Omron CP1H CPU Operation Manual page 618

Troubleshooting
Program Error
8.0. → f.0. →
→ →
Program error details
Seven-segment display
8.0.→f.0.→ →0.1.→0.0.→ Instruction Processing Error
8.0.→f.0.→ →0.2.→0.0.→ Indirect DM Addressing BCD Error
→0.4.→0.0.→ Illegal Area Access Error
→0.8.→0.0.→ No END Error
→1.0.→0.0.→ Task Error
→0.2.→0.0.→ Differentiation Overflow Error
→0.4.→0.0.→ Illegal Instruction Error
→0.8.→0.0.→ UM Overflow Error
584
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.
If the PLC Setup has been set to stop operation for an instruction error, the Error Flag will be
turned ON when an instruction cannot be executed due to a problem in the operand data.
Refer to A298 and A299 (instruction program address when the program fails), check the spec-
ifications for the relevant instruction, and set the correct operand data.
Alternatively, set the PLC Setup to not stop operation for an instruction error.
If the PLC Setup has been set to stop operation for an indirect DM BCD error, the Access Error
Flag will turn ON when the content of an indirectly addressed DM operand is not BCD although
BCD mode has been selected.
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 or set the PLC Setup to not stop
operation for an indirect DM addressing BCD error.
If the PLC Setup has been set to stop operation for an illegal access error, the Access Error
Flag will turn ON when an illegal access error has occurred.
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 correc-
tive actions so that illegal area access errors will not occur.
This error occurs when there is not an END(001) instruction in the program within a task. Insert
an END(001) instruction at the end of the program allocated to the task stored in A294 (task
number when the program fails).
This error is generated by any of the following conditions.
• There is not an executable cyclic task (active). Check the properties of the executable cyclic
task and set at least one task to start when operation starts.
• There is no specified interrupt task when an interrupt is generated (input interrupt, high-speed
counter interrupt, scheduled interrupt, or external interrupt).
Create a task for the number stored in A294 (task number when the program fails).
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.
Execution of an unexecutable instruction was attempted. Check the program, correct the prob-
lem, and transfer the program to the CPU Unit again.
An attempt was made to execute a program that exceeds the user program capacity. Transfer
the program again using the CX-Programmer.
Probable cause and possible remedy
Section 11-2