10 CPU Unit Functions
10-38
CJ2 CPU Unit Software User’s Manual
z Restarting and Initializing Special I/O Units
With Special I/O Units, changes to initial settings for allocated DM Area words for the CPU Unit can
be enabled by turning ON the following restart bits without turning OFF the PLC. Normally, this oper-
ation is performed with the user program.
Auxiliary Area Flags and Words
z Special I/O Unit Errors
The following table gives error information related to Special I/O Units.
Auxiliary Area Flags and Words
10-4-3 Special I/O Unit Flags/Bits
Name Address Description
Special I/O Unit Restart Bits A502.00 to
A507.15
Bits A502.00 to A507.15 correspond to Special I/O Units
0 to 95. Turn ON a bit to restart the corresponding Unit.
Special I/O Unit Initialization Flags A330.00 to
A335.15
These flags correspond to Special I/O Units 0 to 95. A
flag will be ON while the corresponding Unit is initializing
after the power is turned ON or the Unit's Restart Bit
(A502.00 to A507.15) is turned ON. Bits A330.00 to
A335.15 correspond to unit numbers 0 to 95.
Name Address Description
Special I/O Unit Number Duplica-
tion Flags
A411.00 to
A416.15
The Duplication Error Flag (A401.13) and the corre-
sponding flag in A411 through A416 will be turned ON
when a Special I/O Unit's unit number has been dupli-
cated. Bits A411.00 to A416.15 correspond to unit num-
bers 0 to 95.
Special I/O Unit Setting Error Flag
(non-fatal error)
A402.02 ON when an installed Special I/O Unit does not match the
Special I/O Unit registered in the I/O table.
Special I/O Unit Setting Error, Unit
Number Flags
A428.00 to
A433.15
When a Special I/O Unit Setting Error occurs, A402.02
and the corresponding flag in these words are turned ON.
Bits A428.00 to A433.15 correspond to unit numbers 0 to
95.
Special I/O Unit Error Flag
(non-fatal error)
A402.06 ON when an error occurs in a data exchange between
the CPU Unit and a Special I/O Unit (including an error in
the Special I/O Unit itself).
Special I/O Unit Error, Unit Num-
ber Flags
A418.00 to
A423.15
When an error occurs in a data exchange between the
CPU Unit and a Special I/O Unit, the Special I/O Unit
Error Flag (A402.06) and the corresponding flag in these
words are turned ON.
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