Arithmetic instructions
438
Part III FP Instructions
d - DWY DWR DWL DSV DEV DDT DLD DFL -
No. IEC address Set If
R9007 %MX0.900.7 permanently
R9008 %MX0.900.8 for an instant
the values at inputs s1_Min, s2_Max,
and s3_In are not REAL numbers or the
value at s1_Min > s2_Max.
R900B %MX0.900.11 to TRUE the result is 0.
R9009 %MX0.900.9 for an instant the result causes an overflow.
In this example, the input variable input_value is declared. However, you can write a constant
directly at the input contact of the function instead.
Error flags
Example
In this example, the same POU header is used for all programming languages. For an example
using IL (instruction list), please refer to the online help.
POU header
All input and output variables used for programming this function have been declared in the POU
header.
Body
The constants 3.0 and 10.0 are assigned to the inputs s1_Min (lower limit of the deadband) and
s2_Max (upper limit of the deadband). However, you can declare two variables in the POU header
and write them in the function in the body at the inputs. When the variable start is set to TRUE, the
function is carried out. Since the input_value = 12.0 is larger than the value of the upper limit of
the deadband at s2_Max, the output_value = 12.0 -10.0 = 2.0.
LD
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