Panasonic FP Series Programming Manual page 473

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Arithmetic instructions

The function renders the value y at position x by performing a linear interpolation based on the

neighboring reference points Pw(xw, yw) and Pw+1(xw+1, yw+1). In this example, w is the

nearest reference point whose x value is smaller than the input value x, i.e. the function connects

the individual reference points in series and renders the output value y based on the input value s.

This instruction also exists as a P instruction (for FP2/2SH, FP3/5, FP10/10SH PLC types), which

is only executed at the rising edge of the EN trigger. Select [Insert P instruction] from the

"Instructions" pane if you require a P instruction. To facilitate reuse, the instruction then appears

under "Recently used" in the pop-up menu. Press <Ctrl>+<Shift>+<v> within the programming

area to open the list of recently used elements.

The function can be used for:

linearizing measured values, e.g. with non-linear sensors

rendering a heater's flow temperature y in relation to the outside temperature x

Availability of F283_DSCAL (see page 1323)

Linearization of 32-bit data

Input value x

The first element of a DUT-type variable that contains the xy

value pairs.

Output value y

Activation of the function (when EN = TRUE, the function is

executed during each PLC cycle)

ENO is set to TRUE as soon the function is executed.

Helpful when cascading function blocks with EN functions.

dec. or hex.