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
SAR
When the variable of the positive transition instruction turns ON, the SAR instruction is run. When the SAR instruction is executed, the result of 1 bit shifted to the right is stored in D1. The most significant bit is not shifted but is also copied to D1. For every bit that shifts, the most significant bit is copied to the topmost empty bit.
When using a normally open instruction, the SAR instruction is always executed as long as the normally open bit is ON.
SARP
The SARP and SAR instructions have different ways of detecting when to execute. In the SARP instruction, even when using a normally open instruction, the SARP instruction is executed only when a positive transition is detected. Even if the bit of the normally open instruction remains ON, the SARP instruction is executed only for one scan.