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RETURNING VALUES CRIMSON USER MANUAL - MODULAR CONTROLLER RETURNING VALUES As mentioned above, programs can return values. Such programs can be invoked by other programs or by expressions anywhere in the database. For example, if you want to perform a particularly complex decode on a number of conditions relating to a motor and return a value to indicate the current state, you could create a program that returns an integer like this… if( MotorRunning ) return 1; else { if( MotorTooHot ) return 2; if( MotorTooCold ) return 3; return 0; } You could then configure a multi-state formula to invoke this program, and use that tag’s format tab to define the names of the various states. The invocation would be performed by setting the tag’s Value property to Name(), where Name is the name of the program in question. The parentheses are used to indicate a function call, and cannot be omitted. HERE BE DRAGONS! Note that you have to exercise a degree of caution when using programs to return values. In particular, you should avoid looping for long periods of time, or performing actions that make no sense in the context in which the function will be invoked. For example, if the code fragment above called the GotoPage function to change the page, the display would change every time the program was invoked. Imagine what would happen if you, say, tried to log data from the associated tag, and you’ll realize that this would not be a good thing! Therefore, keep programs that return values simple, and always consider the context in which they will be run. If in doubt, avoid doing anything other than simple math and if statements. PASSING ARGUMENTS As also mentioned above, program can accept arguments. As an example, suppose you want to write a program called FindMean to take the average of two values. The program could be configured to accept two integer arguments, a and b, as shown in the example given when defining the purpose of the Arguments property. The program would also be configured so as to return a integer value. The code within the program would then be defined as… return (a+b)/2; Once this program has been created and translated, you will be able to enter an expression such as FindMean(Tag1, Tag2) to invoke it with the appropriate arguments. In this case, the expression will be equal to the average of Tag1 and Tag2. PAGE 228 http://www.redlion.net/controller
CONFIGURING PROGRAMS PROGRAMMING TIPS PROGRAMMING TIPS The sections below provide an overview of the programming constructions supported by Crimson. The basic syntax used is that of the C programming language. Note that the aim is not to try and teach you to become a programmer, or to master the subtleties of the C language. Such topics are beyond the scope of this manual. Rather, the aim is to provide a quick overview of the facilities available, so that the interested user might experiment further. MULTIPLE ACTIONS The simplest type of program comprises a list of actions, with each action taking up a single line, and being followed by a semicolon. All of the various actions defined in the Writing Actions section are available for use. Simple programs like this are typically used where combining the actions in a single action definition would otherwise prove unreadable. REVISION 6 PAGE 229
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LP0631 CRIMSON 2 USER MANUAL MODULA
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GETTING STARTED TABLE OF CONTENTS T
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GETTING STARTED TABLE OF CONTENTS A
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GETTING STARTED TABLE OF CONTENTS A
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GETTING STARTED TABLE OF CONTENTS T
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GETTING STARTED TABLE OF CONTENTS I
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GETTING STARTED TABLE OF CONTENTS F
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GETTING STARTED TABLE OF CONTENTS S
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GETTING STARTED SYSTEM REQUIREMENTS
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QUICK START OVERVIEW QUICK START Th
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QUICK START MAPPING DATA To create
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QUICK START DOWNLOADING In the exam
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CRIMSON BASICS MAIN SCREEN ICONS CR
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CRIMSON BASICS SELECTING THE MODULA
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CRIMSON BASICS DOWNLOADING TO THE M
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CRIMSON BASICS DOWNLOADING TO THE M
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MODULE CONFIGURATION WORKING WITH M
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MODULE CONFIGURATION CSPID - PID MO
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MODULE CONFIGURATION CSSG - STRAIN
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MODULE CONFIGURATION CSTC/CSRTD - T
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MODULE CONFIGURATION CSINI/CSINV -
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MODULE CONFIGURATION CSINI/CSINV -
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MODULE CONFIGURATION CSOUT - ANALOG
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MODULE CONFIGURATION CSOUT - ANALOG
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MODULE CONFIGURATION CSDIO - DIGITA
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MODULE CONFIGURATION CSDIO - DIGITA
