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Analogue Input

Created by: Fani.Ing at: 7/19/2011 12:38 PM (4 Replies)

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7/19/2011 12:38 PM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Hi I have a stupid question. Hopefully a good technical description will make it clear to me. When you have an Analogue Input (e.g Level, Temperature) how do you know that in the PLC symbol list when you define the variable for the said analogue input the type of this variable will be INT or Real or DINT or DWORD In my application I have some field devices which are giving me an 4-20ma signal. What type of variable should I decleare in the symbol list? Thanks
Fani.Ing Posts: 77 Rating: (3)	Last edited by: Fani.Ing at: 7/19/2011 12:44 PM Last edited by: Fani.Ing at: 7/19/2011 12:44 PM
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7/19/2011 12:49 PM	Rate (1)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 10/17/2024 Posts: 5697 Rating: (715)	A question is never stupid, not asking is The data type should be Word, see picture Regards, Marcjan Attachment symbol.JPG (155 Downloads)
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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7/20/2011 8:04 AM	Rate (0)
Fani.Ing Posts: 77 Rating: (3)	Thanks for your asnwer. Can you please give me some technical reason that why it is WORD not a DWORD?
Fani.Ing Posts: 77 Rating: (3)
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7/20/2011 8:31 AM	Rate (0)
Aret Posts: 2348 Rating: (264)	Simple - ADC resolution is usually under 16 bits - thus DWORD is not needed:^)
Aret Posts: 2348 Rating: (264)
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7/20/2011 10:05 AM	Rate (1)
Marcjan Platinum Expert Joined: 4/22/2010 Last visit: 10/17/2024 Posts: 5697 Rating: (715)	Hello, Here you can read more about this issue : https://www.automation.siemens.com/mcms/sce/en/advanced_training/training_material/download_training_material/b_advanced_functions_step7_programming/Documents/b02_analog.pdf Regards, Marcjan
	Problem solved? Please let us know! Please no technical questions by PM, use the forum sections for your questions.
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