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how can i do the positive & negitive edge in SCL?

Created by: Saradhi at: 10/3/2012 4:08 AM (14 Replies)

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10/3/2012 4:08 AM	Rate (0)
Saradhi Posts: 303 Rating: (3)	It's Working, how can i do the positive & negitive edge in SCL.
Saradhi Posts: 303 Rating: (3)	Last edited by: O_Moderator at: 10/4/2012 12:25 PM new subject after splitting from /tf/WW/en/Posts/80956#top
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10/3/2012 12:46 PM	Rate (0)
yy1 Posts: 535 Rating: (112)	Dear Saradhi, here's an example for a detection of a positive edge. [code] FUNCTION_BLOCK "Edge_Detection" VAR_INPUT Signal : Bool; END_VAR VAR SignalOld : Bool; END_VAR VAR_TEMP edge : Bool; END_VAR BEGIN #edge:= #Signal AND NOT #SignalOld; #SignalOld:=#Signal; IF #edge THEN ;//code END_IF; END_FUNCTION_BLOCK [/code] Hope this helps. Best regards, yy1
yy1 Posts: 535 Rating: (112)
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10/6/2012 9:26 AM	Rate (0)
Saradhi Posts: 303 Rating: (3)	Getting Error while creating FB Attachment Error in creating FB.gif (3594 Downloads)
Saradhi Posts: 303 Rating: (3)
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10/6/2012 9:34 AM	Rate (0)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Hello, Give that block a number like FB1 or create a symbolic name in the symbol table and it will compile. Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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10/6/2012 9:54 AM	Rate (0)
Saradhi Posts: 303 Rating: (3)	Please check the attachment Attachment Error in creating FB1.gif (1879 Downloads)
Saradhi Posts: 303 Rating: (3)
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10/6/2012 10:25 AM	Rate (2)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 12/29/2025 Posts: 6889 Rating: (1368)	Saradhi Please check the attachment Try this: [code]FUNCTION_BLOCK FB1 VAR_INPUT Signal : Bool; END_VAR VAR SignalOld : Bool; END_VAR VAR_TEMP edge : Bool; END_VAR BEGIN edge:= Signal AND NOT SignalOld; SignalOld:=Signal; IF edge THEN ;//code END_IF; END_FUNCTION_BLOCK[/code] Attachment source.jpg (2990 Downloads)
	Last edited by: hdhosseini at: 11/07/2019 14:34:06 Demo Channel on Youtube
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This contribution was helpful to 2 thankful Users yy1 reve123

10/8/2012 11:07 AM	Rate (0)
Saradhi Posts: 303 Rating: (3)	Thanks You, above code is working fine. Instead of taking signal from outside i want to take the signal when the block is enable. i.e, When we give EN signal to the FUNCTION. but my output is incrementing only once. is my below code is right or not. FUNCTION fc1: BOOL VAR PE : BOOL; OldPE : BOOL; PEdge : BOOL; END_VAR VAR_OUTPUT Calc : INT; END_VAR BEGIN PE := 1; PEdge := PE AND NOT OldPE; OldPE := PE; IF PEdge THEN Calc := Calc + 1; END_IF; fc1 := 1; END_FUNCTION Attachment Untitled.gif (1768 Downloads)
Saradhi Posts: 303 Rating: (3)	Last edited by: Saradhi at: 10/8/2012 11:09 AM
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10/8/2012 11:48 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	Sorry, but it's wrong. I don't mean code itself, BUT if you use function (and not FB) you don't have STAT variables. On the other hand storing #OldPE variable in TEMP area is just wrong - result would be unpredictable.
Aret Posts: 2348 Rating: (265)
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10/8/2012 11:53 AM	Rate (0)
Saradhi Posts: 303 Rating: (3)	Please correct the code if possible
Saradhi Posts: 303 Rating: (3)
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10/8/2012 12:07 PM	Rate (0)
Aret Posts: 2348 Rating: (265)	Correct code is presented above by hdhosseini. The only thing you should add is your counter logics as IF edge then countr := countr+1; END_IF; Or you have some problem with code above?
Aret Posts: 2348 Rating: (265)
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This contribution was helpful to 1 thankful Users hdhosseini

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