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Automatic Clock Adjustment Switch Section 5-3
5-3 Automatic Clock Adjustment Switch
The Automatic Clock Adjustment Switch is allocated in the CIO Area as
shown below. The first word n of the CIO Area is calculated using the follow-
ing equation.
n = CIO 1500 + (25
× unit number)
Automatic Clock
Adjustment Switch
(Bit 04 of n)
The Unit control bit is shown in the following diagram.
When the Automatic Clock Adjustment Switch turns from OFF to ON, the
Ethernet Unit obtains the clock data from the SNTP server on the network,
and applies it to the local CPU Unit. After applying the data, the switch auto-
matically turns OFF again.
5-4 Automatic Clock Adjustment Error Processing
5-4-1 Automatic Clock Adjustment (SNTP) Errors
The following table shows the main causes and remedies for errors that occur
in the automatic clock adjustment function (SNTP).
5-4-2 Troubleshooting Automatic Clock Adjustment Errors with
Indicators
15 14 13 12 11 10 09 08 07 06 05 04 03 02 01 00
n
Automatic Clock
Adjustment Switch
Cause Correction
SNTP, DNS server address not set Reset each server address (IP address or
host name).
SNTP, DNS server communications time-
out
Inspect the communications path (Ether-
net Unit, cable connections, hub, router,
server), and correct the situation that is
causing the error.
CPU Unit internal clock could not be set The automatic clock adjustment function
is not supported by certain CPU Units
(models, lot numbers) if they are in RUN
or MONITOR mode.
RUN ERC ERH LNK HOST Probable cause Correction
ON --- ON --- Flash-
ing
The server (DNS,
SNTP) settings in
the Unit Setup are
incorrect.
Read the error status
and error log, and
reset the data in
which the error
occurred. If the error
occurs again,
replace the CPU
Unit.
OFF --- Flash-
ing
A Network failure
has occurred in the
communications
path, causing an
access timeout.
Inspect the commu-
nications path
(Ethernet Unit, cable
connections, hub,
router, server), and
correct the situation
that is causing the
error.