memory in the PLC is required for each SFC block to support this feature The memory is used to store the evolution information Once turned on history is continuously recorded in the PLC until the feature is turned off by pressing Off F2 or a program is stored to the PLC in STOP mode If you exit from an SFC block that has its evolution history recording this will impact the scan time of the PLC unless you turn off the evolution history before exiting from
74. naluzikisearchikdebug Edconnntigoptionfiyoto Kihore o gt CYCLE gt gt CYCLE POSTPROCESSING LOGIC LMSON NEUL INE Pee NEM Tn SOE TSR agra ses 90001 CYCLE GFK 0854A Chapter 3 Sequential Function Chart Editor 3 49 5 Press the Search F4 softkey and then the Enter key again or press ALT Search F4 to search for the next instance of the target CYCLE IN TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit analuziksearchsdebug Baconmnt ppt ionfiigoto hore tizoon gt gt CYCLE POSTPROCESSING LOGIC NLM9ONNEUL INE Pre eM Ine BLK MAIN SIZE 519MROOLIC1iN1 REPLACEBICAPS 90001 CYCLE 6 This time press only the Search F4 softkey Then set up a search for transition T2 by entering T2 inthe Search for field When you press the Enter key the following screen is displayed I TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit analuziksearchisdebug connntggoptionliyoto hore tizoon gt CYCLE gt gt CYCLE POSTPROCESSING LOGIC NLM9ONNEUL INE cos Ton Se JOEL REPLACEBICAPS 00002 TZ zi 3 50 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A 7 Press ALT Search F4 to find the second occurrence of transition T2 IN TABLES STATUS LIB SETUP FOLDER UTILTY PRINT 1053 CE SIZANN 45 MN MN SEE ST Se oz gt START OF TRANSITION 2100001 100005
75. ompass all possible scenarios of PLC scan for 90 70 PLCs e g the _MAIN block could be an SFC block thereby having the same three processing stages within it and the subroutines could be a mixture of RLD and SFC Preprocessing This section is processed at the start of every scan Normally RLD preprocessing logic is used to process at the start of the scan cycle events which may affect the sequential processing section of the program These events may include e Initialization e Operator commands e Resetting the SFC to the initial state Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Sequential Processing This portion of the PLC scan consists of evolving the SFC to its next state and processing the action logic of any steps that become active Only the logic associated with active steps and transitions is scanned by the PLC leading to a significant reduction of scan time For more information see SFC Evolution below Postprocessing This section is processed every scan after the SFC is complete It may contain Relay Ladder Diagram RLD logic to process safety interlocks etc SFC Evolution Astep can be either active or inactive A transition is active only evaluated when the step immediately preceding it is active If a transition evaluates true ON then the immediately preceding step s are made inactive and the immediately succeeding step s are made active
76. on seess eds ra pie eee Reese eee Deed ee a da 1 2 Installing the Software 6 eee 1 2 Help Screens 2 oni ae teeter Roe aad ene hd E 1 2 Key Functions ew ew na wap vent Ale PE ee ae ah A Naha Miele ook ease SS 1 2 Softkey Directory an kann cls ate restate as ene arb motte eee 1 2 Chapter 2 Understanding SFC Language cee cece cece eens 2 1 RUD and SEC a1 ao ala poet kt ieee ak ped ank Wo ale avek ree oak 2 1 LOPS ieir oeeo en e a e eerie hte dec nE EE E NE eee see 2 3 Transitions oa rea ith Ea E EE A E an EE EE A 2 4 Series 90 PLC Scan Cycle vu aa ea tea s tan ea a ek 2 6 SFC EvolutioN o an a tis Se rte arate E Gaile Bee EE TE TE 2 7 Examples of Sequential Function Charts ssas sasssa cece eee 2 9 Basic Control Structures 6 6 6 2 10 Source and Destination Connectors 6 eee 2 13 Examples of Basic Control Structures e eeeeeeeeeeeoon 2 14 Rules for Basic Control Structure 000000 2 16 Chapter 3 Sequential Function Chart Editor e ecesoecescoue 3 1 Section 1 SFC Program Blocks cc cece eee eee eee 3 2 Step METS 6 sess e aaa Poke heared wea bea aba a teu peup d deathbed wie fane 3 3 Step Fatilt Bits sds iben vwe tate e eat ote where alete Bote dala rite 3 3 Step Flag Se nek oi n ke konben ka l d fok ba a seen e te at pi tek be ae 3 3 Format of an SFE BOCK erod ekate at bebe deed be ati aaa kaa moke a 3 4 Preprocessing and Postprocessing Logic
