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How to reset instance data block

Created by: ram1234 at: 11/22/2011 1:05 PM (4 Replies)

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11/22/2011 1:05 PM	Rate (0)
ram1234 Posts: 2 Rating: (0)	hello, I am new to the plc programming. now i am working in scl. i wanted to reset the variables i used in the function block. so how can i reset the variables.I think values of the variables are stored in instance data block. if it is correct then how can i reset the values.? thank you
ram1234 Posts: 2 Rating: (0)
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11/22/2011 1:15 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	ram1234 hello, I am new to the plc programming. now i am working in scl. i wanted to reset the variables i used in the function block. so how can i reset the variables.I think values of the variables are stored in instance data block. if it is correct then how can i reset the values.? thank you Dear ram1234 , I think restart strategy used in following codes "FB67" would be helpful.It is prior to execution remanent codes of the FB and initialize the algorithm to predetermined values. [code] FUNCTION_BLOCK FB67 TITLE ='rate limiter' AUTHOR : hdhosseini VERSION : '1.0' // Block Parameters VAR_INPUT // Input Parameters input:REAL; rst:BOOL:=false; step:REAL:=0.1; //100ms call factor:REAL:=1.0; high:REAL:=100; low:REAL:=0; END_VAR VAR_IN_OUT // I/O Parameters first:BOOL:=true; END_VAR VAR_OUTPUT // Output Parameters out:REAL; END_VAR VAR_TEMP // Temporary Variables END_VAR VAR // Static Variables buffer:REAL:=0; in:REAL; END_VAR // Statement Section //////////////RESET/////////////////////////////////////// IF rst=true THEN buffer:=0; //first:=true; out:=0; in:=0; ; ///////////////////////////////////////////////////// ELSE IF first= true THEN buffer:=in; first:=false; END_IF; IF input >= high THEN in:=high; END_IF; IF input <= low THEN in:=low; END_IF; IF (input > low) AND (input<high) THEN in:=input; END_IF; IF in > (buffer+step) THEN buffer:= (buffer+(step* factor)); END_IF; IF in < (buffer-step) THEN buffer:= (buffer-(step*factor)); END_IF; IF in = buffer THEN buffer:=in; END_IF; ; out:= buffer; END_IF; ; END_FUNCTION_BLOCK[/code] Best regards, Hamid Hosseini Attachment reset.gif (576 Downloads)
	Last edited by: hdhosseini at: 11/22/2011 1:20 PM //Attachment added Demo Channel on Youtube
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11/22/2011 1:41 PM	Rate (0)
ram1234 Posts: 2 Rating: (0)	Thanks for giving me reply.. i had a look at ur example code. but my case is... i have used a variable "state" and i have around 9 states in my program. while the program is runnig, if press stop button then the whole system gets stoped, then if i press reset button all outputs are getting reseted but only the variable "state" is not comming to initial value..it is getting stucted at the state where the stop button is pressed.(example : state 7 or 5 or 4 or etc)..
ram1234 Posts: 2 Rating: (0)
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11/22/2011 1:53 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/5/2026 Posts: 6892 Rating: (1368)	ram1234 Thanks for giving me reply.. i had a look at ur example code. but my case is... i have used a variable "state" and i have around 9 states in my program. while the program is runnig, if press stop button then the whole system gets stoped, then if i press reset button all outputs are getting reseted but only the variable "state" is not comming to initial value..it is getting stucted at the state where the stop button is pressed.(example : state 7 or 5 or 4 or etc).. Dear ram1234 , We have no image of structure of your program.As I mentioned before "Restarting" should be prior to other part of program such as "Holding".Inorder to implement so, I think nesting algorithm section according their priority would be a great help as shown below: [code]If restart then //Reset the algorithm ///////////////// Else If hold then //Hold the algorithm Else //Normal execution End if /////////////// End if[/code] Hope this helps Best regards, Hamid Hosseini
	Demo Channel on Youtube
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11/28/2011 7:08 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	Ok, seems you need to do following: open cross-reference (Ctrl+Alt+R in Step 7 Manager), find ALL your states - where do they read and wrote (please mention, that indirect addressing could be the problem - it can be unresolved in Cross-ref). Then you can discover all memory cells where your State is stored. On hitting reset button - just overwrite all these values simultaneously. If your button cuts power off - then write this logic in OB10x.
Aret Posts: 2348 Rating: (265)
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