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FOR loop in Step 7 --- HOW ??

Created by: Gogy at: 1/12/2011 4:59 PM (32 Replies)

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1/12/2011 4:59 PM	Rate (0)
Gogy Advanced Member Joined: 9/15/2010 Last visit: 3/30/2011 Posts: 40 Rating: (1)	Hello. This is my problem. I have two ARRAYS, one is called INPUT, and the other is called WEIGHTS. Array INPUT has 50 elements, and WEIGHTS has 10 elements. This Variables are saved in my Data Block. With this two variables I need to calculate the output of neural network. Output of this network can be calculated with this code : for ( i=0 , i<50 , i++ ); { for ( j=0 , j<10 , j++ ): { SUM = SUM + INPUT [i] * WEIGHT [j] ; Y = 2/ (1 + EXP(-2 * SUM) ) -1 ; } } I know how to do this step by step in Step 7, (using STL or FBD). And it would be ok, if there is only one input, but with 50 input elements, it is too much job to do. I never tried to do anything that has conections with FOR loop in STEP 7. Can you give me some advice how to relize this in step 7 ?? My knowlege about step 7 and PLC is average. Thank you, Goran.

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1/12/2011 7:20 PM	Rate (2)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/15/2019 Posts: 6586 Rating: (1234)	Dear Gogy This is sample codes with SCL, Check how easy it is to implement your codes in SCL programming language: [code]FUNCTION FC1 : VOID VAR_TEMP // Temporary Variables END_VAR // Statement Section ; FOR i:=0 TO 50 DO FOR j:=0 TO 10 DO sum := sum + (input.input [i] * weight.weight [j]) ; Y := 2/ (1 + EXP(-2 * SUM) ) -1 ; ; END_FOR; END_FOR; END_FUNCTION [/code]
	Last edited by: hdhosseini at: 1/12/2011 7:21 PM Demo Channel on Youtube
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1/12/2011 7:26 PM	Rate (2)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/15/2019 Posts: 6586 Rating: (1234)	The attached file is the application program you needed with a complete symbol table. regards Attachment loop.zip (683 Downloads)
	Demo Channel on Youtube
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1/12/2011 11:25 PM	Rate (0)
Gogy Advanced Member Joined: 9/15/2010 Last visit: 3/30/2011 Posts: 40 Rating: (1)	Thank you very much, but I never worked with functions... And thoose files you sent me, i don't know what to do with them. Next question is. If I have this array INPUTS, and it is saved in DB1, and it has 50 elements. Can I modify this FOR loop, so that, elements are taken one by one from that array INPUTS in DB1 ???

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1/12/2011 11:33 PM	Rate (2)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/15/2019 Posts: 6586 Rating: (1234)	Gogy And thoose files you sent me, i don't know what to do with them. the attachment is the source code of the program.You can see the symbol table to check which memory area assigned to your original codes. Gogy Next question is. If I have this array INPUTS, and it is saved in DB1, and it has 50 elements. Can I modify this FOR loop, so that, elements are taken one by one from that array INPUTS in DB1 ??? Yes it is exactly done as you expect.Like writing loops in C or C++.You can consider FC1 as a standard written program, change input and weight parameters in DB1 and DB2 and see the result in Y which is defined in symbol table. hdhosseini
	Last edited by: hdhosseini at: 12/11/2014 5:39 PM Demo Channel on Youtube
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1/12/2011 11:50 PM	Rate (0)
Gogy Advanced Member Joined: 9/15/2010 Last visit: 3/30/2011 Posts: 40 Rating: (1)	Can you help me, step by step, to put this, what you have sent me, into my existing project ?? Or that is not posible ?? Goran.

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1/13/2011 12:07 AM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/15/2019 Posts: 6586 Rating: (1234)	OK, Please update symbol table as I did, you can assign arbitary absoulte address for parameters such as Y, sum and ... then create a SCL source in the "sources" block in your project. then open the blank source file, copy the SCL codes provided here then paste and compile.Now your FC1 is available to be used in OB1. it does not need any till now.Just change the inputs and weights and check the outputs. regards hdhosseini Attachment symbol table.jpg (454 Downloads)
	Last edited by: hdhosseini at: 1/13/2011 12:12 AM //snapshot of symbol table attached Last edited by: hdhosseini at: 1/13/2011 12:09 AM Demo Channel on Youtube
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1/13/2011 12:18 AM	Rate (0)
Gogy Advanced Member Joined: 9/15/2010 Last visit: 3/30/2011 Posts: 40 Rating: (1)	hdhosseini OK, Please update symbol table as I did, you can assign arbitary absoulte address for parameters such as Y, sum and ... Ok this part I dont understand complete, and truly i don't know how to do this :( hdhosseini then create a SCL source in the "sources" block in your project. then open the blank source file, copy the SCL codes provided here then paste and compile.Now your FC1 is available to be used in OB1. it does not need any till now.Just change the inputs and weights and check the outputs. regards hdhosseini This part is ok, and i know how to do this :) When i create source blok, i need to copy code from your first post ?? And change variables input and weights from DB1 .....

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1/13/2011 12:24 AM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/15/2019 Posts: 6586 Rating: (1234)	OK For symbol table, you need to define following parameters as shown in video attached, one entry is done as a sample. regards Attachment symbol table.zip (155 Downloads)
	Demo Channel on Youtube
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1/13/2011 12:38 AM	Rate (0)
Gogy Advanced Member Joined: 9/15/2010 Last visit: 3/30/2011 Posts: 40 Rating: (1)	Thank you. I did this. Now i have two questions. 1.) In my project Arrays INPUT and WEIGHTS, are in same Data Block (DB1). i see, in this symbol table, that is the problem?? 2.) If I, need to take another two arrays, for example , IWEIGHTS and OUTPUT , do I need to make New Data blocks for this two arrayd (DB3 and DB4) ?? Thank you.

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