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Create an function block

Created by: nickwang52 at: 10/12/2012 5:38 AM (7 Replies)

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10/12/2012 5:38 AM	Rate (0)
nickwang52 Posts: 7 Rating: (0)	hi~i want to create an FB. when i calling FB in the OB1,display "??"on parameter if no entering actual parameter. I know FB not necessary to assign actual parameters to the formal parameters,but if i having necessary parameter to be assigning.How can i do that? please forgive my poor english!!
nickwang52 Posts: 7 Rating: (0)
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10/12/2012 3:11 PM	Rate (0)
daad Gold Member Joined: 10/31/2011 Last visit: 4/8/2025 Posts: 400 Rating: (5)	Dear nickwang, To call a FB you have not only assign perameters as well as a DB(data block). So you can assign FB required parameters by DB or directly where it called. Regards

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10/15/2012 4:46 AM	Rate (0)
nickwang52 Posts: 7 Rating: (0)	Dear m.shoaib khatana: I know i can use DB for the parameters,but i want create some kind of FB like the legend.Some parameters they must be connected,and some pararmeters they can be connected or not. Attachment ex1.JPG (190 Downloads)
nickwang52 Posts: 7 Rating: (0)
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10/15/2012 5:38 AM	Rate (0)
Ayman Elotaify Diamond Expert Joined: 5/28/2008 Last visit: 12/23/2025 Posts: 4522 Rating: (843)	Hello, Did you read this thread? Difference between FB and FC's You will found an answer to your question there. Hope this helps.
	Ayman Elotaify
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10/15/2012 9:47 AM	Rate (0)
nickwang52 Posts: 7 Rating: (0)	Dear Ayman Elotaify: I appreciate you to provide the thread,now i know the difference between FCs and FBs.The FB's parameter can be ignored,but i still no idea about how to create an FB,it display"??".The question mark represent the parameter that must be connected!!
nickwang52 Posts: 7 Rating: (0)
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10/15/2012 11:16 AM	Rate (0)
Ayman Elotaify Diamond Expert Joined: 5/28/2008 Last visit: 12/23/2025 Posts: 4522 Rating: (843)	nickwang52 Dear Ayman Elotaify: I appreciate you to provide the thread,now i know the difference between FCs and FBs.The FB's parameter can be ignored,but i still no idea about how to create an FB,it display"??".The question mark represent the parameter that must be connected!! Each FB should be called with an instance DB. And thus why the FB comes with red marks when you call it. You have to define the instance data block for your FB. I hope I could understand your question corrctly.
	Ayman Elotaify
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10/16/2012 9:22 AM	Rate (0)
nickwang52 Posts: 7 Rating: (0)	Dear Ayman Elotaify: I want to create an "function",it maybe have some important parameter.And when i call the function,i hope the call statement display the parameter with red question mark "??".I don't know which is i needed?FC or FB? For example ,when i called the timer in the S7,the call statement display the "TV" parameter with red question mark "??".Can i create a function like this form? Attachment ex1.JPG (171 Downloads)
nickwang52 Posts: 7 Rating: (0)
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10/16/2012 9:26 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 12/24/2025 Posts: 9096 Rating: (1202)	Hello nickwang52, You want to create a function block, with input (and) output parameters? Open your FB, on top you will find a table, here you can assign "Input", "Output", "input-output", "stat" or "Temp" variables. And in FB, you can use these parameters. Best regards, Wizard

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