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Auxiliary Area Appendix C
A401 A40113 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 number.
• Two Basic I/O Units have been allocated the same
data area words.
CPU Unit operation will stop and the ERR/ALM indi-
cator on the front of the CPU Unit will light.
The duplicated unit number is indicated in A409 to
A416.
1: Duplication error
0: No duplication
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A410 to A416
A40114 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 connected to the CPU Rack or
an Expansion Rack.
CPU Unit operation will stop and the ERR/ALM indi-
cator on the front of the CPU Unit will light.
The slot number (00 to 09) where the I/O Bus Error
occurred is written to A40400 to A40407 in binary
and the rack number (00 to 03) is written to A40408
to A40415 in binary. When the End Cover is not con-
nected to the CPU Rack or an Expansion Rack, 0E
hex will be stored in both locations.
1: Error
0: No error
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A404
A40115 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 indi-
cator on the front of the CPU Unit will light.
1: Error
0: No error
The location where the error occurred is indicated in
A40300 to A40308, and A40309 will be turned ON if
there was an error during automatic transfer at start-
up.
This flag will be turned OFF when the error is
cleared. (The automatic transfer at start-up error can-
not be cleared without turning OFF the PLC.)
Cleared Cleared A403
A402 A40202 Special I/O
Unit Setting
Error Flag
(Non-fatal
error)
ON when an installed Special I/O Unit does not
match the Special I/O Unit registered in the I/O table.
The CPU Unit will continue operating and the ERR/
ALM indicator on the front of the CPU Unit will flash.
1: Error
0: No error
The unit number of the Unit where the setting error
occurred is indicated in A428 to A433.
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A428 to A433
Address Name Function Status
after
mode
change
Status
at star-
tup
Write timing/
Related flags,
settings
Words Bits
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