77. ons F6 F6 F6 F6 F6 F6 Program Add Block El t i Commnt Binary Memory Fan F6 Rename F6 Senn Usage Library F7 F7 F7 F7 F7 Create A Reference Edit Ref Option ASCII Table Offset F7 Clear F7 Fr F7 Sizes Templates F8 F8 F8 F8 PLC Lock GOTO ene Sweep F8 F8 Or F8 F8 Table Unlock F9 F9 F9 More Mixed F9 F9 F9 F9 F9 Pause F10 F10 F10 F10 Change Copy ZOOM All F10 F10 F10 to F10 Save Source Fi F2 F3 F4 F5 F6 F7 F8 FI F10 Elemnt More Zoom I 1 pe Commnt F1 F2 F3 F4 F5 F6 F7 F8 FI F10 gt Open Open Erase Delete Delete Analyz M Z Row Col Elemnt Row Col Netwrk ore Som Fi F2 F3 F4 F5 F6 F7 F8 F9 F10 DEBUG Onide HSTRY Goto TIME zoom gale Fi F2 F3 F4 F5 F6 F7 F8 F9 F10 Coilck Ed opt F1 F2 F3 F4 F5 F6 F7 F8 F9 F10 Delete Renumb More Zoom NOTES F unctions shown in ALL CAPS are accessed by holding the Shift key down when pressing the function key Use of capitalization in this manner reflects the convention GFK 0854A Chapter 1 Introduction 1 3 1 4 used on the Logicmaster and SFC screens Librarian functions do not exist for the 90 30 version Refer to chapter 2 of the Logicmaster User s Manuals 90 30 or 90 70 for a similar display of Logicmaster keys and functions Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Chapter Understanding SFC Language 2 RLD and SFC The traditional Relay Ladder Diagram RLD
78. or GFK 0854A e HISTRY TIME to men SO nn Me TOI o el START OF SFC PROGRAM NEWLINE J VARIABLE DECLARATIONS BLOCK DECLARATIONS INTERRUPTS PREPROCESS ING LOGIC CYCLE 4 I CYCLE D SLMSONNEWL INE PR NEULINE REPLACE 60001 Chapter 3 Sequential Function Chart Editor x AN TON SERRE Donn 3 57 SFC_RESET 3 58 You can also control the execution mode through relay ladder diagram logic using the SFC request function SFC_RESET i e the SFC request function is one of the function blocks accessed through the Logicmaster Control softkey spelled CONTRL on the Logicmaster screen To access the SFC_RESET when editing or inserting a step do the following 1 Zoom into the step 2 press the CONTRL softkey Shift F9 and then 3 press the sfcres soft key F6 Note SFC_RESET only has meaning in the action logic under a step If it is used in a subroutine block non SFC the function block will simply pass power without resetting the SFC SFC_RESET The SFC_RESET function can be used to reset the SFC network in the block to the initial step Because SFC blocks are retentive you must use the SFC_RESET function to force an SFC block to start from the initial step on power up or from a STOP TO RUN transition The SFC_RESET function has the following form RESET reset OVR The enable EN and reset inputs are used to control execution of the SFC blo
79. oring changes to an SFC block 3 Search Function Describes how to search for an item within a block 3 46 programmed insequential function chart language 4 Comments Describes how to document actions associated 3 52 witha particular step 5 Options Related Describes fault logging for out of limit step times 3 53 to SFC Blocks and configuration of multiple languages 6 Debug Functions Describes how to force an SFC block to start from 3 57 the initial step force transitions track the evolution ofablock andsetminimum maximum step execu tion times 7 ProgramUtility Describes how to load a program from the PLC to 3 65 Functions theprogrammer store a program to the PLC from theprogrammer and verify a program with the PLC Note In the 90 30 version there are no subroutine SFC blocks That is to say only the _MAIN block is allowed to be SFC GFK 0854A 3 1 Section 1 SFC Program Blocks In order to program a block in sequential function chart language SFC language must be selected at the time the block is created Information on selecting a programming language begins on page 3 8 In the 90 30 software only the _MAIN block can be SFC In Logicmaster 90 70 however the logic of any program block either a MAIN block or a subordinate program block may be programmed in sequential function chart SFC language Parameterized subroutine blocks PSBs are an RLD subroutine block and therefore cannot be programmed using SFC language PSB
80. ost branch path contained within the cursor on the next screen ZEN 2 3 4 5 H i fcommntimore iki gt PREPROCESSING LOGIC I D NLMSONNEUL INE ly BLK MAIN MSIZE S23MROO4 C4iNi 52 Li i 00002 Note If you press the Down cursor key before pressing the Step F2 softkey the step will be entered in the same location as when the step element is added from the previous row 3 26 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A GFK 0854A 11 The Logicmaster software assigns the default name 52 to the second step added to this folder If you cursor left and press the Step F2 softkey two more times the three paths will be assigned steps ZEN 2 3 4 5 H i icommntiemore iki gt PREPROCESSING LOGIC I BLK MAIN SIZE S23MNROO4 CZiNi 54 12 If you try to cursor down and enter a bottom simultaneous branch to close the sequence you will see that the branch is positioned below the transition location ZEI MIL 2 3 4 5 H Ja si more 10 gt PREPROCESSING LOGIC Chapter 3 Sequential Function Chart Editor 3 27 13 Do not press the Simultaneous Branch F7 softkey here You may enter a transition at this position To enter a transition press the F4 softkey felennt MIL 2 3 4 5 H Ja icommntiemore tht PREPROCESSING LOGIC r D NLMSONNEUL INE Pre NL Na i See T