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PROTOCOL OPTIONS CRIMSON USER MANUA
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ETHERNET CONFIGURATION CRIMSON USER
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MAPPING DATA CRIMSON USER MANUAL -
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DATA TRANSFORMATION CRIMSON USER MA
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ADVANCED COMMUNICATIONS USING EXPAN
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ADVANCED COMMUNICATIONS SHARING SER
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ADVANCED COMMUNICATIONS USING ELECT
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ADVANCED COMMUNICATIONS USING ELECT
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ADVANCED COMMUNICATIONS WORKING WIT
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OPC COMMUNICATION OPC COMMUNICATION
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USING TIME MANAGEMENT When creating
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USING TIME MANAGEMENT selected, the
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CONFIGURING THE SYNCHRONIZATION MAN
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CONFIGURING THE FTP SERVER Numerous
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CONFIGURING DATA TAGS ALL ABOUT TAG
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CONFIGURING DATA TAGS CREATING TAGS
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CONFIGURING DATA TAGS EDITING PROPE
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CONFIGURING DATA TAGS EDITING FLAG
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CONFIGURING DATA TAGS EDITING INTEG
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CONFIGURING DATA TAGS EDITING MULTI
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CONFIGURING DATA TAGS EDITING STRIN
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CONFIGURING DATA TAGS MORE THAN TWO
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CONFIGURING DATA TAGS NOTES FOR EDI
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USING THE PAGE LIST CRIMSON USER MA
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SELECTING PRIMITIVES CRIMSON USER M
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EDITING PRIMITIVES CRIMSON USER MAN
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PRIMITIVE DESCRIPTIONS CRIMSON USER
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DEFINING SYSTEM ACTIONS CRIMSON USE
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ACTION DESCRIPTIONS CRIMSON USER MA
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ADVANCED TOPICS CRIMSON USER MANUAL
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USING THE PAGE LIST CRIMSON USER MA
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ADDING DISPLAY PRIMITIVES CRIMSON U
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SELECTING PRIMITIVES CRIMSON USER M
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GROUPING PRIMITIVES CRIMSON USER MA
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DEFINING ACTIONS CRIMSON USER MANUA
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Page 196 and 197: PRIMITIVE DESCRIPTIONS CRIMSON USER
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Page 240 and 241: CHANGING THE LANGUAGE CRIMSON USER
Page 242 and 243: DATA AVAILABILITY CRIMSON USER MANU
Page 244 and 245: PROGRAM PROPERTIES CRIMSON USER MAN
Page 248 and 249: PROGRAMMING TIPS CRIMSON USER MANUA
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Page 252 and 253: NOTES FOR EDICT USERS CRIMSON USER
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Page 259 and 260: CONFIGURING DATA LOGGING THE LOGGIN
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Page 266 and 267: COMPACTFLASH ACCESS CRIMSON USER MA
Page 268 and 269: WEB SERVER SAMPLES CRIMSON USER MAN
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Page 273 and 274: USING THE SECURITY SYSTEM SECURITY
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Page 288 and 289: RUNNING PROGRAMS CRIMSON USER MANUA
Page 290 and 291: USING RAW PORTS CRIMSON USER MANUAL
Page 293 and 294: SYSTEM VARIABLE REFERENCE HOW ARE S
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SYSTEM VARIABLE REFERENCE DISPCONTR
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SYSTEM VARIABLE REFERENCE DISPUPDAT
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SYSTEM VARIABLE REFERENCE PI PI DES
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SYSTEM VARIABLE REFERENCE TIMEZONEM
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PROGRAMMING REFERENCE EXPRESSION OP
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PROGRAMMING REFERENCE PROGRAMMING S
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FUNCTION REFERENCE NOTES FOR EDICT
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FUNCTION REFERENCE ACOS(VALUE) ACOS
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FUNCTION REFERENCE ASIN(VALUE) ASIN
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FUNCTION REFERENCE ATAN2(A, B) ATAN
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FUNCTION REFERENCE CLEAREVENTS() CL
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FUNCTION REFERENCE COMMITANDRESET()
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FUNCTION REFERENCE COMPACTFLASHSTAT
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FUNCTION REFERENCE COPY(DEST, SRC,
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FUNCTION REFERENCE CREATEDIRECTORY(
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FUNCTION REFERENCE DATATOTEXT(DATA,
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FUNCTION REFERENCE DECTOTEXT(DATA,
