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Troubleshooting Procedures Section 8-4
Clock Not being Automatically Adjusted
START
N
Y
Is the SNTP error
status bit ON?
Is the ERH indicator
flashing?
Y
N
Y
N
N
Is the HOST indicator
lit?
Is 03C6 stored in
the Ethernet Unit's
error log?
Y
N
The automatic clock adjustment function cannot be used
because no IP address or host name is set for the SNTP
server.
Using the CX-Programmer, make the SNTP settings in the
System Setup. If the host name is used for the server settings,
then the DNS tab settings must be made too.
Is the HOST indicator
flashing?
Y
There is a mistake in the Unit Setup. Correct the mistake.
• The SNTP server address is wrong (set to 255.255.255.255
or 127.*.*.*).
• The SNTP server host name is wrong.
Referring to the error log, correct the communications path.
• The SNTP server address is wrong.
• The IP router table is wrong.
• There is a communications error or a mistake in the
communications path settings.
Clock information cannot be changed because a bus error
occurred between the PLC and the Ethernet Unit.
Turn OFF the power and restart the PLC.
If the problem occurs again, replace the PLC, Backplane, or
Ethernet Unit.
END
Is the SNTP error
status bit ON?
N
Y
For some CPU Unit models and lots, there are operation
modes in which clock information cannot be changed.
For the following model and lot numbers, clock information
cannot be changed while using RUN Mode or Monitor Mode
in asynchronous mode.
• CS1G/H-CPU@@H (Lot Nos.: 030430 and earlier)
• CJ1H/G-CPU@@H (All lots)
