Troubleshooting; Checking To See If The Cpu Unit Is Operating - Omron NX1P2 series User Manual

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.
6-2-1

Checking to See If the CPU Unit Is Operating

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.
Error occurs.
POWER indicator (green)?
Lit.
Flashing.
ERROR indicator (red)?
Lit.
RUN indicator (green)?
Not lit.
Communications
with Sysmac
Studio?
Possible.
A
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
Not lit.
Not lit.
RUN indicator (green)?
Not lit.
Communications
with Sysmac
Studio?
Flashing (at 2-s intervals
Possible.
or 0.5-s intervals)
Not possible.
A non-fatal error occurred. Refer to 6-2-2 Troubleshoot-
ing Flowchart for Non-fatal Errors.
A fatal error occurred in the CPU Unit.
Refer to the NJ/NX-series Trouble-
shooting Manual (Cat. No. W503) for
the correction.
Power Supply Error
Flashing
(2-s intervals)
for 30 s or longer
System Initialization Error
Not possible.
Hardware Initialization Error
CPU Unit Error

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