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Auxiliary Area Appendix C
A402 A40203 CPU Bus Unit
Setting Error
Flag
(Non-fatal
error)
ON when an installed CPU Bus Unit does not match
the CPU Bus 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 written to A427.
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A427
A40204 Battery Error
Flag
(Non-fatal
error)
ON if the CPU Unit’s battery is disconnected or its
voltage is low and the Detect Battery Error setting
has been set in the PLC Setup.
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
This flag can be used to control an external warning
light or other indicator to indicate that the battery
needs to be replaced.
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared PLC Setup (Detect Bat-
tery Error)
A40206 Special I/O
Unit Error Flag
(Non-fatal
error)
ON when an error occurs in a data exchange
between the CPU Unit and a Special I/O Unit (includ-
ing an error in the Special I/O Unit itself).
1: Error
0: No error
The CPU Unit will continue operating and the ERR/
ALM indicator on the front of the CPU Unit will flash.
The Special I/O Unit where the error occurred will
stop operating and the unit number of the Unit where
the data exchange error occurred is indicated in
A418 through A423.
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A418 to A423
A40207 CPU Bus Unit
Error Flag
(Non-fatal
error)
ON when an error occurs in a data exchange
between the CPU Unit and an CPU Bus Unit (includ-
ing an error in the CPU Bus Unit itself).
The CPU Unit will continue operating and the ERR/
ALM indicator on the front of the CPU Unit will flash.
The CPU Bus Unit where the error occurred will stop
operating and the unit number of the Unit where the
data exchange error occurred is indicated in A417.
1: Error
0: No error
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A417
A40210 PLC Setup
Error Flag
(Non-fatal
error)
ON when there is a setting error in the PLC Setup.
The CPU Unit will continue operating and the ERR/
ALM indicator on the front of the CPU Unit will flash.
The location of the error will be written to A406.
1: Error
0: No error
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A406
A40212 Basic I/O Unit
Error Flag
(Non-fatal
error)
ON when an error has occurred in a Basic I/O Unit.
The CPU Unit will continue operating and the ERR/
ALM indicator on the front of the CPU Unit will flash.
The location of the error will be written to A408.
1: Error
0: No error
(This flag will be turned OFF when the error is
cleared.)
Cleared Cleared A408
Address Name Function Status
after
mode
change
Status
at star-
tup
Write timing/
Related flags,
settings
Words Bits
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