Scale an integer value

[Bryll 31]

I uploaded a function to scale an analog value in integer format in the download section. It can be used instead of the standard Siemens "Scale" function, but it will give you the possibility to select the range of the input signal.

[Inntele 60]

Hi Bryll, Can the function, developed by you, operate with unlimited integer values like: In= 2536 (for example) In_Min= -32768 In_Max= 32767 Out_Min= 32767 Out_Max = -32768 ?

[Bryll 31]

Sorry for late response, but yes it should work. I made the same function for Mitsubishi and I use it in almost every program I write Edited 30 Sep 2015 by Bryll

[Inntele 60]

Dear Brill, Just want to draw your attention. If to implement the traditional equation Out = Out_Min + [ ( In - In_Min ) * ( Out_Max - Out_Min ) / ( In_Max - In_Min ) ], 'as is' for the scaling purposes, then all residual values are limited in range from -32768 to 32767, otherwise a negative or positive overflow will occur and the result of calculation will be wrong. To prevent the overflow, values of all operands has to be a half-limited... To avoid this effect and to provide that the scaling function would be able to operate with unlimited integers, another arithmetical equation must be used. If you have already took into account this chip, then your code is smooth. Edited 30 Sep 2015 by Inntele