81. r values When Logicmaster 90 software is connected and EQUAL to the PLC the elapsed step times and active steps are displayed on this screen Elapsed step times are shown in terms of the SFC network s time base The final column on the screen indicates whether the maximum step time was exceeded indicated by a sign or the minimum step time was not attained indicated by a sign The name of the active step is displayed in reverse video 3 62 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Setting the Time Base You can use the screen shown on the previous page to set the time base for the SFC network in the sequential function chart block The time base is used for all step timers in the SFC network The value for the time base can be 1 second 1 second default or 01 second To select a value for the time base position the cursor on the Time Base field and press the Tab key repeatedly until the desired time base is displayed Another way to set the time base is to enter the value and press the Enter key Changing the network s time base must be done OFFLINE regardless of whether Logicmaster 90 software is connected to a PLC New time base information is stored to disk when you exit from this screen and stored to the PLC the next time a STOP MODE STORE of the entire program is executed Setting Step Time Limits You can also set minimum and maximum step times
82. re F9 and then Renumber F7 in the SFC Editor Renumbering the steps and transitions will cause numbers to be assigned in an order dependent solely on the SFC topology To create an alternative to the system assigned name enter the desired name on the command line with the cursor positioned on the step or transition and press the Enter key The name must follow the rules for Logicmaster 90 identifiers For more information on identifiers pertaining to the 90 70 version refer to chapter 3 section 5 Variable Declaration Table in the Logicmaster 90 70 Programming Software User s Manual GFK 0263 For more information on identifiers pertaining to the 90 30 version refer to chapter 3 section 5 Variable Declaration Table in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 3 18 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Inserting Editing an Example SFC Network This example takes you step by step through the process of editing an SFC network 1 Enter a new folder and select SFC language The following screen will be displayed I TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit ana luzikscarchiidebug iconnntigoptionIigoto Ehore o gt START OF SFC PROGRAM NEWLINE 1 VARIABLE DECLARATIONS BLOCK DECLARATIONS INTERRUPTS PREPROCESSING LOGIC POSTPROCESSING LOGIC T EONA ou BLK MAIN SIZE 4798 IREPLACE
83. rogram Utilities in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 GFK 0854A Chapter 3 Sequential Function Chart Editor 3 67 Chapter Printing SFC Blocks 4 An SFC network can be printed by selecting to print SFC TOPOLOGY The logic associated with the steps and transitions is printed using the options selected for printing the Relay Ladder Diagram RLD logic A printout of an SFC block begins with the SFC network by listing the steps in the network After the network is printed the preprocessing and postprocessing Relay Ladder Diagram logic is printed followed by the Relay Ladder Diagram logic for each step and finally the Relay Ladder Diagram logic for each transition The variable table is printed after all the logic has been printed For a MAIN SFC block the program block and interrupt block declaration tables follow the variable table Cross reference tables and reference use tables are the last listings printed for the block Each section of the printout has an entry in the table of contents which is printed at the end of the listing Note Chapter 10 Print Functions in the Logicmaster 90 70 Programming Software User s Manual GFK 0263 or Chapter 9 Print Functions in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 contains descriptions of parameters to be set and options to be selected for your printout Refer to the Print Functions chapter to help you co
84. rows by 8 columns Every step transition and connector used within an SFC network must have a name These names are placed in the block s variable declaration table and are known everywhere throughout the block including the relay ladder diagram logic The names cannot however be used outside the current block even if it is the _MAIN block Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GEK O854A Even though they can be referenced throughout the SFC block step and transition names may only be defined once per block That is a given step or transition may only occur once within an SFC network and as stated previously there can be one and only one SFC network within a block Connectors may only occur within one SFC network within a block Within an SFC network there may be one occurrence of a given destination connector but there can be multiple occurrences of the corresponding source connector Step Timers A time value denoted as step t e g S1 t is associated with every step Step t is an integer value which gives the number of units ticks of time relative to the user selected time base that the step has been active It can be used as a read only parameter anywhere in the block on any RLD function operand requiring a single word of input When a step is activated its step timer is reset to zero before starting to accumulate time For information on setting minimum and maximum s
