Panasonic FP Series Programming Manual page 532

can write constants directly at the input contact of the function instead.
Body When the variable start is set to TRUE, the function is carried out.
LD
ST When programming with structured text, enter the following:
IF start THEN
F216_DOR(input_value_1, input_value_2, output_value);
END_IF;
Bitwise Boolean instructions
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