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function block

Created by: ryan03 at: 1/2/2011 6:25 AM (5 Replies)

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1/2/2011 6:25 AM	Rate (0)
ryan03 Experienced Member Joined: 11/9/2009 Last visit: 9/4/2024 Posts: 41 Rating: (0)	hi to every one i have a problem in function i create a instance data block in a function block after that i download it to plc when a go online the run mode is not running.i try to call that function block to ob1 and its give me an error,can any body tell me whats wrong in my program and why in fc block to run it is you need calling it in ob1 thank to any one who will reply to my question.happy new year.

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1/2/2011 7:11 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)	Dear member follow the instruction illustarted in chapter 5 (Creating a Program with Function Blocks and Data Blocks) and chapter 8 (Programming a Function) of THIS manual. Best regards
	Last edited by: hdhosseini at: 1/2/2011 7:14 AM Demo Channel on Youtube
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1/2/2011 5:48 PM	Rate (0)
Late Platinum Expert Joined: 1/7/2006 Last visit: 11/17/2023 Posts: 2705 Rating: (318)	Dear Ryan, You have to look in the diagnostic buffer which error is given why the CPU won't start. It could be something whats wrong in the programming, but it could also be that you forgot to load something (FB or DB for example).
	I hope that the answer will help, if you have still questions, don't hesitate to ask me. All the best, Late Never say never, think in solutions, not in trouble......
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1/3/2011 5:38 AM	Rate (0)
ryan03 Experienced Member Joined: 11/9/2009 Last visit: 9/4/2024 Posts: 41 Rating: (0)	hi mr late theres no alarm in when i check it dianostic buffer sr my question is did i need to program sometime in ob block to run the fb block?

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1/3/2011 5:59 AM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 9/10/2024 Posts: 10228 Rating: (1181)	Hello, Did you follow instructions from hdhosseini ' link? Basically steps are: 1. Create FB with own instance DB. 2. Download both in CPU. (first DB and then FB). 3. Call FB (foe example in OB1)... Best regards, Hristo Mihalev

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1/3/2011 2:09 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)	ryan3 my question is did i need to program sometime in ob block to run the fb block? The attachment is what you need a FB in OB1.Calling a function or a function block in a specific OB depends on the nature of that FB. Consider FB 58 "TCONT_CP" ought to be called in a cyclic manner so it is called in OB3X.If another FB determines the behavior of CPU while start up you should call it in (OB100,101,102) and finally diagnostic FBs should be called in corresponding OB. An FB is necessary to ba called in OB1, is executed in each scan of CPU for example a function to handle auxiliary parts of a machine. I hope this helps BR Attachment 1.zip (68 Downloads)
	Last edited by: hdhosseini at: 1/3/2011 2:19 PM Last edited by: hdhosseini at: 1/3/2011 2:10 PM //attachment added Demo Channel on Youtube
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