85. s Manual October 1994 GFK 0854A When you press the Zoom F10 softkey the following screen is displayed L TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit Knoditulsearchlg Ki koptionliyoto Kore o gt START OF POSTPROCESSING LOGIC 1 END OF POSTPROCESSING LOGIC 1 I LMSO NEWL INE Pee EUL int TA SOS Dan From this location you can enter the ladder diagram logic that is executed after each evolution of the SFC block The only limit to the amount of logic that can be entered is the logic space available in the block As with preprocessing logic and the logic for steps jumps and MCRs must be resolved within this segment of logic To return to the SFC block press the Escape key Programming SFC Step Action Logic GFK 0854A As first defined on page 2 3 action logic is the logic associated with a step i e the logic programmed by RLD logic language that is executed when the step is active Each step may have action logic consisting of relay ladder diagram rungs associated with it The maximum size of the logic associated with an action is limited by the amount of program memory available To display this ladder logic position the cursor on the step and press the Zoom F10 softkey Step action logic may be edited using the editing features of the Logicmaster software For more information 90 70 users should refer to chapter 3 Program Editing in the Logicmaster 90 70 Progra
86. selective branches and end of simultaneous branches are entered from the step row End of selective branches and start of simultaneous branches are entered from the transition row Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A When a branch element exists below a step step cursor B is displayed as shown in the following screen The branch element would have its own cursor as previously described Fan TABLES STATUS LIB SETUP FOLDER UTILTY PRINT insertizedit analuzikiscarchikdebug iconnntfgoptionfiiyoto hore tizoon gt PREPROCESSING LOGIC Fr NN Oe SE aran 00001 Moving the Cursor The following cursor keys are available in the top level SFC Editor Keys Name Description T and J Up and Down Move one row up or down respectively within the cursor keys sequential function chart Scrolling will occur at the displayboundaries If on the top row of the SFC network the cursor will move onto the preprocessing logic marker rung If on the bottom row of the SFC network the cursor will move onto the postprocessing logic marker rung land gt Left and Right Move one column left or right respectively within the cursor keys sequential function chart Movement beyond the left or right side of the 8 column area will result in a wrap to the next highest or lowest row respectively with the cursor positioned at the opposite side
87. sibility for the accuracy completeness sufficiency or usefulness of the information contained herein No warranties of merchantability or fitness for purpose shall apply The following are trademarks of GE Fanuc Automation North America Inc Alarm Master CIMSTAR Helpmate PROMACRO Series Six CIMPLICITY GEnet Logicmaster Series One Series 90 CIMPLICITY90 ADS Genius Modelmaster Series Three VuMaster CIMPLICITYPowerTRAC GeniusPowerTRAC ProLoop Series Five Workmaster Copyright 1989 1994 GE Fanuc Automation North America Inc All Rights Reserved Preface Logicmaster 90 programming software is used to configure and program the Series 90 programmable controllers This manual describes how to use sequential function chart SFC version of Logicmaster software to program your logic and create an application program for your programmable controller Content of This Manual GFK 0854A For 90 70 users this manual is supplementary in content to the Logicmaster 90 70 Programming Software User s Manual GFK 0263 and to the Series 90 70 Programmable Controller Reference Manual GFK 0265 You will need to refer to these Logicmaster 90 70 manuals in order to become familiar with the features of Logicmaster 90 70 programming software For 90 30 users this manual is supplementary in content to the Logicmaster 90 30 Programming Software User s Manual GFK 0466 and to the Series 90 30 Programmable Controller Reference Manual GFK 0467 You
