|
ATAN |
  
|
|
ATAN |
|
Block that calculates the arctangent of Value, storing the result in Angle.
Ladder Representation
Block Structure
Variable Type |
Name |
Data Type |
Description |
VAR_INPUT |
EN |
BOOL |
Block enabling |
Value |
REAL |
Value of tangent |
|
VAR_OUTPUT |
Done |
BOOL |
End of operation |
Angle |
REAL |
Value of the angle whose tangent is equal to Value (in radians) |
Operation
When this block has a TRUE value in EN, it sends to the Angle output the arctangent of Value. If no errors, the Done variable is set. If there is any error in the operation, Done is not set, staying in FALSE status, while Angle remains with its value unchanged.
When EN has FALSE value, Angle remains unchanged and Done remains in FALSE.
Block Flowchart
Example in Ladder
The above example calculates the arc, in radians, whose tangent is the VALUE variable, storing the final result in ANGLE. The arc, for positive values, is always in the first quadrant. The block ends with success and Done output is activated.
The above example calculates the arc, in radians, whose tangent is the VALUE variable, storing the final result in ANGLE. The arc, for negative values, is always in the fourth quadrant. The block ends with success and Done output is activated.
Example in ST
The example below displays the instructions for applying the example above in the ST language.
VAR VALUE : REAL := -1.0; ANGLE : REAL; END_VAR
ANGLE := FB_ATAN(EN:=DI1, Value:=VALUE, Done=>DO1);
|
|---|