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
F2R
When the positive transition instruction turns ON, the F2R instruction will be executed. When the F2R instruction is executed, the result of the F2R conversion of Data_A is stored in D1.
When using a normally open instruction, the F2R instruction is always executed as long as the normally open instruction variable remains ON.
F2RP
The F2RP and F2R instructions have different ways of detecting when to execute. In the F2RP instruction, only the upward transition is detected and the F2RP instruction is executed even when using a normally open instruction. Even if the normally open instruction variable remains ON, the F2RP instruction is executed only once (for 1 scan).