
Overview | Section |
5-1 Overview
5-1-1 Overview
The Ethernet Unit can obtain the clock information from the SNTP server (see note 1) at a particular time or when a designated bit turns ON and then refresh the internal clock information of the CPU Unit to which it is mounted (referred to as the local CPU Unit).
Intranet |
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SNTP server |
|
Automatic clock adjustment | |
| The clock information can be broadcast |
| to other CPU Units on the same Network. |
Ethernet |
|
24: 00: 00 | Ethernet Unit |
Clock data is obtained from the |
|
SNTP server and written at a particular |
|
time ro when a designated bit turns ON. |
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Note (1) The SNTP (Simple Network Time Protocol) server is used to control the time on the LAN.
(2)An error will occur in the following CPU Units when the automatic clock adjustment function is executed under the conditions shown in the table.
CPU Unit | Conditions |
|
|
CPU Units manufactured on or | When the CPU execution mode is set to other |
before January 31, 2003 (lot num- | than normal mode (priority peripheral servicing |
bers 030131 or earlier): | mode, parallel processing with synchronous |
memory access mode, or parallel processing | |
with asynchronous memory access mode). | |
AND | |
When the CPU Unit operating mode is set to | |
| RUN or MONITOR mode. |
|
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(3)The manufacturing date can be determined from the lot number on the side or top corner of the CPU Unit.
(4)The lot numbers are as follows:
YYMMDDnnnn, in which YY indicates the last two digits of the year, MM the month, DD the day, and nnnn the serial number.
(5)In accordance with SNTP protocol specifications, automatic adjustment will not be possible from February 7, 2036. In Ethernet Units, this function will no longer operate from February 7, 2036 (this status will not be dis- played as error information).
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