88. sted and found to now be true Therefore transition T2 becomes inactive step 52 becomes inactive Step S3 becomes active and transition T3 becomes active The action logic associated with step S3 is then executed The following table summarizes this sequence of events for this example Table 2 1 Sequence of Events for the SFC Evolution Scan Step S1 TransitionT1 Step 52 Transition T2 Step S3 Transition T3 1 Active Active Inactive Inactive Inactive Inactive 2 Inactive Inactive Active Active Inactive Inactive 3 Inactive Inactive Active Active Inactive Inactive 4 Inactive Inactive Inactive Inactive Active Active Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Examples of Sequential Function Charts The following example shows part of a correctly structured sequential function chart It has an initial step S1 two regular steps S2 and S3 and two transitions T1 and T2 The next example shows part of a sequential function chart that is incorrectly structured It has two steps S2 and S3 that do not have a transition between them GFK 0854A Chapter 2 Understanding SFC Language 2 9 Basic Control Structures The following examples illustrate the six basic control structures that can be used in a sequential function chart Simple Sequence In a simple sequence control passes from step 52 to step 53 only if step 52 is act
89. t SIMPL SIMUL JPCY SELEC PPP CMPD2 OPEN propre gt LOOP1 Program EXETST C 70FOLDER EXETST GFK 0854A Chapter 4 Printing SFC Blocks 4 3 Sample Preprocessing Postprocessing Logic Page 02 16 94 10 40 GE FANUC SERIES 90 DOCUMENTATION v5 00 Logicmaster SFC Logic Listing KKK KKK KKK EXPANSION OF PREPROCESSING LOGIC KKK KKK KKK KKK START OF PREPROCESSING LOGIC lt lt RUNG 1 gt gt TOTAL I1 Q TOTAL l l CONST I2 00001 END OF PREPROCESSING LOGIC kkkkkkkkkkkkkik EXPANSION OF POSTPROCESSING LOGIC kkk kk k kx START OF POSTPROCESSING LOGIC lt lt RUNG 1 gt gt TOTAL I1 Q TOTAL2 l l CONST I2 00001 END OF POSTPROCESSING LOGIC KKKKKKKKKKKKKKK EXPANSION OF STEP si KKKKKKKKKKKKKKK START OF ACTION FOR STEP SI lt lt RUNG 1 gt gt NO ERR CALL FAULT INIT_ INT EXTERNAL ASCIT Q G00001 CONST IN O 600185 CONST X1 LEN 00000 LEN 0001 100022 100001 CONST X2 Program EXETST C 70FOLDER EXETST Block RESET 4 4 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Sample Step Logic Page 02 16 94 10 37 GE FANUC SERIES 90 DOCUMENTATION v5 00 Logicmaster SFC Logic Listing KKK KKK KKK EXPANSION OF STEP REDME 4 4X RK KAR KAR KKK START OF ACTION FOR STEP
90. t S7 gt 1 lt S8 gt 1 1 1 1 1 rocessing 3 6 9 lt S3 gt 2 lt S8 gt 2 lt S4 gt 2 lt S11 gt 2 lt S7 gt 2 lt 812 gt 2 lt S5 gt 2 lt S59 gt 2 lt S2 gt lt S8 gt lt S2 gt lt S2 gt lt S7 gt lt S2 gt FOLDER EXETST 3 6 SEZI 2 8845 2 S86 gt 2 lt 56 gt 2 2 89 gt 2 lt S10 gt 2 2 lt S3 gt 3 2 4 6 lt S3 gt 2 lt 84 gt 2 85 2 3 A 83 gt 2 lt S4 gt 2 lt S5 gt 3 Global Cross Reference Tables 4 9 Sample Table of Contents Page 02 16 94 Program 10 43 GE FANUC SERIES 90 DOCUMENTATION EO G TG TABLE _MAIN SFC Network 1 Topology Step Logic EDME ET PL KG Fi EC D1 D2 4 AZOCAQTHOUNNDAD AUR KR UMDHH OHNE OXAUVVUVHAERE HOLD Transition Logic Program Block Declaration Table Cross Reference Tables RST_MSG SFC Network 1 Topology Step Logic Transition Logic Cross Reference Tables Non printable Blocks Lists Global Cross Reference Tables SL Xref and Use Tables EXETST C 70FOLDER EXETST v5 00 CONTENTS m AWDDDUUO SP BWWWNHND RR m a Contents TABLE OF CONTENTS Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GEK O854A Appendix Common User Errors A In general anything that would be an error in a relay ladder diagram logic block will also be an error in the relay ladder diagram portion of a sequential function chart logic block In addition there are se
91. tep times refer to Debug Functions on page 3 57 Step Fault Bits Although you are not required to have a minimum or maximum activation time if you do the following should be noted When a step does not attain its minimum activation time or when it exceeds its maximum activation time a fault bit denoted as step f e g S1 f is set For example the fault bit for step 51 is S1 f This fault bit may be referenced in RLD logic anywhere in the block but cannot be changed because it is read only It can be used on any contact instruction but not with transitional contacts The fault bit retains its fault status until the step becomes active again at which time it is set false Step Flags Aboolean step flag denoted as step x e g s1 x is also associated with every step The step flag indicates the execution status of all action logic within the step It may be referenced in the relay ladder diagram RLD logic anywhere in the block to determine if a given step is active or inactive The step flag can be used on any non transitional contact However the step flag may not be written to in user logic because it is read only Note Step t step f and step x values are cleared when the current folder is stored and when an SFC_RESET function is executed GFK 0854A Chapter 3 Sequential Function Chart Editor 3 3 Format of an SFC Block 3 4 The general format of a _MAIN block programmed in sequential function chart language
