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