3-19
3 System-defined Variables Related to the Built-in EtherNet/IP Port
NJ/NX-series CPU Unit Built-in EtherNet/IP Port User’s Manual (W506)
3-2 System-defined Variables
3
Meanings of Error Status Bits
Note Bits 14 and 15 are never TRUE for the built-in EtherNet/IP port.
Precautions for Correct UsePrecautions 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.
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. 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.
WORD
15Bit: 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
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