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Timer operation

Created by: mf78 at: 2/26/2021 2:09 PM (5 Replies)

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2/26/2021 2:09 PM	Rate (0)
mf78 Member Joined: 4/8/2019 Last visit: 10/23/2024 Posts: 4 Rating: (0)	Hello, everyone. Please explain why this code does not work: "IEC_Timer_0_DB".TP(IN := #start_blink, PT := T#10s, Q => "DataBlock".Blink); IF "DataBlock".Blink = TRUE THEN #start_blink := FALSE; END_IF; "IEC_Timer_0_DB_1".TP(IN:=NOT "DataBlock".Blink, PT:=T#10s); IF "IEC_Timer_0_DB_1".Q = FALSE THEN #start_blink := TRUE; END_IF; But this one works: "IEC_Timer_0_DB".TP(IN := NOT "IEC_Timer_0_DB_1".Q , PT := T#10s, Q => "DataBlock".Blink); "IEC_Timer_0_DB_1".TP(IN:=NOT "IEC_Timer_0_DB".Q, PT:=T#10s); Best regards, Denis.

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2/26/2021 2:43 PM	Rate (0)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 9/24/2025 Posts: 5121 Rating: (768)	What is #start_blink? TEMP maybe?
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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2/26/2021 3:43 PM	Rate (0)
mf78 Member Joined: 4/8/2019 Last visit: 10/23/2024 Posts: 4 Rating: (0)	Yes.

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2/26/2021 3:58 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 9/25/2025 Posts: 12426 Rating: (2718)	Herllo mf78; You must never trust that a TEMP variable has a specific value when you call the FC. You must test it and set it to the correct value before it is used. This is due to the fact that the local stack (where the TEMP variables for all functions are stored in the PLC) is reused for all functions, so you have no idea what the value of a specific local variable has when you call a new FC. There are many discussions on the forum concerning problems with TEMP variables, this is one example: https://support.industry.siemens.com/tf//ww/en/posts/using-local-data-within-a-fc/61465/?page=0&pageSize=10 Hope this helps, Daniel Chartier
	Last edited by: dchartier at: 02/26/2021 16:31:21
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2/26/2021 4:02 PM	Rate (1)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 9/24/2025 Posts: 5121 Rating: (768)	mf78 Yes. Then if this code is in an FB, move it to STAT. If not, use a bool variable defined in a DB instead.
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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2/26/2021 4:07 PM	Rate (0)
mf78 Member Joined: 4/8/2019 Last visit: 10/23/2024 Posts: 4 Rating: (0)	dchartier, jacek d, thank you. I got it!

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