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cpu313 c-2dp fb 41

Created by: veer at: 9/11/2011 11:11 AM (13 Replies)

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9/11/2011 11:11 AM	Rate (0)
veer Posts: 103 Rating: (0)	dear experts i m using fb 41 in my program i m facing the problem that when i downloadthis program in plc fb 41 doesnt workbut when i simulate it in plcsim it runs properly pls tell me what may be the possible causes for this and what i have to do thank
veer Posts: 103 Rating: (0)
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9/11/2011 3:57 PM	Rate (0)
Martins_Eng Experienced Member Joined: 7/17/2010 Last visit: 2/17/2024 Posts: 184 Rating: (0)	Hello mate, you are also carrying the DB for the FB41, and is calling for it also can perform the function. Another thing when you say that the plc does not work mean that enters Stop or block FB4 is not running?

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9/11/2011 8:29 PM	Rate (0)
UMENCHO Diamond Member Joined: 3/21/2006 Last visit: 11/1/2024 Posts: 10229 Rating: (1181)	Hello, Please attach here your sample project. best regards, Hristo MIhalev

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9/16/2011 10:10 AM	Rate (0)
veer Posts: 103 Rating: (0)	hi.... umencho i m here sending uthe my project take a lookon it i want to tell u that when i try to run this in plc its lmn ,error value do not get any change, pls find the attachment Attachment test_pid.zip (440 Downloads)
veer Posts: 103 Rating: (0)
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9/16/2011 10:41 AM	Rate (0)
Marcjan Platinum Member Joined: 4/22/2010 Last visit: 11/18/2024 Posts: 5697 Rating: (715)	Helo, There is no procesvariable PV_IN or PV_PER. And the output LMN_PER must be PQW not QW and the range starts at adress 752. Your TI is a bit short i think, start with 1 sec. 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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9/16/2011 11:00 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	veer i m here sending uthe my project take a lookon it i want to tell u that when i try to run this in plc its lmn ,error value do not get any change, pls find the attachment Dear veer Please refer to the following Tag in which 2 threads clustered. Those threads are about sample example projects to handle FB41. Standard PID Package - FB41 Samples The following points are strange for me: 1- small integration time of 100ms 2- using the whole block as a P controller by disabling I and D parts You have constant error signal because you are using a P controller in which error=P*(SP-PV) Also check the attachment for the online help of the function. Best regards Attachment 1.pdf (968 Downloads)
	Demo Channel on Youtube
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9/16/2011 2:04 PM	Rate (0)
veer Posts: 103 Rating: (0)	hi... marc if i didnt define pv_per this means not that i dont get lmn and i wanna tell u that this program run proprly in plc sim so why dont same action in actual plc. and also take look on this atttachment which shows area length error Attachment Diagnose.zip (304 Downloads)
veer Posts: 103 Rating: (0)
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9/16/2011 3:36 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	veer hi... marc if i didnt define pv_per this means not that i dont get lmn and i wanna tell u that this program run proprly in plc sim so why dont same action in actual plc. and also take look on this atttachment which shows area length error Hello again Please Note, you have problem in other FBs inside your project.To check FB41,just check the following modified version of your program.Besides, you need to change SP_INT,I also include it in your project,add I part to your algorithm and change the integration time to 10s. Best regards Attachment MODIFIED.zip (410 Downloads)
	Last edited by: hdhosseini at: 9/16/2011 3:38 PM Demo Channel on Youtube
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9/16/2011 9:25 PM	Rate (0)
veer Posts: 103 Rating: (0)	dear sir my older program which one u found in the attachment run correctly in plcsim means i get the output from pid block but when i try to run the same program in plc pid block not give any response even if db41 shows set input and process variable
veer Posts: 103 Rating: (0)
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9/17/2011 7:15 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	veer dear sir my older program which one u found in the attachment run correctly in plcsim means i get the output from pid block but when i try to run the same program in plc pid block not give any response even if db41 shows set input and process variable Hello again What do you mean " pid block not give any response"? Please check the following items: 1- change set point and check if error signal changes 2- bypass the algorithm by putting it in Manual mode as shown in attachment and check LMN parameter in databelock as output of FB41. Best regards Attachment FB41.JPG (423 Downloads)
	Last edited by: hdhosseini at: 9/17/2011 7:16 AM Demo Channel on Youtube
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