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10-4-2 CPU Bus Unit Flags/Bits
Restarting and Initializing CPU Bus Units
With CPU Bus 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 opera-
tion is performed from the user program.
Auxiliary Area Flags and Words
Name
CPU Bus Unit Restart Bits
CPU Bus Unit Initialization Flags
CPU Bus Unit Errors
The following table gives error information related to CPU Bus Units.
Auxiliary Area Flags and Words
Name
CPU Bus Unit Number Duplication
Flags
CPU Bus Unit Setting Error Flag
(Non-fatal error)
CPU Bus Unit Setting Error, Unit
Number Flags
CPU Bus Unit Error Flag
(Non-fatal error)
CPU Bus Unit Error, Unit Number
Flags
CJ2 CPU Unit Software User's Manual
Address
A501.00 to
These bits correspond to CPU Bus Units 00 to 15 (unit
A501.15
numbers 0 to F). Turn ON a bit to restart the correspond-
ing Unit.
A302.00 to
These flags correspond to CPU Bus Units 00 to 15 (unit
A302.15
numbers 0 to F). A flag will be ON while the correspond-
ing Unit is initializing after the power is turned ON or the
Unit's Restart Bit (in A501.00 to A501.15) is turned ON.
Address
A410.00 to
The Duplication Error Flag (A401.13) and the corre-
A410.15
sponding flag in A410 will be turned ON when a CPU Bus
Unit's unit number has been duplicated.
Bits 00 to 15 correspond to unit numbers 0 to F.
A402.03
ON when an installed CPU Bus Unit does not match the
CPU Bus Unit registered in the I/O table.
A427.00 to
When a CPU Bus Unit Setting Error occurs, A402.03 and
A427.15
the corresponding flag in A427 are turned ON.
Bits 00 to 15 correspond to unit numbers 0 to F.
A402.07
ON when an error occurs in a data exchange between
the CPU Unit and a CPU Bus Unit (including an error in
the CPU Bus Unit itself).
A417.00 to
When an error occurs in a data exchange between the
A417.15
CPU Unit and a CPU Bus Unit, the CPU Bus Unit Error
Flag (A402.07) and the corresponding flag in A417 are
turned ON.
Bits 00 to 15 correspond to unit numbers 0 to F.
10 CPU Unit Functions
Description
Description
10
10-37
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