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SCL: Read REAL from DB?

Created by: Rasmus Balle at: 4/17/2013 1:27 PM (10 Replies)

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4/17/2013 1:27 PM	Rate (0)
Rasmus Balle Posts: 41 Rating: (0)	Hello. I'm n00b to SCL, and trying to get started. It's going OK so far - untill i should read/write a value direct to a REAL in a DB. Isn't it possible to do this, without using pointers, if i had declared the datatype in the DB (shared DB) It could be: db20.dbd10 := 10.0 ; Why doesn't this work?
Rasmus Balle Posts: 41 Rating: (0)
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4/17/2013 2:07 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/15/2025 Posts: 6875 Rating: (1368)	Rasmus Balle Hello. I'm n00b to SCL, and trying to get started. It's going OK so far - untill i should read/write a value direct to a REAL in a DB. Isn't it possible to do this, without using pointers, if i had declared the datatype in the DB (shared DB) It could be: db20.dbd10 := 10.0 ; Why doesn't this work? Hello, If you defined a symbol name for DB20,Try the following method: "name of DB in symbol table"."name of cell" :=10.0; try and update Best regards Hamid Hosseini
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4/17/2013 2:52 PM	Rate (0)
Rasmus Balle Posts: 41 Rating: (0)	If i do this: FUNCTION FC160 : INT VAR_TEMP // Temporary Variables END_VAR // Statement Section IF m8.1 = True THEN db20.dbd114 := 10.0 ; END_IF FC160 := 100 ; END_FUNCTION I get an error saying "Invalid Data Type", but if i change 50.0 to 50, then the compiler accepts it. Seems like the compiler thinks it's a DWORD, not a REAL I also get an error at the END_FUNCTION saying "Unknown Statement; Possibly missing Semicolon". What can this be?
Rasmus Balle Posts: 41 Rating: (0)
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4/17/2013 5:33 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/15/2025 Posts: 6875 Rating: (1368)	Rasmus Balle If i do this: FUNCTION FC160 : INT VAR_TEMP // Temporary Variables END_VAR // Statement Section IF m8.1 = True THEN db20.dbd114 := 10.0 ; END_IF FC160 := 100 ; END_FUNCTION I get an error saying "Invalid Data Type", but if i change 50.0 to 50, then the compiler accepts it. Seems like the compiler thinks it's a DWORD, not a REAL I also get an error at the END_FUNCTION saying "Unknown Statement; Possibly missing Semicolon". What can this be? Hello, note, before starting programming you should complete the symbol table of whole project( or develop it slightly).DWORD and REAL just have same data width (32 bit) but they have different data structure.In SCL,There are plenty of data conversion that may assist you while programming. For your working codes, you just missed a semicolon as I add it in mine(In line 11). [code] FUNCTION FC160 : INT VAR_TEMP // Temporary Variables END_VAR // Statement Section IF m8.1 = True THEN db20.dbd114 := 10 ; END_IF; //HERE FC160 := 100 ; END_FUNCTION[/code] Best regards Hamid Hosseini
	Last edited by: hdhosseini at: 4/17/2013 5:36 PM Demo Channel on Youtube
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5/1/2013 3:30 PM	Rate (0)
Rasmus Balle Posts: 41 Rating: (0)	Okay, the ; made some of the faults :) But i'm still getting an error if i try to: db20.dbd14 := 10.0 ; Then i get a fault, even since the data is created in DB20 as a REAL. If i then: MD108 := 10.0 ; The compiler accepts it - why can't i address directly in a DB?
Rasmus Balle Posts: 41 Rating: (0)
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5/1/2013 4:16 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/15/2025 Posts: 6875 Rating: (1368)	Rasmus Balle Okay, the ; made some of the faults :) But i'm still getting an error if i try to: db20.dbd14 := 10.0 ; Then i get a fault, even since the data is created in DB20 as a REAL. If i then: MD108 := 10.0 ; The compiler accepts it - why can't i address directly in a DB? Hello, Normally , if you defined all symbols related to each element there shouldn't be any error from compiler.My suggestion would be sharing your project plus some snapshots of errors you encountered.You can check my test with snapshots of my symbol table. [code] ORGANIZATION_BLOCK OB1 VAR_TEMP // Reserved info : ARRAY[0..19] OF BYTE; // Temporary Variables END_VAR // Statement md100:=0; //double word md104:=0.0; //real sample.test_r:=0.0; //real sample.test_d:=0; //double word ; END_ORGANIZATION_BLOCK[/code] Best regards Hamid Hosseini Attachment symbol.zip (467 Downloads)
	Last edited by: hdhosseini at: 5/1/2013 4:25 PM Demo Channel on Youtube
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5/1/2013 4:25 PM	Rate (0)
dchartier Grandmaster Joined: 9/27/2006 Last visit: 9/16/2025 Posts: 12409 Rating: (2717)	Hello Rasmus; Just a thought. How is the address db20.dbd14 defined in your DB? Has it been declared as a REAL value? If it is not, then you will always get a datatype error when you try to load a floating-point value (such as 10.0) to that address. Hope this helps, Daniel Chartier

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5/1/2013 4:38 PM	Rate (0)
Rasmus Balle Posts: 41 Rating: (0)	Hello :) Yes it's defined as a REAL in the DB - that's what i think is weird... :S But i can try make another DB with some REAL values
Rasmus Balle Posts: 41 Rating: (0)
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5/1/2013 11:32 PM	Rate (1)
Berg Silver Member Joined: 1/17/2006 Last visit: 7/14/2025 Posts: 554 Rating: (29)	Hi. Take a look at the following link: Why is the following error message displayed when a REAL value is assigned: "Invalid data type"? Best regards.

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This contribution was helpful to 1 thankful Users dchartier

5/2/2013 7:13 AM	Rate (0)
Rasmus Balle Posts: 41 Rating: (0)	Thx Alot Berg, that solved my problem.. Great - Thx all :)
Rasmus Balle Posts: 41 Rating: (0)
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