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Analog input

Created by: sevek at: 8/16/2012 12:20 AM (6 Replies)

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8/16/2012 12:20 AM	Rate (0)
sevek Posts: 14 Rating: (0)	Hi, I have a problem with the use of analog inputs of S7 300, I must declare these inputs as for example EW256 or PEW 752 ?? thank you very much
sevek Posts: 14 Rating: (0)
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8/16/2012 10:47 AM	Rate (0)
Wizard Diamond Member Joined: 4/24/2006 Last visit: 9/15/2025 Posts: 9027 Rating: (1199)	Hello sevek, When you insert an analog input card in Hardware Configuration. It will get some adresses. These adresses will be outside the Peripherie table. So you should use them as PEW256 Then everytime you use PEW256, the value will be read direct from the card. If you change the adress inside the Peripherie table. You can use EW10 or PEW10. When you use PEW10, it will read direct from the card. When you use EW10, it will use the value from the Peripherie table. (Read on the beginning of the OB1 cycle) My advise would be to use PEW Best regards, Wizard

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8/16/2012 11:59 AM	Rate (0)
Aret Posts: 2348 Rating: (265)	Basically that depends on address but analog inputs are allocated outside process image by default so you should use PIW...
Aret Posts: 2348 Rating: (265)
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8/16/2012 12:02 PM	Rate (1)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	sevek Hi, I have a problem with the use of analog inputs of S7 300, I must declare these inputs as for example EW256 or PEW 752 ?? thank you very much And as an addition, when using EW, the address should be inside the process image of the CPU. Please see this FAQ:Where and when do you need peripheral addressing?
	Ayman Elotaify
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This contribution was helpful to 1 thankful Users sevek

8/18/2012 11:57 PM	Rate (0)
sevek Posts: 14 Rating: (0)	But when I declare an input as PEW in the symbol table, in OB1 when I use this input on FC105 I have the following error'' the data type IN wrong with the entry in the symbol table of the actual side''
sevek Posts: 14 Rating: (0)
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8/19/2012 8:51 AM	Rate (0)
Ayman Elotaify Platinum Expert Joined: 5/28/2008 Last visit: 9/3/2025 Posts: 4522 Rating: (843)	sevek But when I declare an input as PEW in the symbol table, in OB1 when I use this input on FC105 I have the following error'' the data type IN wrong with the entry in the symbol table of the actual side'' Open Symbol table and create a new raw with your analog input address and define data type as INT. Then go to your FC and type the analog address in input "IN" of FC105. For more info: How and for which analog measurements can you use the function FC105 "SCALE" to convert the integer values (INT) into real number values? Hope this helps.
	Ayman Elotaify
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8/19/2012 11:41 PM	Rate (0)
sevek Posts: 14 Rating: (0)	thank you very much, when I changed the type WORD by INT the problem is resolved.
sevek Posts: 14 Rating: (0)
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