Precautions During Programming FP08 − 128.4 Operation Errors8.4.4 Points to Check in ProgramCheck if an extraordinarily large value or negative value was stored in the index register.Example: When a data register is modified using an index registerR0F0 MV, DT0, IXDT0In this case, index register (IX) modifies the address of dataregister DT0. If data in IX is larger than the last address of thedata register, an operation error will occur. If the PLC you areusing is of the FP0 16-point type, the last address of the dataregister is DT1659. If the data in IX exceeds the range of K0 toK255, an operation error will occur. The same is true when thecontents of IX are negative.Is there any data which cannot be converted using BCD ↔ BIN data conversion?Example: When BCD−to−BIN conversion is attemptedR0F81 BIN, DT0, DT100In this case, if DT0 contains a hexadecimal number with one ofthe digits A through F such as 12A4, conversion will beimpossible and an operation error will result.Example: When BIN−to−BCD conversion is attemptedR0F80 BCD, DT1, DT101In this case, if DT1 contains a negative value or a valuegreater than K9999, an operation error will occur.Check if the divisor of a division instruction is K0.Example:R0F32 %, DT0, DT100, DT200In this case, if the content of DT100 is K0, an operation errorwill occur.
