Meanings of Error Status Bits
The meanings of the individual bits in the following error status are the same.
• _ErrSta
(Controller Error Status)
• _PLC_ErrSta (PLC Function Module Error Status)
• _CJB_ErrSta (I/O Bus Error Status)
• _CJB_MstrErrSta (I/O Bus Master Error Status)
• _CJB_UnitErrSta (I/O Bus Unit Error Status)
• _NXB_ErrSta (NX Bus Function Module Error Status)
• _NXB_MstrErrSta (NX Bus Function Module Master Error Status)
• _NXB_UnitErrStaTbl (NX Bus Function Module Unit Error Status)
• _MC_ErrSta (MC Error Status)
• _MC_ComErrSta (MC Common Error Status)
• _MC_AX_ErrSta (Axis Error Status)
• _MC_GRP_ErrSta (Axes Group Error Status)
• _EC_ErrSta (Built-in EtherCAT Error)
• _EC_PortErr (Communications Port Error)
• _EC_MstrErr (Master Error)
• _EC_SlavErr (Slave Error)
• _EC_SlavErrTbl (Slave Error Table)
• _EIP_ErrSta (Built-in EtherNet/IP Error)
• _EIP_PortErr (Communications Port Error), _EIP1_PortErr (Communications Port1 Error),
_EIP2_PortErr (Communications Port2 Error)
• _EIP_CipErr (CIP Communications Error), _EIP1_CipErr (CIP Communications1 Error),
_EIP2_CipErr (CIP Communications2 Error)
• _EIP_TcpAppErr (TCP Application Communications Error)
The meanings of the bits are shown in the following table. However, do not use the following varia-
bles in the user program: _ErrSta (Controller Error Status), _CJB_ErrSta (I/O Bus Error Status),
_CJB_MstrErrSta (I/O Bus Master Error Status), _CJB_UnitErrSta (I/O Bus Master Unit Status),
_NXB_ErrSta (NX Bus Function Module Error Status), _NXB_MstrErrSta (NX Bus Function Module
Master Error Status), and _NXB_UnitErrStaTbl (NX Bus Function Module Unit Error Status). There
may be a delay in updating them and concurrency problems in relation to the error status of the
function module. Use these variables only to access status through communications from an exter-
nal device.
Bit: 1 5 1 4 1 3 1 2
-
1
1
--
-
1 0
-
9
-
8
7 6 5 4
-
3
-
1
-
2
WORD
-
0
Bit Meaning
15 Master-detected error: This bit indicates whether the master detected a Controller error in the Unit/slave for
the error status of the Controller error
.
TRUE: The master detected a Controller error.
FALSE: The master has not detected a Controller error. (Valid for _CJB_UnitErrSta.)
14 Collective slave error status: This bit indicates if a Controller error was detected for levels (e.g., a Unit, slave,
axis, or axes group) that are lower than the event source (i.e., for a function module).
TRUE: A Controller error has occurred at a lower level.
F
ALSE: A Controller error has not occurred at a lower level. (Valid for _CJB_ErrSta, _MC_ErrSta, and
_EC_ErrSta.)
8 to 13 Reserved.
3 System-defined Variables Related to the Built-in EtherNet/IP Port
3-21
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
3-2 System-defined Variables
3
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