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
H2S
When the positive transition instruction turns ON, the H2S instruction will be executed. When the H2S instruction is executed, the result of the H2S conversion of Data_A is stored in D1.
When using a normally open instruction, the H2S instruction is always executed as long as the normally open instruction variable remains ON.
H2SP
The H2SP and H2S instructions have different ways of detecting when to execute. In the H2SP, only the upward transition is detected and the H2SP instruction is executed even when using a normally open instruction. Even if the normally open instruction variable remains ON, the H2SP instruction is executed only once (for 1 scan).