Arithmetic instructions
445
Part III FP Instructions
For Relay T/C Register Constant
s1, s2, s3 DWX DWY DWR DWL DSV DEV DDT DLD DFL dec. or hex.
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, s2, and s3 are
not REAL numbers.
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.
Operands
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 constant -1.23 is assigned to input s1 (negative offset) and the constant 5.55 is assigned to
input s2 (positive offset). 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 is negative (-10.0), the negative offset -1.23 is added to it.
The result here is: output_value = -11.23.
LD
To Next Page
Loading...
