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Arithmetic instructions
POU header
In the POU header, all input and output variables are declared that are used for programming this
function.
In this example, the input variable input_value is declared. However, you can write a constant (e.g.
16#89 for 89°) directly at the input contact of the function.
Body
When the variable start is set to TRUE, the function is carried out. The input_value was initialized
with the value 16#89 (89°) in the POU header. The result is written to the ARRAY output_value.
Here in the first element of the ARRAY, the output_value = 16# (+ sign). In the second element,
16#57 represents the number before the decimal point, and 16#2899 comes after the decimal point
in the third element.
LD
ST
IF
start
THEN
F302_BTAN(input_value, output_value);
END_IF;
422
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