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FC105 (Scale) on SCL

Created by: thequark at: 12/29/2010 6:37 PM (5 Replies)

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12/29/2010 6:37 PM	Rate (0)
thequark Posts: 15 Rating: (0)	Excuse for my any answers but I´m newbie in SCL. In this test code, compilation launch an error like "function type not valid or not exist." SCALE(IN := 1 // IN: INT ,HI_LIM := DB100.Hi // IN: REAL ,LO_LIM := DB100.low // IN: REAL ,BIPOLAR := False // IN: BOOL ,OUT := DB100.out // OUT: REAL ); // WORD Hi, low and out has been declared in DB100 as Real. The structure is generated from the SCL "Call FC structure" in the menu. Which is the problem? Thanks.
thequark Posts: 15 Rating: (0)
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12/29/2010 8:00 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/25/2025 Posts: 6885 Rating: (1368)	Dear member thequark In this test code, compilation launch an error like "function type not valid or not exist." SCALE(IN := 1 // IN: INT ,HI_LIM := DB100.Hi // IN: REAL ,LO_LIM := DB100.low // IN: REAL ,BIPOLAR := False // IN: BOOL ,OUT := DB100.out // OUT: REAL ); // WORD Hi, low and out has been declared in DB100 as Real. The structure is generated from the SCL "Call FC structure" in the menu. Which is the problem? Thanks. The Magic solution would be declaring addresses of DB100.Hi and DB100.low as real numbers in symbol table.As a user of SCL optional package , I always complete symbol before starting programming. Best regards
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12/30/2010 4:22 PM	Rate (0)
thequark Posts: 15 Rating: (0)	I don't know how declare DB directions on Symbol Table. Anyhow I have tried with direct values on function and error persists: FUNCTION_BLOCK FB7 VAR_TEMP END_VAR VAR END_VAR SCALE(IN := 1 // IN: INT ,HI_LIM := 5.0 // IN: REAL ,LO_LIM := 0.0 // IN: REAL ,BIPOLAR := False // IN: BOOL ,RET_VAL := MW0 ,OUT := DB100.Out // OUT: REAL ); // WORD END_FUNCTION_BLOCK Sometimes during programming, new symbols for new ideas must be added on demand. Thanks again.
thequark Posts: 15 Rating: (0)
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12/31/2010 4:57 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/25/2025 Posts: 6885 Rating: (1368)	thequark I don't know how declare DB directions on Symbol Table. Anyhow I have tried with direct values on function and error persists: To implement symbolic name of an element in a data block, you just need to assign a symbol for the data block.For example you can assign 'analog' as name of DB100 in symbol table.After that time each element in data block has symbolic name which consist of data block's name and the element's name.I assign some symbolic names to your absolute addresses to get the result. RETVAL1 assigned to MW0 (INEGER) ANALOG.OUT assigned to DB10.DBD0 (REAL) FUNCTION_BLOCK FB7 VAR_TEMP END_VAR VAR END_VAR SCALE(IN := 1 // IN: INT ,HI_LIM := 5.0 // IN: REAL ,LO_LIM := 0.0 // IN: REAL ,BIPOLAR := False // IN: BOOL ,RET_VAL := RETVAL1//MW0 ,OUT := ANALOG.OUT// DB100.Out OUT: REAL ); // WORD END_FUNCTION_BLOCK Sometimes during programming, new symbols for new ideas must be added on demand. When you start new section of codes you should plan the names and types of variables. I hope this helps hdhosseini
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12/31/2010 9:40 AM	Rate (0)
jklm Posts: 1742 Rating: (309)	Hello, SCL knows two types of Functions (FC) - FC that do return a value - FC that do not return a value Your way ofcalling FC105is makingthe assumption thatFC105 does not return a value. But FC105 is a function that returns a WORD (an error code as return value) Therefore you must link the call to a variable accepting the return value. See a valid call in the document in annex. Just to see the difference in declaration: in my example FC5 is a function without return value (type = VOID). Attachment FC105call.pdf (1128 Downloads)
jklm Posts: 1742 Rating: (309)
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1/1/2011 1:21 PM	Rate (0)
thequark Posts: 15 Rating: (0)	That's OK. thank you very much for you. Now, I understand how works functions on SCL and necessary declarations and sintax. This is the the code ending and running... SymbolTableData := SCALE(IN := WORD_TO_INT(PEW128)// IN: INT ,HI_LIM := DB101.HiSensorPresion // IN: REAL ,LO_LIM := DB101.LowSensorPresion // IN: REAL ,BIPOLAR := False // IN: BOOL ,OUT := DB1.SimulacionPresion // OUT: REAL ); // WORD Thanks again.
thequark Posts: 15 Rating: (0)
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