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Old February 12th, 2014, 09:07 AM   #1

Sake_no_oni is offline
Join Date: Jan 2013
Location: Dnipropetrovsk
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Step 7 output value scaling

Dear All,

I’m using S7-300. I need to scale an output value for a valve open control. I have an I/O field on my SCADA (WinCC v6.0) where an operator inputs value between 0% and 100%, which is the percent of the valve open, 0% for 4 mA and 100% for 20 mA. I’ve tried to use FC105 and FC106, but in both cases I have 0 on the OUT. I’ve also tried to write the formula from these functions’ “help” manually, but the result was same (zero on the “out”). I’d like to know what I am doing wrong.

Thanks in advance and Best Regards!
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Old February 12th, 2014, 09:11 AM   #2
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JRW is offline
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Join Date: Jun 2002
Location: Upstate South Cackalacky
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With your analog output set to 4-20ma (check your module parameters - double click the module in hardware config)
4-20ma= 0-27648
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