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Determing Minimum Value.

2/25/2011 10:40 AM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 1/2/2026 Posts: 731 Rating: (43)	Hi all, I'm trying to program a function that determines the minimum value of a signal during an hour. This is a continious process. I've made a function (loop) that writes a value into a DB every 2 sec. When the DB is full, it starts overwriting from the beginning. That seems to be working just fine. Now I want to determine the lowest value of this entire block (1800 values) . Does anyone know an standard function that can do this? Ton

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2/25/2011 3:35 PM	Rate (1)
Marcjan Diamond Member Joined: 4/22/2010 Last visit: 3/31/2025 Posts: 5697 Rating: (716)	Thinking of this: copy the values to another DB, then do a sort function http://support.automation.siemens.com/WW/view/en/865058 Then you know where the Minimum Value is.
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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This contribution was helpful to 1 thankful Users Ton Verra

2/25/2011 3:48 PM	Rate (1)
jacek d Platinum Expert Joined: 9/23/2005 Last visit: 1/16/2026 Posts: 5155 Rating: (772)	I'd go for something else.Write small routine which compares actual value from DB with some stored variable. If actual value is less then stored, replace stored by actual. Initialise this stored variable with highest possible value and run comparison thru whole DB. When finished you have your lowest value.
	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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This contribution was helpful to 1 thankful Users Ton Verra

2/25/2011 4:16 PM	Rate (0)
Ton Verra Gold Member Joined: 4/20/2007 Last visit: 1/2/2026 Posts: 731 Rating: (43)	Hi! Thanks for the answers. I used the second alternative.. I scan the entire block for the lowest value. If this value is higher then the stored value, it overwrites it. The DB has 1800 samples to compare, in about 3 minutes. This is my code: L #DataBlockSample T #DBNR L #DataBlockCurrent T #DBNRCUR OPN DB [#DBNR] L DBW [DBD 4] L #MinValue_1 <I JCN JMP0 L DBW [DBD 4] T #MinValue_1 T #MinValue JMP0: OPN DB [#DBNRCUR] L DBD 0 L P#2.0 +D T DBD 0 OPN DB [#DBNR] T DBD 4 L DBLG SLD 3 >D JNB JMP1 OPN DB [#DBNRCUR] L P#8.0 T DBD 0 OPN DB [#DBNR] T DBD 4 A( L #MinValue_1 L #MaksMinValue_1 >I ) JNB _001 L #MinValue_1 T #MaksMinValue_1 _001: L #MaksMinValue_1 T #MaksMinValue L 27000 T #MinValue_1 BEU JMP1: NOP 0
	Last edited by: Ton Verra at: 2/28/2011 7:48 AM found flaw in code.
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This contribution was helpful to 1 thankful Users Marcjan

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