6 Troubleshooting
6-10
CP1E CPU Unit Hardware User’s Manual(W479)
A program error indicates a problem with the user program. Refer to the error information, check the
program, and correct the mistakes.
Clear the error once the problem has been corrected.
Program Errors
Cause Remedy
Instruction Processing Error
The instruction could not be executed because of
incorrect operand data, and the ER Flag was
turned ON. (Only when the Stop CPU on Instruc-
tion Error parameter in the PLC Setup is set to
Stop.)
• Refer to A298 and A299 (instruction program address
when the program fails), check the specifications for the
relevant instruction, and set the correct operand data.
• Set the PLC Setup to not stop operation for an instruction
error.
Indirect DM Addressing BCD Error
The operand of indirect DM Area addressing in
BCD Mode did not contain a BCD value when the
instruction was executed, and the AER Flag was
turned ON. (Only when the Stop CPU on Instruc-
tion Error parameter in the PLC Setup is set to
Stop.)
• Refer to A298 and A299 (instruction program address
when the program fails), and correctly set the content for
the indirectly addressed DM operand (BCD mode) to BCD
or change the specified destination. Alternatively, change
the indirect addressing to binary mode.
• Set the PLC Setup to not stop operation for an instruction
error.
Illegal Area Access Error
The AER flag is ON because an illegal area was
specified for access when executing the instruc-
tion. (Only when the Stop CPU on Instruction
Error parameter in the PLC Setup is set to Stop.)
The following operations are considered illegal
access:
• Reading/writing the parameter area
• Writing to an area without memory installed
• Writing to a write-protected area
• Indirect DM addressing BCD error
• Refer to A298 and A299 (instruction program address
when the program fails) and take corrective actions so that
illegal area access errors will not occur.
• Set the PLC Setup to not stop operation for an instruction
error.
No END Error
This error occurs when there is not an END
instruction in the program.
Insert an END instruction at the end of the program allocated
to the task stored in A294 (task number when the program
fails).
Task Error
There is no specified interrupt task when an inter-
rupt is generated (input interrupt, high-speed
counter interrupt or scheduled interrupt.)
Create a task for the number stored in A294 (task number
when the program fails).
Differentiation Overflow Error
Differentiation instructions were repeatedly
inserted or deleted using the online editor and the
system restriction was exceeded.
Change the operating mode to PROGRAM mode and then
return to MONITOR mode.
Illegal Instruction Errors
Execution of an unexecutable instruction was
attempted.
Check the program, correct the problem, and transfer the
program to the CPU Unit again.
UM Overflow Error
An attempt was made to execute a program that
exceeds the user program capacity.
Transfer the program again using the CX-Programmer.
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