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6-4. Hints for Programming High-level Instructions
3. Operation Errors
1) Operation Errors
• An operation error is one of the errors in the programmable controllers. These errors occur when an instcruction
[one of high-level/some basic (e.g., ST =) instructions] is executed abnormally.
• When an operation error occurs, operation of the programmable controller stops. At the same time, operation error
flags R9007 and R9008 turn ON, the error address is stored in DT9017 and DT9018, the error code [K45 (H2D)] is
set at DT9000, and the ERR. LED lights.
Note:
2) Types of Operation Error
3) Status of Programmable Controller When an Operation Error Occurs
• The operation of the programmable controller stops when an operation error occurs. However, when you set system
register 26 to “1” (start), the programmable controller operates even if an operation error occurs.
• Refer to page 230, “8-5. System Registers”, for details about how to change the system register number.
Item
Address error
BCD data error
Parameter error
Over area error
Description
This error occurs when the address modified by the index register exceeds its
last address in the instruction.
This error occurs when the data not represented in BCD is handled as BCD in
the instruction.
This error occurs when the control data is wrongly specified in the instruciton.
This error occurs when a block of registers specified as a source exceeds the last
address of the operands specified as a destination in the high-level instructions.
• FP1s with the error address storage function (the DT9017 and the DT9018 are available) have CPU
version 2.7 or later (all FP1s with the suffix “B” on the part number have this function).
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