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how to convert and display voltage or temperature?

Created by: khairul at: 7/10/2011 4:14 AM (4 Replies)

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7/10/2011 4:14 AM	Rate (0)
khairul Posts: 57 Rating: (0)	Hi everyone.. i need some help to display the temperature or voltage on my display. in my PLC, i'm using the variable resistor to simulate the temperature or voltage. for example, V=(Int x 0.00036) ; where V is voltage, Int is the value from variable resistor, and 0.00036 is fix value. in my plc, I set the Int = 13888, and i will get 5V. and i want to display the 5V in my display. i need to convert to voltage first and display it. how can i create the voltage formula in PLC? and how can i display the voltage on HMI panel. hopefully, somebody will help me to solve the problem. i also attach my plc programming pictures. sorry, i cant upload the programming because it take too long to upload. thanks.. Attachment Pic.zip (865 Downloads)
khairul Posts: 57 Rating: (0)
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7/10/2011 4:10 PM	Rate (0)
tburov Member Joined: 11/29/2010 Last visit: 9/27/2024 Posts: 4 Rating: (0)	Hi khairul, First, I siggest to take IW64(the value fromADC)and convert it to real. Then multiply it by 0,00036 and store it in MD100 for example. There is your result in voltage. Further connect the tag MD100 in your display in IO field to show voltage on screen. If you want to go from voltage to temperature, please give me the relation between them. Calculation is similar, but you should know how 0-10V or 0-27648 corespond to temperature. Example: 0-10v is 0-27648 and is 0-100 degree Celcius temperature. Then 100/27648 = 0,0036168981481481481481481481481481. If you read IW64 (your result from ADC) 27000, then the tempearature is 27000*0,00361689 = 97,65degrees. So if you have tag connected to IO field in panel you can show temperature also. Hope this will help you.

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7/11/2011 3:28 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 11/4/2024 Posts: 4351 Rating: (1452)	Hi, two tips: 1 - you can use SCALE blcoks to convert analogical values to scaled real value /tf/WW/en/Posts/31698#top 2 - you can use the function linear scalling in the HMI tag definition.
	Denilson Pegaia Siemens Industry Sector Technical Support
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7/12/2011 9:04 AM	Rate (0)
khairul Posts: 57 Rating: (0)	thanks your reply and help..
khairul Posts: 57 Rating: (0)
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7/12/2011 12:07 PM	Rate (0)
Denilson Pegaia Platinum Expert Joined: 9/23/2005 Last visit: 11/4/2024 Posts: 4351 Rating: (1452)	you are wellcome
	Denilson Pegaia Siemens Industry Sector Technical Support
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