Mitsubishi Electric M800 Series Manual page 129

M800/M80/E80/C80 Series Alarm/Parameter Manual
10 User PLC Alarms (U)
U10 Illegal PLC
Details
Reserved label error (Before executing PLC)
(1) When using the multi-programming method, disabled reserved label exists.
(2) When using the independent program method, reserved labels are duplicated.
Remedy
(1) When using the multi-programming method, delete the reserved label.
(2) When using the independent program method:
- Delete the PC parameter program settings.
- Correct the duplication of reserved labels.
U10 Illegal PLC
Details
Program setting error (Before executing PLC)
(1) When using the multi-programming method, PC parameter setting is not correct.
- PC parameter (program setting) is not set.
- Unstored program name is set.
- The contents of the program name is abnormal.
- More than the maximum number of programs that can be set (120 programs) are set.
(2) When using the independent program method, multiple programs are stored.
(3) When the multi-project is valid, the sum of all projects exceeds the number of the programs which can be
set (120 programs).
Remedy
(1) When using the multi-programming method, check the PC parameter program settings.
- Check the program settings.
- Check the program name stored in the NC.
- Review the program name and rename it if necessary.
e.g. The program name and the M device number in the PLC program are overlapped.
- Set the number to 120 or less.
(2) When using the independent program method:
- Store only one program file.
(3) When the multi-project is valid, set the number of programs that can be set to be less than 120 programs
as the sum of all projects.
U10 Illegal PLC
Details
RET instruction error
(1) RET instruction was not executed at the branch destination of the CALL instruction.
(2) RET instruction was executed without execution of CALL instruction.
Remedy
Check the following matters for the entire sequence program to be executed.
(1) Check if RET instruction is programmed at the end of sub-routine
(2) Check if diverged to the other operation in the middle of sub-routine and RET instruction is not executed.
(3) Check if jumped to the END reservation label (P4005) in the middle of sub- routine.
(4) Check if there is delimiter (FEND instruction) between adjacent program and sub-routine program.
U10 Illegal PLC
Details
Ladder code error (Before executing PLC)
An error was found in data for the sequence program to be executed.
(1) Disabled PLC instruction is used.
(2) Sequence program stored in the built-in ROM is broken.
(3) Sequence program under development (before writing into the built-in ROM) is broken.
Remedy
Transferring, storing and F-ROM writing of the sequence program must be re- executed with the GX Developer
or PLC onboard edit function.
IB-1501279-H
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