92. the SFC block Goto The goto function enables you to quickly go to a specific step transition or connector in an SFC network To use this function you must first be positioned within the SFC network Enter the name of the specific step transition or connector on the command line and press the Goto F8 softkey from the Debug function keys If Goto F8 is pressed without entering a name on the command line and the programmer is ONLINE and EQUAL to the PLC the cursor will advance to the next active step in the SFC network GFK 0854A Chapter 3 Sequential Function Chart Editor 3 61 Setting the Time Base and Step Time Limits for an SFC Block To use this feature for a block press the Time Shi ft F9 softkey from the Debug function keys The following screen is displayed DEBUG HISTRY n on e on on con on OR OO gt TIME BASE FOR SFC NETWORK 1 IN BLOCK _MAIN SECONDS MINIMUM TIME MAXIMUM TIME ELAPSED TIME FAULT NONE NONE 3 00 4 00 NONE NONE NONE NONE lt lt Use the TAB key to cycle through time base values gt gt lt lt Press ALT A or ESC to exit gt gt UN OUT EN 2ms SCAN L4 ACC WRITE LOGIC LOGIC EQUAL PRG NEWLINEMBLK _MAIN The Time Base field for the first SFC network in the block is displayed followed by a list of the initial and regular steps in the network You can use the cursor keys to scroll through this screen Then cursor to individual Step Time Limit fields to set thei
93. tkey The following screen will be displayed Zweig TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit Khoditulscarchig Ki keptionkiyoto nore Moon A ns nxRn OO START OF TRANSITION END OF TRANSITION I D LMSO NEWL INE pats TRN T1 SIZE 6O5 RUNG 0001 REPLACE Chapter 3 Sequential Function Chart Editor 3 33 Then press Insert F1 to enter new logic or Edit F2 to edit existing logic for that transition Note that the RLD softkeys will be displayed after you press Insert F1 or Edit F2 Press F5 to display the following rung S IMRCTR MATH RELATN BITOP DATAMY TABLES CONURT CONTRL OPN SP MONA 2E5Ve 1001 BC Be SM ME SIY ehorz fUhore e ae START OF TRANSITION 1 END OF TRANSITION I D NLMSONNEUL INE pan TRN T1 JAME A REPLACE si Entering action logic for a step is similar to entering action logic for a transition Position the cursor on the step and press the Zoom F10 softkey Then press Insert F1 or Edit F2 to enter new relay ladder diagram RLD logic or edit existing RLD logic 3 34 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Deleting an Element The Erase Element function press More F9 to display this key or ALT D can be used to remove any SFC element such as a step or transition When a step or transition is erased its logic is also deleted When the Erase Element F5
94. to document actions associated with a particular step These step comments can be viewed while editing the program or printed on the program listing To invoke the comment text editor position the cursor on the step and press the Comment F6 softkey The comment text editor functions the same as it does for the ladder diagram COMMENT instruction in Logicmaster 90 programming software For more information on the Logicmaster COMMENT instruction refer to chapter 3 Program Editing in the Logicmaster 90 70 Programming Software User s Manual GFK 0263 or in the Logicmaster 90 30 Programming Software User s Manual GFK 0466 When a step element has a comment associated with it an asterisk is displayed in the upper left corner of the step graphic as shown for steps 53 and S4 in the following example screen N TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit analuziksearchfsdebug connntgoptionlsyoto hore tizoon gt PREPROCESSING LOGIC CYCLE gt gt CYCLE l NLM9ONNEUL INE at JANN JAZ JONN REPLACE a Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A Section 5 Options Related to SFC Blocks The following options are available for all SFC language blocks in a program e Fault logging for out of limit step times e Program block language selection options Fault Logging for Out of Limit Step Times If a minimum and or maximum
95. tor function softkeys displayed at the top of the screen Then press F8 For more information on comments refer to section 5 Comments on page 3 52 For additional information on the Logicmaster COMMENT instruction refer to chapter 3 Program Editing inthe Logicmaster 90 70 Programming Software User s Manual GFK 0263 or in chapter 3 of the Logicmaster 90 30 Programming Software User s Manual GFK 0466 IN TABLES STATUS LIB SETUP FOLDER UTILTY PRINT linsertfzedit Manaluzikscarchfsdebug connntgoptionliyoto hore tizoon gt PREPROCESSING LOGIC CYCLE gt gt CYCLE D LMSONNEUWL INE cote BLK MAIN ESIZE S60MROOSIC1iN1 REPLACE a When a step element has a comment associated with it an asterisk is displayed in the upper left corner of the step graphic as shown for steps 53 and S4 in the screen shown above 3 32 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A GFK 0854A 21 To enter action logic for a transition cursor to that transition and press the Zoom F10 softkey The action logic for a transition must contain logic that at a minimum sets its transition variable For example the action logic for transition T1 must contain a rung similar to the ones shown below to set transition T1 For 90 70 Or for 90 30 To add this rung of transition logic position the cursor on transition T1 and press the Zoom F10 sof
