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
BCD
Converts a constant to binary coded decimal and stores it in the result data.
When the positive transition instruction turns ON, the BCD instruction will be executed. When the BCD instruction is executed, 10 (1010 in binary) is converted to a binary coded decimal and the binary code 0001 0000 is stored in D1. When using a normally open instruction, the BCD instruction is always executed as long as the normally open instruction variable remains ON.
BCDP
The BCDP and BCD instructions have different ways of detecting when to execute. In the BCDP instruction, only the upward transition is detected and the BCDP instruction is executed even when using a normally open instruction. Even if the normally open instruction variable remains ON, the BCDP instruction is executed only for one scan.
For example BCD conversion of S1 (Data_A) = "99999999" to D1 (Data_B).
