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Runtime monitoring regardless of CPU and OB (cycle time)

Created by: banconi at: 5/12/2014 2:31 PM (12 Replies)

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5/12/2014 2:31 PM	Rate (0)
banconi Silver Member Joined: 3/19/2010 Last visit: 10/26/2024 Posts: 438 Rating: (12)	Hello, To be simple, I want to make a FB that has working hours monitoring for pumps and ventilators, which will be universal, whoever uses it and wherever uses it. To be more complex, I have read many topics about this, but it turns out that any timer I choose, I have to somehow be aware of the cycle time that I am calling my FB in. My second gess was to count seconds with the rising edge of the clock memory byte (bit for 1 second), MB0 for example. But then again, I am related to the free choice of the clock byte usage. My college for example more prefer MB10, so we must be very carefull when we interchange software, and when we are starting new project. Finally, I just want to put my FB into the program, so it can start working and counting hours immedieatly, without any further connections. To be simple once again, I want to make FB for motors and ventilators, similar to that one from the BST_EXAMPLE project, that has the capability for measuring the working hours. As simple as that. I am sure there are some examples and ideas for this, and I am greatful in advance for the good advice.
	Last edited by: banconi at: 5/12/2014 2:36 PM
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5/12/2014 2:46 PM	Rate (0)
manmeet Gold Member Joined: 1/3/2006 Last visit: 2/19/2024 Posts: 726 Rating: (71)	Hi Increment your regeister by one in interupt OB35. Say for example OB35 is set to 100ms and now if your register is incremented by 10 then 1 seconds has lapsed.CPU abondons normal cycle time to execute the logic in interupt OB hence your timer is free of OB1 cycle time. Regards Manmeet

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5/12/2014 3:10 PM	Rate (0)
banconi Silver Member Joined: 3/19/2010 Last visit: 10/26/2024 Posts: 438 Rating: (12)	Unfortunately, this is not what I am lookin for, because this way I am related tho the chosen OB. I want to make an FB that is "OB free", that is, to have the timer of seconds measurement in whichever OB the FB is called from.

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5/12/2014 3:26 PM	Rate (1)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	banconi Unfortunately, this is not what I am lookin for, because this way I am related tho the chosen OB. I want to make an FB that is "OB free", that is, to have the timer of seconds measurement in whichever OB the FB is called from. Hello, For measuring duration of pulse, I suggest using SFC64.It is a system function and it is running independent of program execution by OS of CPU.Check the following sample with an important notice on boundary condition limit of TIME data type. Question about a programm Dependency of all your program is minimal due to using a system function, but you still should enable and disable the measurement in user program.If this option is really important, try to use interrupt OBs to start and stop timing. I hope this helps, Hamid Hosseini
	Last edited by: hdhosseini at: 5/12/2014 3:27 PM Demo Channel on Youtube
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5/12/2014 3:36 PM	Rate (1)
Madhava Silver Member Joined: 11/26/2011 Last visit: 6/29/2023 Posts: 508 Rating: (23)	Hi, I Hope the following example helps you and meets your criteria. link

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5/12/2014 6:21 PM	Rate (0)
kriipc Silver Member Joined: 4/11/2011 Last visit: 10/7/2024 Posts: 132 Rating: (7)	The system time is a "time counter" counting cyclically from 0 to a maximum of 2147483647 ms (more then 24H) May be more than 24 days?
	I'm just a human. Mistakes are allowed. Sorry for my english. Only 3 months of training and manuals :)
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5/12/2014 9:56 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	kriipc The system time is a "time counter" counting cyclically from 0 to a maximum of 2147483647 ms (more then 24H) May be more than 24 days? It is easy, when the duration is more than 24 days, the runtime meter starts from 0 again.Capture the initial time value , save it as the initial value.Capture the final value and use this formula: ((Max limit of TIME) - Initial value) +final value it is easy arithmatic
	Last edited by: hdhosseini at: 5/12/2014 11:27 PM Demo Channel on Youtube
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5/13/2014 11:00 PM	Rate (0)
kriipc Silver Member Joined: 4/11/2011 Last visit: 10/7/2024 Posts: 132 Rating: (7)	hdhosseini kriipc The system time is a "time counter" counting cyclically from 0 to a maximum of 2147483647 ms (more then 24H) May be more than 24 days? It is easy, when the duration is more than 24 days, the runtime meter starts from 0 again.Capture the initial time value , save it as the initial value.Capture the final value and use this formula: ((Max limit of TIME) - Initial value) +final value it is easy arithmatic Yes. I am pointing that2 147 483 647 ms is not about 24 hours but 24 days.
	I'm just a human. Mistakes are allowed. Sorry for my english. Only 3 months of training and manuals :)
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5/14/2014 4:51 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 10/26/2024 Posts: 6852 Rating: (1365)	kriipc hdhosseini kriipc The system time is a "time counter" counting cyclically from 0 to a maximum of 2147483647 ms (more then 24H) May be more than 24 days? It is easy, when the duration is more than 24 days, the runtime meter starts from 0 again.Capture the initial time value , save it as the initial value.Capture the final value and use this formula: ((Max limit of TIME) - Initial value) +final value it is easy arithmatic Yes. I am pointing that2 147 483 647 ms is not about 24 hours but 24 days. The maximum value for a 32- bit TIME variable would be "T#24d20h31m23s647ms" or (7FFF_FFFF hex).I could not find anywhere in my post refering to a wrong number.It would be nice , you quote the wrong value and mark it and ask for correction.
	Demo Channel on Youtube
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5/14/2014 6:22 AM	Rate (1)
kriipc Silver Member Joined: 4/11/2011 Last visit: 10/7/2024 Posts: 132 Rating: (7)	My mistake. I pointed to text in Madhavas linkedwebsite. There is: "The system time is a "time counter" counting cyclically from 0 to a maximum of 2147483647 ms (more then 24H). In case of an overflow the system time is counted again starting with 0. (this means that all my functions have a problem if the PLC is running longer then 1 day!!")
	I'm just a human. Mistakes are allowed. Sorry for my english. Only 3 months of training and manuals :)
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