Appendices
A-104
CJ2 CPU Unit Hardware User’s Manual
• The table of 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.
• If the IOM Hold Bit hasn't been turned ON to protect I/O memory, all nonretained areas of I/O memory
will be cleared when a fatal error other than FALS(007) occurs.
• If the IOM Hold Bit is ON, the contents of I/O memory will be retained but all outputs will be turned OFF.
*1 A404.00 to A404.07 contain the error slot number (00 to 09) in binary. “0F hex” indicates that the slot cannot be deter-
mined.
“0B hex” indicates a bus error occurred for the built-in EtherNet/IP port.
“0E hex” indicates the End Cover is not connected to the CPU Rack or an Expansion Rack.
*2 The maximum processing time for an interrupt task will not be stored in A440 if High-speed interrupt function is enabled in
the PLC Setup.
Table of Fatal Errors
Error
Error
code (in
A400)
Error flag
(Auxiliary
Area)
Flag and
word data
Probable cause Possible remedy
Cycle Time
Exceeded
Error
0x809F A401.08: Cycle
Time Exceeded
Flag
--- The cycle time has exceeded the
maximum cycle time (watch cycle
time) set in the PLC Setup.
Change the program to reduce the cycle time or
change the maximum cycle time setting. Check the
Maximum Interrupt Task Processing Time in A440
and see if the Cycle Time Watch Time can be
changed.
*2
The cycle time can be reduced by divid-
ing unused parts of the program into tasks, jumping
unused instructions in tasks, and disabling cyclic
refreshing of Special I/O Units that don't require fre-
quent refreshing.
I/O Bus Error 0x80C0 to
0x80C7,
0x80CE,
or 0x80CF
A401.14: I/O
Bus Error Flag
A404: I/O Bus
Error Slot and
Rack Num-
bers
Error has occurred in the bus line
between the CPU and I/O Units or
the End Cover is not connected to the
CPU Rack or an Expansion Rack.
*1
A404.08 to A404.15 contain the error
rack number (00 to 03) in binary. 0F
hex indicates that the rack cannot be
determined.0E hex indicates the End
Cover is not connected to the CPU
Rack or an Expansion Rack.
Try turning the power OFF and ON again. If the error
isn't corrected, turn the power OFF and check cable
connections between the I/O Units and Racks and
the End Covers. Check for damage to the cable or
Units. Turn the Rack's power supply OFF and then
ON again.
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