5 Troubleshooting
5-6
NJ-series CPU Unit Hardware User’s Manual (W500)
Operation in the Function Module Where an Error Event Occurred
I/O Operation for Major Fault Level Controller Errors
The following table gives the operation of the CPU Unit and the I/O devices for the following errors.
• Unsupported Unit Detected
• I/O Bus Check Error
• End Cover Missing
• Incorrect Unit/Expansion Rack Connection
• Duplicate Unit Number
• Too Many I/O Points
• I/O Setting Check Error
Function module
Event level
Major fault level Partial fault level Minor fault level Observation
PLC Function
Module
User program execu-
tion stops.
--- Operation continues.
Motion Control
Function Module
--- All axes stop. (The stop
method depends on the
error.)
• The affected
axis/axes group
stops. (The stop
method depends on
the settings.)
• The motion control
instructions that are
related to axis opera-
tion are not executed.
• Axis operation con-
tinues.
• The motion control
instructions that are
not related to axis
operation are not
executed.
EtherCAT Master
Function Module
--- EtherCAT communica-
tions stop. (The slaves
operate according to
the settings in the
slaves.)
I/O refreshing for Ether-
CAT communications
stops or continues
according to the fail-
soft operation settings
in the master. (If I/O
refreshing stops, the
slaves operate accord-
ing to the settings in the
slaves.)
I/O refreshing for Ether-
CAT communications
continues.
EtherNet/IP
Function Module
--- EtherNet/IP communi-
cations stop. (A soft-
ware connection from
the Sysmac Studio or
an HMI is not possible.)
Part of EtherNet/IP
communications stop.
(A software connection
from the Sysmac Studio
or an HMI is possible if
the communications
connection is not the
cause of the error.)
EtherNet/IP communi-
cations continue.
Unit CPU Unit operation Unit or slave operation
EtherCAT Slave Terminal The EtherCAT Slave Terminal
moves to Safe-Operational state.
Depends on the NX Unit settings.
EtherCAT slave
*1
The slave is placed in the Safe-
Operational state.
Depends on the slave settings.
*2
Servo Drive or NX Unit assigned to
an axis
Updating the command values is
stopped.
All axes stop immediately.
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