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function block problem

Created by: mcetin at: 9/26/2011 12:53 PM (10 Replies)

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9/26/2011 12:53 PM	Rate (0)
mcetin Experienced Member Joined: 7/9/2011 Last visit: 8/22/2024 Posts: 19 Rating: (0)	Hi everyone, I have a problem with usage of FB. I wrote a simple FB for increment a REAL according to input with a timer. And i created 3 instance DB for FB1 and called in OB1 for three times. But only first calling working properly, the others not. I have attached a VAT capture. I will send you the simple program. Attachment vat.JPG (169 Downloads)

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9/26/2011 1:09 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/11/2024 Posts: 6852 Rating: (1365)	mcetin Hi everyone, I have a problem with usage of FB. I wrote a simple FB for increment a REAL according to input with a timer. And i created 3 instance DB for FB1 and called in OB1 for three times. But only first calling working properly, the others not. I have attached a VAT capture. I will send you the simple program. Dear mcetin Would you please upload your codes(project) here.Why did not you use OB35 and its cyclic execution property instead of a timer? Best regards
	Demo Channel on Youtube
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9/26/2011 1:26 PM	Rate (0)
mcetin Experienced Member Joined: 7/9/2011 Last visit: 8/22/2024 Posts: 19 Rating: (0)	Thanks for reply, I am new at programming s7300. This is my code. Attachment fb_test2.zip (148 Downloads)

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9/26/2011 1:36 PM	Rate (0)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 5/3/2024 Posts: 5697 Rating: (715)	Hello, Can't open the project because off the language settings at your side. Please upload a English project. or post your sourcefile. Regards, Marcjan Attachment lang.JPG (140 Downloads)
	Last edited by: Marcjan at: 9/26/2011 1:37 PM Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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9/26/2011 1:50 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/11/2024 Posts: 6852 Rating: (1365)	Marcjan Hello, Can't open the project because off the language settings at your side. Please upload a English project. or post your sourcefile. Regards, Marcjan This may help Step7 project different language
	Demo Channel on Youtube
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This contribution was helpful to 1 thankful Users Marcjan

9/26/2011 2:01 PM	Rate (1)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/14/2024 Posts: 3024 Rating: (1054)	Hello mcetin your problem is caused by incorrect usage of TEMP variables. Put simple, TEMP variables are "lost" when the Block execution is finished (they do NOT retain their value which means you MUST always write to them first before you read from them). The simple fix in you case is to change the TEMP variable "REAL2" to a STAT variable and I hope this helps.
	Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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This contribution was helpful to 1 thankful Users mcetin

9/26/2011 2:09 PM	Rate (0)
mcetin Experienced Member Joined: 7/9/2011 Last visit: 8/22/2024 Posts: 19 Rating: (0)	Sorry, I don't know what should i do. There is a video attachment (screen2exe file). Next Step i will send you screen captures. Thanks Attachment fbtest.zip (131 Downloads)

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9/26/2011 2:11 PM	Rate (1)
Bhushan02 Posts: 7 Rating: (2)	Dear mcetin, i have checked your FB. theReal2 is taking some garbage value during execution as it is a temporary variable. So to solve this you can define Real2as STAT variable (just like bm1 & bm2). Regards, Bhushan
Bhushan02 Posts: 7 Rating: (2)
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This contribution was helpful to 1 thankful Users mcetin

9/26/2011 2:23 PM	Rate (0)
mcetin Experienced Member Joined: 7/9/2011 Last visit: 8/22/2024 Posts: 19 Rating: (0)	Mr. Fritz, That's it. Thank you very much. Can you suggest me the right manual for programming FB with DB also UDT. Thanks again. Sincerely yours.

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9/26/2011 2:54 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 10/14/2024 Posts: 3024 Rating: (1054)	Hello mcetin there's plenty of good reading material and help around and here's a few suggestions: 1.) Step 7's inbuilt help 2.) Go to "Start menu-SIMATIC-Documentation" and you'll findplenty of automatically installed pdf manuals 3.) Online tuorials at: http://support.automation.siemens.com/WW/view/en/34008480 4.) Manual links at All SIMATIC useful manuals 5.) Search for subjects at: https://support.automation.siemens.com P.S: One more thing about your FB: Make the used S5 Timers input to the FB so you can assignunique Timer numbers to every call. Alternatively use the SFB Timers from the IEC library as Multi Instance calls inside the FB. I hope this helps
	Last edited by: fritz at: 9/26/2011 3:14 PM typos Cheers fritz The advice and opinion given in this thread is that of the author and does not necessarily reflect the views of I S Systems Pty Limited. To find out how I S Systems can help you with your automation needs please visit www.issystems.com.au.
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