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FUNCTION REFERENCE DELETEDIRECTORY(
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FUNCTION REFERENCE DEVCTRL(DEVICE,
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FUNCTION REFERENCE DISPOFF() DISPOF
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FUNCTION REFERENCE DRVCTRL(PORT, FU
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FUNCTION REFERENCE ENABLEDEVICE(DEV
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FUNCTION REFERENCE EXP(VALUE) EXP(V
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FUNCTION REFERENCE FILL(ELEMENT, DA
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FUNCTION REFERENCE FINDFILEFIRST(DI
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FUNCTION REFERENCE FINDTAGINDEX(LAB
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FUNCTION REFERENCE FTPGETFILE(SERVE
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FUNCTION REFERENCE GETALARMTAG(INDE
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FUNCTION REFERENCE GETCAMERADATA(PO
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FUNCTION REFERENCE GETDISKFREEBYTES
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FUNCTION REFERENCE GETDISKSIZEBYTES
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FUNCTION REFERENCE GETINTERFACESTAT
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FUNCTION REFERENCE GETMONTHDAYS(Y,
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FUNCTION REFERENCE GETNETID(PORT) G
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FUNCTION REFERENCE GETNETMASK(PORT)
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FUNCTION REFERENCE GETNOWDATE() GET
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FUNCTION REFERENCE GETPORTCONFIG(PO
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FUNCTION REFERENCE GETSTRINGTAG(IND
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FUNCTION REFERENCE GETUPDOWNDATA(DA
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FUNCTION REFERENCE GOTOPAGE(NAME) G
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FUNCTION REFERENCE HASACCESS (RIGHT
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FUNCTION REFERENCE INTTOTEXT(DATA,
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FUNCTION REFERENCE ISWRITEQUEUEEMPT
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FUNCTION REFERENCE LEN(STRING) LEN(
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FUNCTION REFERENCE LOG(VALUE) LOG(V
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FUNCTION REFERENCE LOGSAVE() LOGSAV
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FUNCTION REFERENCE MAKEINT(VALUE) M
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FUNCTION REFERENCE MEAN(ELEMENT, CO
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FUNCTION REFERENCE MIN(A, B) MIN(A,
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FUNCTION REFERENCE MUTESIREN() MUTE
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FUNCTION REFERENCE NOP() NOP() ARGU
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FUNCTION REFERENCE PI() PI() ARGUME
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FUNCTION REFERENCE POPDEV(ELEMENT,
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FUNCTION REFERENCE PORTGETCTS(PORT)
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FUNCTION REFERENCE PORTPRINT(PORT,
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FUNCTION REFERENCE PORTSETRTS(PORT,
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FUNCTION REFERENCE POSTKEY(CODE, TR
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FUNCTION REFERENCE RAD2DEG(THETA) R
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FUNCTION REFERENCE READDATA(DATA, C
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FUNCTION REFERENCE READFILELINE(FIL
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FUNCTION REFERENCE RIGHT(STRING, CO
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FUNCTION REFERENCE SCALE(DATA, R1,
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FUNCTION REFERENCE SENDMAIL(RCPT, S
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FUNCTION REFERENCE SETINTTAG(INDEX,
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FUNCTION REFERENCE SETNETCONFIG(POR
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FUNCTION REFERENCE SETPORTCONFIG(PO
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FUNCTION REFERENCE SETREALTAG(INDEX
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FUNCTION REFERENCE SHOWMENU(NAME) S
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FUNCTION REFERENCE SIN(THETA) SIN(T
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FUNCTION REFERENCE SLEEP(PERIOD) SL
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FUNCTION REFERENCE STDDEV(ELEMENT,
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FUNCTION REFERENCE STRIP(TEXT, TARG
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FUNCTION REFERENCE TAN(THETA) TAN(T
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FUNCTION REFERENCE TEXTTOADDR(ADDR)
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FUNCTION REFERENCE TEXTTOINT(STRING
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FUNCTION REFERENCE USECAMERASETUP(P
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FUNCTION REFERENCE USERLOGON() USER
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FUNCTION REFERENCE WRITEFILE(FILE,
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TROUBLESHOOTING GENERAL TROUBLESHOO
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TROUBLESHOOTING SERIAL COMMUNICATIO
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TROUBLESHOOTING PROGRAMS PROGRAMS P
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