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Reset counter in ON _DELAY _TIMER

6/13/2010 11:30 AM	Rate (0)
toinhatminh2 Posts: 65 Rating: (1)	Hello guy! I want to execute Q0.0 in period time.(attach file) it only run once time T37 still run to 37767, i don't know how to reset this counter to zero can you show me how to reset conter in Ondelay Timer? How many way to do this? I don't understand why vw200<vw32 ,counter in Ondelay timer not reset to zero When vw200>vw32 counter continue count to 32767 ? i hope receive your help thanks a lot Attachment untitled.GIF (238 Downloads)
toinhatminh2 Posts: 65 Rating: (1)	Last edited by: toinhatminh2 at: 6/13/2010 12:43 PM
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6/13/2010 2:57 PM	Rate (0)
AMAZINGAHMED Gold Member Joined: 8/27/2006 Last visit: 10/22/2024 Posts: 719 Rating: (88)	Why you put a timer T38 after a positive edge?? It's not logical. The positive edge is only an edge. I think it can't operate a timer. You can put Q0.0 after the positive edge. T37 will be reset if VW200 is smaller than vw32.
	The more you know, The more you know that you don't know
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6/13/2010 4:16 PM	Rate (0)
Saravana kumar Gold Member Joined: 2/6/2009 Last visit: 9/1/2025 Posts: 940 Rating: (119)	Deartoinhatminh2, The answer for your query is in the attachment, I thing it will be useful. Revert back for any clarification. Attachment Logic.zip (267 Downloads)
	_______________________________________________________________ Best Regards T.Saravana Kumar "All for the Best"
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6/13/2010 6:40 PM	Rate (1)
pfuser Silver Member Joined: 9/18/2006 Last visit: 5/31/2025 Posts: 596 Rating: (64)	Hi. From "Understanding the S7-200 Timer Instructions": The current value of a 100-ms timer is updated only if the timer instruction is executed. Consequently, if a 100-ms timer is enabled but the timer instruction is not executed each scan cycle, the current value for that timer is not updated and it loses time. Likewise, if the same 100-ms timer instruction is executed multiple times in a single scan cycle, the number of 100-ms intervals are added to the timer’s current value multiple times, and it gains time. 100-ms timers should only be used where the timer instruction is executed exactly once per scan cycle. Best regards.

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6/15/2010 10:09 AM	Rate (1)
Aristotelis Posts: 147 Rating: (34)	Hi toinhatminh2 I want to execute Q0.0 in period time.(attach file) it only run once time T37 still run to 37767, i don't know how to reset this counter to zero Can you please explain what are you trying to do? So far I understand that you want to set Q0.0. What I don't seem to get is WHEN do you want this to happen? What is the logic behind it? Are you trying to accomplish some kind of PWM on Q0.0? toinhatminh2 can you show me how to reset conter in Ondelay Timer? How many way to do this? I would suggest you take a look in the S7-200 System Manual in pp.196 Timer Instructions. It explains quite thoroughly how many ways there are, as well as how to reset it. Hope this helps
Aristotelis Posts: 147 Rating: (34)
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6/16/2010 3:03 PM	Rate (0)
toinhatminh2 Posts: 65 Rating: (1)	Hi AMAZINGAHMED It logic when i put T38 after positive edge. it will not reset when vw200<=vw32 Thanks for your relying anyway
toinhatminh2 Posts: 65 Rating: (1)
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