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
R2I
When the positive transition instruction turns ON, the R2I instruction will be executed. When the R2I instruction is executed, the result of the R2I conversion of Data_A is stored in D1.
When using a normally open instruction, the R2I instruction is always executed as long as the normally open instruction variable remains ON.
R2IP
The R2IP and R2I instructions have different ways of detecting when to execute. In the R2IP instruction, only the upward transition is detected and the R2IP instruction is executed even when using a normally open instruction. Even if the normally open instruction variable remains ON, the R2IP instruction is executed only once (for 1 scan).