A-99
Appendices
CJ2 CPU Unit Hardware User’s Manual
A-3 Fatal and Non-fatal Error Details
App
A-3-2 Non-fatal Errors
• The table of non-fatal errors is arranged in ascending order of error codes.
• When two or more errors occur at the same time, the error code of the more serious error will be
recorded in A400.
• When the IOM Hold Bit is set to ON, I/O memory will be retained and outputs to the Output Unit will
turn OFF.
Table of Non-fatal Errors
Error
Error code
(in A400)
Error flag
(Auxiliary
Area)
Flag and word
data
Probable cause Possible remedy
Duplicated
Refreshing
Error (CJ1:
Interrupt task
error)
0x008B A402.13: Dupli-
cated Refresh
Error Flag
A426: Unit
number where
duplicated
refresh error
occurred
ON when the Detect Duplicated Refresh Errors
setting in the PLC Setup is set to Detect and one
of the following occurs for the same Special I/O
Unit.
• IORF(097), FIORF(225), IORD(222) or
IOWR(223) in a cyclic task are competing with
FIORF(225), IORF(097), IORD(222) or
IOWR(223) in an interrupt task.
• IORF(097), FIORF(225), IORD(222) or
IOWR(223) was executed in an interrupt task
when I/O was being refreshed.
*1
Check the program. Either disable
detection of duplicated refresh
errors in the PLC Setup or correct
the problem in the program.
Density IO
Error
0x009A A402.12: CJ-
series Basic I/O
Unit Error Flag
A408: Basic I/O
Unit Error, Slot
Number
An error has occurred in a Basic I/O Unit.
*2
Check the Basic I/O Unit to see
whether a fuse needs to be
replaced.
PLC Setup
Error
0x009B A402.10: PLC
Setup Error
Flag
--- There is a setting error in the PLC Setup. The
location of the error is written to A406.
Change the indicated setting to a
valid setting.
Backup Mem-
ory Error
0x00F1 A315.15:
Backup Mem-
ory Error Flag
--- Writing to the built-in flash memory failed. Operation may not be possible
the next time power is restored
after a power interruption.
Replace the CPU Unit.
Tag Memory
Error
0x00F2 A315.12: Tag
Memory Error
Flag
--- An error occurred in memory where network
tags are stored.
Operation may not be possible
the next time power is restored
after a power interruption.
Replace the CPU Unit.
Other Non-fatal
Error (system
work error)
0x00F3 A402.00: Other
Non-fatal Error
(System Work
Error) Flag
--- A non-fatal error other than the non-fatal errors
allocated in A402.01 to A402.15 occurred (such
as an online editing memory error). The details
are stored in A315.
Operation may not be possible
the next time power is restored
after a power interruption.
Replace the CPU Unit.
Battery Error 0x00F7 A402.04: Bat-
tery Error Flag
--- This error occurs when the PLC Setup has been
set to detect battery errors and the CPU Unit's
backup battery is missing or its voltage has
dropped.
Check battery and replace if nec-
essary. Change the PLC Setup
setting if battery-free operation is
being used.
CPU Bus Unit
Error
0x0200 to
0x020F
A402.07: CPU
Bus Unit Error
Flag
A417: CPU Bus
Unit Error, Unit
Number Flags
An error occurred in a data exchange between
the CPU Unit and a CPU Bus Unit.
*3
Check the Unit indicated in A417.
Refer to the Unit's operation man-
ual to find and correct the cause
of the error. Restart the Unit by
toggling its Restart Bit or turn the
power OFF and ON again.
Replace the Unit if it won't restart.
Special IO Unit
Error
0x0300 to
0x035F or
0x03FF
A402.06: Spe-
cial I/O Unit
Error Flag
A418 to A423:
Special I/O Unit
Error, Unit
Number Flags
An error occurred in a data exchange between
the CPU Unit and a Special I/O Unit.
*4
Check the Unit indicated in A418
to A423. Refer to the Unit's opera-
tion manual to find and correct the
cause of the error. Restart the
Unit by toggling its Restart Bit or
turn the power OFF and ON
again. Replace the Unit if it won't
restart.
CPU Bus Unit
Setup Error
0x0400 to
0x040F
A402.03: CPU
Bus Unit Set-
ting Error Flag
A427: CPU Bus
Unit Setting
Error, Unit
Number Flags
An installed CPU Bus Unit does not match the
CPU Bus Unit registered in the I/O tables.
*5
Change the registered I/O table.
Special IO Unit
Setup Error
0x0500 to
0x055F
A402.02: Spe-
cial I/O Unit
Setting Error
Flag
A428 to A433:
Special I/O Unit
Setting Error,
Unit Number
Flags
An installed Special I/O Unit does not match the
Special I/O Unit registered in the I/O tables.
*6
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