1-15
1 Overview of Errors
NJ-series Troubleshooting Manual (W503)
1-3 Non-fatal Errors
1
1-3-3 Resetting Non-fatal Errors
Always confirm safety at the connected equipment before you reset Controller errors for a CJ-
series Special Unit. When the Controller error is reset, the Unit where the Controller error with an
event level of observation or higher will be restarted. Before you reset all errors, confirm that no
Controller errors with an event level of observation or higher have occurred for the CJ-series
Special Unit. Observation level events do not appear on the Controller Error Tab Page, so it is
possible that you may restart the CJ-series Special Unit without intending to do so. You can
check the status of the _CJB_UnitErrSta[0,0] to _CJB_UnitErrSta[3,9] Error Status variables on
a Watch Tab Page to see if an observation level Controller error has occurred.
Precautions for Correct UsePrecautions for Correct Use
Resetting an error is not the same as eliminating the cause of the error. Always eliminate the
cause of an error before you perform the procedure to reset the error.
* To reset errors from an NS-series PT, connect the PT to the built-in EtherNet/IP port on the CPU Unit.
Error Resetting Methods
Method Operation
Errors that are
reset
Description
Commands from
Sysmac Studio
Resetting Controller
errors
Resetting all errors
for all function mod-
ules
Reset the Controller errors from the Sys-
mac Studio’s Troubleshooting Dialog Box.
Downloading Resetting all errors
for a specific func-
tion module
After the causes of the Controller errors are
removed, all Controller errors in the relevant
function module are reset as a result. Errors
are not reset when you download the Con-
troller Configurations and Setup.
Memory All Clear Resetting all errors
for all function mod-
ules
After the causes of the Controller errors are
removed, all Controller errors in all function
modules are reset as a result.
Controller reset After the causes of the Controller errors are
removed, all Controller errors in all function
modules are reset as a result.
Commands from an
NS-series PT*
Resetting Controller
errors
Reset Controller errors from the Trouble-
shooter of an NS-series PT that is compati-
ble with NJ-series Controllers.
You can reset errors from a PT that is not
directly compatible with the NJ-series Con-
troller or another company’s HMI if you use
the PT/HMI in combination with the reset
error instruction for the function module in
the user program.
Commands from the
user program
Resetting Controller
errors
Resetting errors for
individual function
modules
Execute the reset error instruction for the
function module in the user program.
• For the Motion Control Function Module,
you can reset all errors, errors for a par-
ticular axis, or errors for a particular axes
group.
• For the I/O bus, you can reset all errors or
just the errors for a particular Unit.
Commands from a
host computer
Resetting Controller
errors with CIP mes-
sages
Resetting all errors
for all function mod-
ules
Use a CIP message from a host computer
to reset errors.
Cycling the Control-
ler’s power supply
--- Resets all errors. After the causes of the Controller errors are
removed, all Controller errors in all function
modules are reset as a result.
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