When the execution result is 0, #L_CalcZero turns on.
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
SAL
When the variable of the positive transition instruction turns ON, the SAL instruction is run. When the SAL instruction is executed, the result of the bit shift is stored in D1. The most significant bit is not shifted, and zero is stored in the least significant bit.
When using a normally open instruction, the SHR instruction is always executed as long as the normally open bit is ON.
SALP
The SALP and SAL instructions have different ways of detecting when to execute. In the SALP instruction, even when using a normally open instruction, the SALP instruction is executed only when a positive transition is detected. Even if the bit of the normally open instruction remains ON, the SALP instruction is executed only for one scan.