96. tore all of the data you must change the selections for reference tables and configuration to Y Yes To store only part of the data select N No for the data you do not want to store The Tab key may also be used to toggle the selection of each option After the selections are made press the Enter key to begin the store process Run Mode Store In a RUN MODE STORE only changed blocks are stored to the PLC A RUN MODE STORE can only be performed if the SFC blocks to be stored have the same network topology as what is currently stored in the PLC Only the RLD logic for the existing steps and transitions can be changed Note SFC blocks cannot replace RLD blocks and vice versa during a RUN MODE STORE 3 66 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Verifying a Program with the PLC If the program in the current folder is equal to the program in the PLC a message displayed on the screen will state that the verify is complete and no miscompares were found the program logic equality state will be set to EQUAL If the program in the current folder is not equal to the program in the PLC the verify function will list which blocks are different For more information on verifying a program with the PLC with the 90 70 software refer to chapter 9 Program Utilities in the Logicmaster 90 70 Programming Software User s Manual GFK 0263 For 90 30 users refer to chapter 8 P
97. urce amp srecnct Press F2 to enter asource connector You 2 13 Connector must enter a name for the source connector before the cursor can be moved F3 Open Row Press F3 to add two rows immediately 3 36 above the cursor location F4 Open Column Press F4 to add a column at the cursor 3 38 position F5 EraseElement Press F 5 or ALT D to remove branch 3 35 elements or erase a step transition or connector element F6 Delete Row Press F6 to delete the current row at the 3 40 cursor location and the next row F7 Delete Column Delete F 7 to delete the column at the 3 42 cursorposition F8 Analyze Press F8 to check the topology display 3 44 Network amessage about the first error encountered and position the cursor on that error F9 More Press F 9 to return to the first level of SFC elements F10 Zoom Press F10 to zoom into a step or transi tion When you zoom into a step you can view the action logic associated with that step When you zoom into a transi tion you can view the logic associated with that transition 3 14 Series 90 Sequential Function Chart Programming LanguageUser s Manual October 1994 GFK 0854A Grid Organization Each SFC network may contain up to 128 element rows and 8 element columns When the status area is displayed on the screen only 6 rows by 8 columns of the network can be displayed without the status area an additional row can be displayed The status line may be toggled off by pressing ALT E Odd numbere
98. us sequence Example of a Valid SFC Segment with Simultaneous Sequence After step S3 has been active for one evolution the newly enabled transition T2 is evaluated When transition T2 evaluates true step 53 becomes inactive and steps S4 55 56 and 57 all become active All simultaneous branches are executed in parallel Transition T2 is disabled and transitions T3 and T4 are enabled When steps 58 55 S9 and S7 are all active and transition T5 evaluates true all simultaneous branches are terminated and step S10 becomes active GFK 0854A Chapter 2 Understanding SFC Language 2 15 Rules for Basic Control Structure 2 16 When constructing a sequential function chart the following rules should be followed 1 Only one initial step may occur in the SFC graph The initial step may not occur within a simultaneous structure 2 Any two steps in sequence must be separated by a transition In the following invalid sequential function chart segment a backwards jump or cycle directly connects two steps without an intervening transition Example of an Invalid SFC Segment cycle A gt TI T2 km cycle 3 Any two transitions in sequence must be separated by a step 4 Each transition must contain one and only one rung of logic which at a minimum sets its transition variable For example transition T1 must contain a rung similar to the rung shown below in order to set the transition variable T1 For 90 70
99. users depending on the type of changes made to the block and whether the block is still executable you may be able to store an SFC block to a PLC while the PLC is in STOP or RUN mode This option is not available for 90 30 users The type of changes allowed are changes to the relay ladder diagram logic associated with steps transitions or the preprocessing or postprocessing logic In addition the block cannot contain any errors While online changes are being made the status line will change from LOGIC EQUAL to BLOCK EDIT After the store is completed the status line will change back to LOGIC EQUAL However if you make any changes to the SFC network topology or if any errors exist the block cannot be stored to a running PLC from the editor Changes to the network will result in the status line changing to LOGIC NOT EQ For 90 70 users attempts to RUN MODE STORE a block that has had a change to its topology will result in an error from the PLC This is nonapplicable to 90 30 users because the RUN MODE STORE option is not available GFK 0854A Chapter 3 Sequential Function Chart Editor 3 45 Section 3 Search Function 3 46 The Search function is used to search for an item within a block programmed in sequential function chart language The Search softkey functions the same as it does for a ladder diagram block For more information on the Search function refer to section 11 Search Function in chapter 3 Program Editing
