Appendices
A-136
CJ2 CPU Unit Software User’s Manual
A401 A401.13 Duplication Error
Flag
(Fatal error)
ON in the following cases:
• Two CPU Bus Units have been assigned the same unit number.
• Two Special I/O Units have been assigned the same unit num-
ber.
• Two Basic I/O Units have been allocated the same data area
words.
CPU Unit operation will stop and the ERR/ALM indicator on the
front of the CPU Unit will light.
The duplicated unit number is indicated in A409 to A416.
ON: Duplication error
OFF: No duplication
This flag will be turned OFF when the error is cleared.
Cleared Cleared A410 to A416
A401.14 I/O Bus Error
Flag
(Fatal error)
ON when an error occurs in a data transfer between the CPU Unit
and a Unit mounted to a slot or when the End Cover is not con-
nected to the CPU Rack or an Expansion Rack.
CPU Unit operation will stop and the ERR/ALM indicator on the
front of the CPU Unit will light.
ON: Error
OFF: No error
This flag will be turned OFF when the error is cleared.
The slot number (00 to 09) where the I/O bus error occurred is
written to A404.00 to A404.07 in binary. If an End Cover is not
connected, 0E hex will be stored.
The rack number (00 to 07) where the I/O bus error occurred is
written to A404.08 to A404.15 in binary. These bits will contain 0B
hex if an I/O bus error occurs on a CJ2HCPU6@-EIP or CJ2M-
CPU3@ built-in network. If an End Cover is not connected, 0E hex
will be stored.
Cleared Cleared A404
A401.15 Memory Error
Flag
(Fatal error)
ON when an error occurred in memory or there was an error in
automatic transfer from the Memory Card when the power was
turned ON.
CPU Unit operation will stop and the ERR/ALM indicator on the
front of the CPU Unit will light.
ON: Error
OFF: No error
The location where the error occurred is indicated in A403.00 to
A403.08, and A403.09 will be turned ON if there was an error dur-
ing automatic transfer at startup.
This flag will be turned OFF when the error is cleared. The auto-
matic transfer at startup error cannot be cleared without turning
OFF the PLC.
Cleared Cleared A403
Address
Name Function
Status
after mode
change
Status at
startup
Write timing/
Related flags, set-
tings
Words Bits
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