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Totalizer flow via PLC

Created by: Martins_Eng at: 11/11/2011 2:28 AM (8 Replies)

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11/11/2011 2:28 AM	Rate (0)
Martins_Eng Experienced Member Joined: 7/17/2010 Last visit: 2/17/2024 Posts: 184 Rating: (0)	Hi Srs (s). I have a problem to carry a recorder with S7-300, I carry a water measurement with PLC, have to put on the HMI display the instantaneous flow rate and also I have total, total ZAO during the day. Details can not use the meter Development also have to all without using a meter that totals. How do I calculate the PLC totalizer Thanks for your participations

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11/11/2011 4:30 AM	Rate (0)
Indunil Posts: 33 Rating: (2)	Hello, Have you established a communication linkin between withyour instrument and PLC such as Profibus or Eathernet? Or have you planned to read the data via a analog channel?
Indunil Posts: 33 Rating: (2)
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11/11/2011 7:05 AM	Rate (0)
Dustin_Huahen Member Joined: 11/11/2011 Last visit: 1/27/2024 Posts: 7 Rating: (1)	Hello, You can write code inOB35, the interruput organization per 100ms.

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11/11/2011 8:12 AM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/8/2025 Posts: 6858 Rating: (1366)	Martins_Eng How do I calculate the PLC totalizer Dear Martins_Eng, Check this link for a solution in STL. Best regards, Hamid Hosseini
	Demo Channel on Youtube
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11/11/2011 11:27 AM	Rate (0)
Jazz_M Gold Member Joined: 9/6/2008 Last visit: 5/7/2022 Posts: 1121 Rating: (86)	Hi Well please find the attached link for the totaliser block for PLC, If you have MODPID library you will have FB 8 Intergrator block. https://support.automation.siemens.com/WW/llisapi.dll?func=ll&objid=23061633&nodeid0 Havefun....
	Jazz
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11/11/2011 12:20 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/8/2025 Posts: 6858 Rating: (1366)	Note while using FB8 of modular PID control, it limits the output of integrator to a high and low limit(as limits for physical actuator). INTEG: Integrator Application Process variables are integrated dynamically. This means, for example, that the distance traveled is calculated from the speed. The integrator can be used to configure a controller. Functional Description The block integrates the input variable over time and restricts the integral to a selectable upper and lower limit. The limit of the output variable is indicated by signal bits. Best regards, Hamid Hosseini
	Demo Channel on Youtube
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This contribution was helpful to 1 thankful Users Jazz_M

11/12/2011 11:32 AM	Rate (0)
Martins_Eng Experienced Member Joined: 7/17/2010 Last visit: 2/17/2024 Posts: 184 Rating: (0)	Hi Guys Thanks for the tips, I'll measure the flow of a switch, and total flow is going to use an analog 4-20mA How do I include it in the case of OB35, because I know I have to total all the oscillations to measure the flow done and how this function?

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11/12/2011 2:50 PM	Rate (0)
hdhosseini Diamond Expert Joined: 1/28/2009 Last visit: 1/8/2025 Posts: 6858 Rating: (1366)	Martins_Eng Hi Guys Thanks for the tips, I'll measure the flow of a switch, and total flow is going to use an analog 4-20mA How do I include it in the case of OB35, because I know I have to total all the oscillations to measure the flow done and how this function? Dear Martins_Eng, If you have flow transmitter and scaled the physical value to the MD10, as input of totalizer function,So you can implement your totalizer as following: [code]// Called in OB35 CALL "Totalizer" , DB100 VALUE :=MD10 INTERVAL:=T#1M CYCLE :=T#100MS COM_RST :=M20.0 TOTAL :=MD30[/code] TOTAL={{(VALUE)CYCLE}/INTERVAL}+TOTAL In case of this example: TOTAL={{(MD10)0.1}/60.0}+TOTAL Download the codes from here and some extra information here. Best regards, Hamid Hosseini
	Demo Channel on Youtube
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11/18/2011 3:56 PM	Rate (0)
metwally mustafa Silver Member Joined: 10/10/2010 Last visit: 12/5/2024 Posts: 307 Rating: (15)	thank you

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This contribution was helpful to 1 thankful Users hdhosseini

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