100. veral global checks made over an entire relay ladder diagram logic block including missing labels backward MCR jumps missing END_FORs and too many program block calls These types of global checks are also applied individually to each relay ladder diagram section of an SFC block For example every action logic section must have a matching label for each unique jump within that section of relay ladder diagram logic The only exception is the check on the number of program block calls For a sequential function chart block the check is made over the entire SFC block not the individual relay ladder diagram logic sections This appendix describes error conditions that are unique to sequential function chart logic blocks and to the ladder diagram logic found within them It does not include ladder diagram errors that are common to ladder diagram logic in both ladder diagram blocks and SFC blocks General Errors The following errors will be detected while entering a relay ladder diagram rung e Reference to a transition variable name outside the relay ladder diagram transition logic for the variable e Attempting to write to a step x or step f flag e Attempting to write to a step t value GFK 0854A A 1 Transition Logic Errors The following error conditions will be detected when you press the Escape key to exit from a transition logic section The block will remain unexecutable until these errors are corrected e Transition variable
101. will need to refer to these Logicmaster 90 30 manuals in order to become familiar with the features of Logicmaster 90 30 programming software The Series 90 Sequential Function Chart Programming Language User s Manual GFK 0854A contains only that information which is unique to the sequential function chart version of Logicmaster 90 software It does not repeat material found in either the User s Manuals or the Reference Manuals that is common to both the SFC and RLD versions of Logicmaster 90 software This is the second edition of the Series 90 Sequential Function Chart Programming Language User s Manual GFK O854A It contains the following chapters and appendixes Chapter 1 Introduction provides an introduction to sequential function chart language and describes what you will need in order to create an application program Chapter 2 Understanding SFC Language provides an overview of sequential function chart SFC language Chapter 3 Sequential Function Chart Editor describes SFC program blocks how to insert edit an SFC network and the functions available in the SFC Editor Chapter 4 Printing SFC Blocks describes a typical printout of an SFC network and provides examples of each section of the printout Appendix A Common User Errors lists common user errors iti Preface Revisions to This Manual Changes made to this manual reflect the features of this release of SFC October 1994 primarily the inclusion of a
102. y nested manner Selective structures can remain open but simultaneous structures must be closed 2 22 Series 90 Sequential Function Chart Programming Language User s Manual October 1994 GFK 0854A The following sequential function chart segment is invalid because when step S2 is active and transition T2 evaluates true both steps 52 and 53 become active simultaneously within a sequential sequence cycle2 S cyclel 2 oy cyclel S w Ke lan H H N lan cycle2 The example shown below incorporates a divergent selective sequence to make the SFC chart sequence valid cycle2 S cyclel S T2 lari T4 1 T1 2 T3 cyclel cycle2 GFK 0854A Chapter 2 Understanding SFC Language 2 23 Chapter 3 Sequential Function Chart Editor The Sequential Function Chart Editor is used to create modify or monitor a program block written in sequential function chart SFC language This chapter contains the following sections Section Title Description Page 1 SFC ProgramBlocks Describes the structure of an SFC block how to 3 2 See Note below for select the block s language cursor movement within 90 30 considerations the block and the functions available in the SFC Editor 2 Inserting Editing Describes how to create a new SFC network or 3 11 an SFC Network modify an existing network Also included is information on displaying errors in the network and st

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