A-35
Appendices
NJ-series CPU Unit Software User’s Manual (W501)
A-3 System-defined Variables
App
A-3-3 PLC Function Module, Category Name: _CJB
Functional Classification: Auxiliary Area Bits for CJ-series Units
Variable name Meaning Function Data type
Range of
values
Reference
_CJB_IOUnitInfo Basic I/O Unit
Information
Shows the status of the Basic I/O Unit alarm
output (load short-circuit protection).
TRUE: Load short-circuit
FALSE: No load short-circuit
ARRAY
[0..3, 0..9,
0..7] OF
BOOL
TRUE or
FALSE
page A-63
_CJB_CBU00InitSta
to
_CJB_CBU15InitSta
CPU Bus Unit Ini-
tializing Flags
The corresponding variable is TRUE during
initialization of the CPU Bus Unit.
The corresponding variable changes to
FALSE when the initialization is completed.
The numbers in the variables indicate the unit
numbers of the applicable Units.
BOOL TRUE or
FALSE
page A-63
_CJB_SIO00InitSta
to
_CJB_SIO95InitSta
Special I/O Unit
Initializing Flags
The corresponding variable is TRUE during
initialization of the Special I/O Unit.
The corresponding variable changes to
FALSE when the initialization is completed.
The numbers in the variables indicate the unit
numbers of the applicable Units.
BOOL TRUE or
FALSE
page A-63
_CJB_CBU00Restart
to
_CJB_CBU15Restart
CPU Bus Unit
Restart Bits
The CPU Bus Unit is restarted when the cor-
responding variable changes to TRUE. (It is
changed to FALSE by the system after the
CPU Bus Unit is restarted.)
The numbers in the variables indicate the unit
numbers of the applicable Units.
If you change the Restart Flag to TRUE with
an instruction, the restart process begins from
refresh processing in the next task period.
BOOL TRUE or
FALSE
page A-63
_CJB_SIO00Restart
to
_CJB_SIO95Restart
Special I/O Unit
Restart Bits
The Special I/O Unit is restarted when the
corresponding variable changes to TRUE. (It
is changed to FALSE by the system after the
Special I/O Unit is restarted.)
The numbers in the variables indicate the unit
numbers of the applicable Units.
If you change the Restart Flag to TRUE with
an instruction, the restart process begins from
refresh processing in the next task period.
BOOL TRUE or
FALSE
page A-64
_CJB_SCU00P1ChgSta
to
_CJB_SCU00P2ChgSta
Serial Communi-
cations Unit 0,
Port 1/2 Settings
Changing Flags
TRUE when the parameters of the specified
port are being changed. TRUE when the
Change Serial Communications Parameter
(SerialSetup) instruction is being executed.
FALSE after the parameters are changed.
It is also possible for the user to indicate a
change in serial port settings by turning ON
the corresponding flag through the execution
of an instruction or a user operation.
BOOL TRUE or
FALSE
page A-64
_CJB_SCU15P1ChgSta
to
_CJB_SCU15P2ChgSta
Serial Communi-
cations Units 1 to
15, Port 1/2 Set-
tings Changing
Flags
BOOL TRUE or
FALSE
page A-64
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