When the execution result is 0, #L_CalcZero turns on.
When the execution results in an error, the error code is stored in #L_CalcErrCode.
When checking the result using system variables, make sure the check takes place after the instruction has been executed. When checking the state after multiple instructions have been executed, system variables will store the result only of the last processed instruction.
Program Example
ATAN
The ATAN instruction will be executed when the positive transition instruction turns ON. The ATAN instruction calculates the arc tangent of Data_A and stores the result in D1.
When using a normally open instruction, the ATAN instruction is always executed as long as the normally open instruction bit remains ON.
ATANP
ATANP and ATAN instructions differ in when they run. In ATANP instructions, even when using a normally open instruction, the ATANP instruction executes only when it detects the upward transition. Therefore, the ATANP instruction is executed only for one scan, even when the normally open instruction bit remains ON.