When the execution result is 0, #L_CalcZero turns on.
If an overflow results from the rotation instruction, the overflowed bit is stored in #L_CalcCarry.
When the execution results in an error, the error information is stored in #L_Status.
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
RCR
When the variable of the positive transition instruction turns ON, the RCR instruction is run. When the RCR instruction is executed, the result from rotating 1 bit with carry over is stored in D1.
When 1 bit is shifted to the right with carry over, you can use #L_CalcCarry to check the value of the least significant bit before rotation.
When using a normally open instruction, the RCR instruction is always executed as long as the normally open bit is ON.
RCRP
The RCRP and RCR instructions have different ways of detecting when to execute. In the RCRP instruction, Even when using a normally open instruction, the RCRP instruction executes only when it detects the upward transition. Even if the bit of the normally open instruction remains ON, the RCRP instruction is executed only for one scan.