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Meanings of Error Status Bits
Bit:
15
14
WORD
Bit
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. These bits show Unit errors. They will not change to TRUE for errors in Ether-
Net/IP communications.
TRUE: The master detected a Controller error.
FALSE: The master has not detected a Controller error.
(Valid for _CJB_U_ErrSta.)
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.
FALSE: A Controller error has not occurred at a lower level.
(Valid for _CJB_ErrSta, _MC_ErrSta, and _EC_ErrSta.)
8 to 13
Reserved.
7
This bit indicates whether a major fault level Controller error has occurred.
TRUE: A major fault level Controller error has occurred.
FALSE: A major fault level Controller error has not occurred.
6
This bit indicates whether a partial fault level Controller error has occurred.
TRUE: A partial fault level Controller error has occurred.
FALSE: A partial fault level Controller error has not occurred.
5
This bit indicates whether a minor fault level Controller error has occurred.
TRUE: A minor fault level Controller error has occurred.
FALSE: A minor fault level Controller error has not occurred.
4
This bit indicates whether an observation level Controller error has occurred.
TRUE: An observation level Controller error has occurred.
FALSE: An observation level Controller error has not occurred.
0 to 3
Reserved.
Note Bits 14 and 15 are never TRUE for the built-in EtherNet/IP port.
Precautions for Correct Use
Precautions for Correct Use
Do not use _ErrSta (Controller Error Status), _CJB_ErrSta (I/O Bus Error Status), _CJB_M-
strErrSta (I/O Bus Master Error Status), and _CJB_UnitErrSta (I/O Bus Unit Error Status) in the
user program. There may be a delay in updating them and concurrency problems may occur
with function module error status. Use this variable only to access status through communica-
tions from an external device.
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User's Manual (W506)
3 System-defined Variables Related to the Built-in EtherNet/IP Port
13
12
11
10
9
8
7
6
5
4
3
2
Meaning
1
0
3
3-19
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