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s7——300plc爱对方的发达
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S7-300/400 Tip Analog Scaling Tip No. 1
Copyright 1996 by SIEMENS page 1 / 7 Scaling.doc
Status: 11/96 Version 1.0
SIMATIC S7-300/400 customers have free use of the application tips. These tips are only a general approach to using the S7-300/400 with various
applications. Your specific application may be different. It is your responsibility to use the SIMATIC S7-300/400 properly in your applications.
Group Topic
1 Scaling Analog Values
Overview
Analog Inputs and Outputs in an S7 PLC are represented in the PLC as a 16-bit integer. Over
the nominal span of the analog input or output, the value of this integer will range between -
27648 and +27648. However, it is easier to use the analog values if they are scaled to the
same units and ranges as the process being controlled. This applications tip describes
methods for scaling analog values to and from engineering units.
Program Description
The program for scaling analog values consists of 2 function (FC) blocks. These blocks are
optimized for unipolar (0..27648) analog values, but will also work with bipolar analogs. Both
blocks are shown in two different languages: LAD and STL.
FC100 converts an integer in a nominal 0..27648 range to a floating point number in the
specified engineering units.
FC101 converts a floating point number in the specified engineering units to an integer in
0..27648 range.
SIMATIC
S7-300/400 Tips
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