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6 Troubleshooting
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
6-2 Troubleshooting
6
6-2-1 Checking to See If the CPU Unit Is Operating
6-2 Troubleshooting
This section provides basic error identification and troubleshooting flowcharts for errors that can occur
in the NX1P2 CPU Unit. This section also describes hardware errors that are related to the PLC Func-
tion Module, NX bus errors that are related to the NX Bus Function Module, and corrections for these
errors.
When an error occurs in the NX1P2 CPU Unit, use the following flowchart to determine whether the
error is a fatal error or a non-fatal error.
If a communications connection from the Sysmac Studio is not possible, perform the troubleshooting
procedure that is provided in the NJ/NX-series Troubleshooting Manual (Cat. No. W503) before you
assume that the error is a fatal error.
6-2-1 Checking to See If the CPU Unit Is Operating
A
RUN indicator (green)?
Flashing
(2-s intervals)
for 30 s or longer
System Initialization Error
Flashing (at 2-s intervals
or 0.5-s intervals)
Error occurs.
POWER indicator (green)?
ERROR indicator (red)?
Not possible.
Not possible.
RUN indicator (green)?
Not lit.
Lit.
Lit.
Not lit.
Not lit.
Power Supply Error
Hardware Initialization Error
CPU Unit Error
Possible.
Possible.
A fatal error occurred in the CPU Unit.
Refer to the NJ/NX-series Trouble-
shooting Manual (Cat. No. W503) for
the correction.
Communications
with Sysmac
Studio?
Communications
with Sysmac
Studio?
Flashing.
Not lit.
A non-fatal error occurred. Refer to 6-2-2 Troubleshoot-
ing Flowchart for Non-fatal Errors.
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