Precautions During Programming FP08 − 108.4 Operation Errors8.4 Operation Errors8.4.1 Outline of Operation ErrorsAn operation error is a condition in which operation is impossible when a high-levelinstruction is executed.When an operation error occurs, the ERROR/ALARM LED on the FP0 control unit willblink and the operation error flags (R9007 and R9008) will turn on.The operation error code “E45” is set at special data register DT9000.The error address is stored in special data registers DT9017 and DT9018.Types of Operation ErrorAddress errorThe memory address (number) specified by index modification is outside the area whichcan be usedBCD data errorOperation is attempted on non−BCD data when an instruction handling BCD isexecuted, or BCD conversion is attempted on data which is not within the possibleconversion range.Parameter errorIn an instruction requiring the specification of control data, the specified data is outsidethe possible range.Over area errorThe data manipulated by a block instruction exceeds the memory range.8.4.2 Operation Mode When an Operation Error OccursNormally, the operation stops when an operation error occurs.However, when you set system register 26 to “continuation” (KI), the FP0 control unitoperates even if an operation error occurs.
