2-13
2 Error Troubleshooting Methods
NJ-series Troubleshooting Manual (W503)
2-3 Troubleshooting Non-fatal Errors
2
2-3-4 Checking for Errors with System-defined Variables
The system-defined variables include an Error Status variable, which shows the error status. The fol-
lowing diagram shows the structure of this variable. The system determines the error status of each
level by logically ORing the error status information of the next lower level. You can read the Error Sta-
tus variable from an external device through communications. Refer to the NJ-series CPU Unit Soft-
ware User’s Manual (Cat. No. W501) for information on system-defined variables.
2-3-4 Checking for Errors with System-defined Variables
_ErrSta
_PLC_ErrSta
_CJB_ErrSta
_CJB_UnitErrSta
Level 1
Level 2 Level 3 Level 4
Error status variable for PLC Function Module
Error Status variable (for the entire Controller)
Error status variable for I/O bus
Error status variable for master
Error status variable for Units
Error status variable for Motion Control Function Module
Common error status variable
Axis error status variable
Axes group error status variable
_MC_ErrSta
_MC_ComErrSta
_MC_AX_ErrSta
_MC_GRP_ErrSta
_CJB_MstrErrSta
_EIP_ErrSta
_EIP_PortErr
_EIP_CipErr
_EIP_TcpAppErr
Error status variable for EtherNet/IP Function Module
Error status variable for communications ports
Error status variable for CIP communications
Error status variable of the TCP application function
_EC_ErrSta
_EC_PortErr
_EC_MstrErr
_EC_SlavErr
_EC_SlavErrTbl
Error status variable for EtherCAT Master Function Module
Error status variable for communications ports
Error status variable for master
Summary error status variable for all slaves
Error status variable for slaves
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