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IEC TIMER (TON) doesn't work as expected [SOLVED]

Created by: HYTL at: 11/25/2014 2:48 PM (7 Replies)

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11/25/2014 2:48 PM	Rate (1)
HYTL Regular Member Joined: 2/15/2011 Last visit: 6/5/2024 Posts: 2 Rating: (1)	Hi all, I'm on my first project on TIA Portal V13 with a S7-1515. I would like to use an IEC TON TIMER (like I did hundreds of time in Step 7 !!) I do a clock by connecting the inverted state of output Q in the input parameter of a TON timer. But the result is not a "1" at ouptur Q each time the timer is reached, but the output Q is active at a random rate !! To view this I put a counter increased by the output Q. ==> See the printscreens of the code and the trace Remark: it's the same bahaviour when I connect a variable at the output Q. I did the same in Step 7 V5.5 with a S7-315, and it works perfectly (the ouptu Q is activ each time the timer is reached) ==> See the printscreen of the code What's wrong ! That's catastrophic if we can't rely on a simple timer in TIA Portal... :-( Thanks Pascal PS: and it's catastrophic how much TIA Portal crashes when online... Attachment PrintScreen Files.zip (735 Downloads)
	Last edited by: HYTL at: 11/25/2014 3:22 PM
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11/25/2014 2:57 PM	Rate (1)
Jihosaft Bronze Member Joined: 8/3/2011 Last visit: 8/22/2024 Posts: 100 Rating: (7)	Hi, Try read this article.... https://www.dmcinfo.com/latest-thinking/blog/id/8862/categoryid/10/troubleshooting-your-siemens-simatic-s7-1200-timers Have a nice day....

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This contribution was helpful to 1 thankful Users William_B

11/25/2014 3:21 PM	Rate (0)
HYTL Regular Member Joined: 2/15/2011 Last visit: 6/5/2024 Posts: 2 Rating: (1)	hi, Thank you for your quick answer !! ==> OK it works as described in the article. The problem was when I used Timer.Q (before the call of the block) to read the state of the timer, the timer was UPDATED !!! These timers are updated each time the block is called and each time the .Q or . ET are read !! That's a big changement of behaviour with the S7-300 / S7-400 !!!! Best regards, Pascal

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11/25/2014 4:15 PM	Rate (0)
William_B Posts: 5225 Rating: (1193)	Jihosaft Hi, Try read this article.... https://www.dmcinfo.com/latest-thinking/blog/id/8862/categoryid/10/troubleshooting-your-siemens-simatic-s7-1200-timers Have a nice day.... Hi guys. Thank you for the question HYTL. Thank you Jihosaft, this can easily win the prize for the Best Tip of the Month.. it sure has my vote! Greetings. w
William_B Posts: 5225 Rating: (1193)
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11/25/2014 8:05 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/15/2024 Posts: 15316 Rating: (2431)	William B. Jihosaft Hi, Try read this article.... https://www.dmcinfo.com/latest-thinking/blog/id/8862/categoryid/10/troubleshooting-your-siemens-simatic-s7-1200-timers Have a nice day.... Hi guys. Thank you for the question HYTL. Thank you Jihosaft, this can easily win the prize for the Best Tip of the Month.. it sure has my vote! Greetings. w And I thought it was my misunderstanding. I simply got in the habit of putting a N.O. with the timer.Q output on the NO contact to pass the signal of the Timer to another bit. That's some interesting trivia that makes my work-around make sense. ...ENA...........TMR_DB.........TMR_DB.Q......TMR_DONE ----\| \|--------[ IEC_TIMER ]------------\| \|----------------( )-------- Then use TMR_DONE as you would naturally think of TMR_DB.Q That's what I have been doing since V10.5 of the portal. It was the only way I could get consistent results. Now it's habit.
	science guy
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11/25/2014 9:53 PM	Rate (0)
William_B Posts: 5225 Rating: (1193)	huggy_d1 ...ENA...........TMR_DB.........TMR_DB.Q......TMR_DONE ----\| \|--------[ IEC_TIMER ]------------\| \|----------------( )-------- What about?.. ...ENA...........TMR_DB...............TMR_DONE ----\| \|--------[ IEC_TIMER ]-------------------( )--------
William_B Posts: 5225 Rating: (1193)
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11/25/2014 11:21 PM	Rate (0)
0_Einstein Diamond Expert Joined: 7/7/2010 Last visit: 10/15/2024 Posts: 15316 Rating: (2431)	William B. huggy_d1 ...ENA...........TMR_DB.........TMR_DB.Q......TMR_DONE ----\| \|--------[ IEC_TIMER ]------------\| \|----------------( )-------- What about?.. ...ENA...........TMR_DB...............TMR_DONE ----\| \|--------[ IEC_TIMER ]-------------------( )-------- Mixed results that seem portal and plc firmware dependent. The other way has never failed me whereas I try the suggested approach and while it usually works, there are situations where it would act contrary to common sense. I would count the TMR_DONE coil being on and it would never come on even though while online you could see the ET rise and fall just like you would expect. Strange stuff these IEC_TIMERs.
	science guy
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This contribution was helpful to 1 thankful Users William_B

7/7/2022 4:08 PM	Rate (0)
fpramanik Regular Member Joined: 10/4/2019 Last visit: 8/20/2024 Posts: 14 Rating: (1)	Please check out of IEC Timer function... How to use IEC timer?
	Last edited by: Jen_Moderator at: 07/26/2022 11:52:51 Video embedded.
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