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
ROR
When the positive transition instruction turns ON, the ROR instruction is executed. When the ROR instruction is executed, the result of rotating 1 bit to the right is stored in D1.
When using a normally open instruction, the ROR instruction is always executed as long as the normally open bit is ON.
RORP
The RORP and ROR instructions have different ways of detecting when to execute. In the RORP instruction, even when using a normally open instruction, only the upward transition of the bit is detected, and the RORP instruction is executed. Even if the bit of the normally open instruction remains ON, the RORP instruction is executed only for one scan.