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Problem with FB41

8/26/2010 11:28 AM	Rate (0)
itechs Posts: 3 Rating: (0)	Hi. I need help on this one. Please correct my inputs if u see it's wrong. i have a tank wich is 12 liters. an ultrasound sensor as my input. 0-10v wich i scale in fc105. Motor with a frequency inverter. i dont get output on LMN, what am i doing wrong? please help Attachment pid1.JPG (330 Downloads)
itechs Posts: 3 Rating: (0)	Last edited by: itechs at: 8/26/2010 11:29 AM
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8/26/2010 11:37 AM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/17/2025 Posts: 3049 Rating: (1062)	Hello itechs the first thing to correct is how you use your MD's (Memory Doublewords). You've created so called "obverlapping access" by using MD22 and MD23 which needs to be rectified (if MD22 is used, the next "free" "M" address starts at MB 26). Have a look at THIS thread for more on this subject. Should your logic still have problems onceyou fixed this up, zip up your S7 project and post it here (rather than a screendump,it will help us in helping you). I hope this helps
	Last edited by: fritz at: 8/26/2010 11:39 AM 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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8/26/2010 12:03 PM	Rate (0)
itechs Posts: 3 Rating: (0)	yeh forgot to use the MD's rigth, but it still wont work. here is my zip dont laugh at me if it is totaly wrong Attachment PID.zip (339 Downloads)
itechs Posts: 3 Rating: (0)	Last edited by: itechs at: 8/26/2010 12:15 PM Last edited by: itechs at: 8/26/2010 12:07 PM
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8/26/2010 12:27 PM	Rate (0)
fritz Diamond Expert Joined: 10/7/2005 Last visit: 9/17/2025 Posts: 3049 Rating: (1062)	Hello again itechs quickly ran your program through PLCSIM and it does in general work. Only thing to be mindful of is that you use I0.0 to SET M0.0 (M0.0 being your Always ON flag). As I0.0 is also used as the COM_RST input to FB41, your PID willNOT do anything as long as I0.0 stays ON.
	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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8/26/2010 12:35 PM	Rate (0)
itechs Posts: 3 Rating: (0)	ok thanks, i will try this tomorrow. Really gratefull to all help.
itechs Posts: 3 Rating: (0)
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This contribution was helpful to 1 thankful Users fritz

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