Description
You can use the "Form arctangent value" instruction to calculate the size of the angle from the tangent value specified at input IN, which corresponds to this value. It is only permitted to specify valid floating-point numbers (or -NaN/+NaN) at input IN. The calculated angle size is output in radians at the OUT output and can range in value from -π/2 to +π/2.
The enable output ENO has the signal state "0" if one of the following conditions applies:
-
Enable input EN has the signal state "0".
-
The value at input IN is not a valid floating-point number.
Parameters
The following table shows the parameters of the instruction "Form arctangent value":
|
Parameters |
Declaration |
Data type |
Memory area |
Description |
|
|---|---|---|---|---|---|
|
S7-1200 |
S7-1500 |
||||
|
EN |
Input |
BOOL |
I, Q, M, D, L or constant |
I, Q, M, D, L, T, C or constant |
Enable input |
|
ENO |
Output |
BOOL |
I, Q, M, D, L |
I, Q, M, D, L |
Enable output |
|
IN |
Input |
Floating-point numbers |
I, Q, M, D, L, P or constant |
I, Q, M, D, L, P or constant |
Tangent value |
|
OUT |
Output |
Floating-point numbers |
I, Q, M, D, L, P |
I, Q, M, D, L, P |
Size of the angle in radians |
You can select the data type of the instruction from the "???" drop-down list of the instruction box.
For additional information on valid data types, refer to "See also".
Example
The following example shows how the instruction works:
The following table shows how the instruction works using concrete operand values:
|
Parameters |
Operand |
Value |
|---|---|---|
|
IN |
Tag_Value |
1.0 |
|
OUT |
Tag_Result |
+0.785398 (π/4) |
If the "TagIn" operand has signal state "1", the instruction is executed. The instruction calculates the size of the angle corresponding to the tangent value at input "Tag_Value". The result of the instruction is stored at output "Tag_Result". If the instruction is executed without errors, the "TagOut" output is set.