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Using the Automatic Clock Adjustment Function Section 12-2
12-1-2 Specifications
12-2 Using the Automatic Clock Adjustment Function
12-2-1 Procedure
1,2,3... 1. Make the basic settings.
Refer to Initial Settings on page 34.
2. With the CX-Programmer online, right-click the EtherNet/IP Unit or built-in
EtherNet/IP port in the IO Table Dialog Box of the CX-Programmer, and se-
lect Edit - Unit Setup Set the following on the Auto Adjust Time Tab Page
of the Edit Parameters Dialog Box.
• SNTP server specification (required)
• Access to the SNTP server is enabled when writing clock information from
the SNTP server to the local CPU Unit when the Automatic Clock Adjust-
ment Switch is turned from OFF to ON and at a set automatic adjustment
time.
• Automatic clock adjustment setting.
3. To perform automatic clock adjustment manually, turn the Automatic Clock
Adjustment Switch from OFF to ON. (The Automatic Clock Adjustment
Switch is word n bit 05 in the words allocated in the CPU Bus Unit Area,
where n = CIO 1500 + (25
× unit number.)
4. Select Transfer to PLC from the PLC Menu and click the Yes Button. The
Unit Setup (CPU Bus System Setup) will be transferred to the CPU Unit
(the setting data will be transferred to the CPU Bus Unit System Setup Ar-
ea).
Item Specification
Protocol SNTP
Port number 123 (UDP)
Can also be set from the CX-Programmer in the Unit Setup.
Adjustment timing Automatic (fixed time) and manual (manual only cannot be
set)
Access to SNTP
server
Writes the clock information
from the SNTP server to the
local CPU Unit.
Obtains the clock information
from the SNTP server set up
on the Network, and applies
the information obtained to
the local CPU Unit.
Refresh timing When the automatic clock adjustment switch is turned from
OFF to ON and at a specified time.