138
8.2
Precautions
(1) Communication timeout
A communication timeout occurs when 20 seconds have elapsed without receiving any response after sending a
time query.
At the time of a communication timeout, the value in SD1270 is FFFF
H
.
(2) Time information server
When the time setting function is used, an SNTP server (time information server) is required on the LAN.
(3) Delay resulted from the time required for communication
A delay occurs and affects the set time as a result of the time spent for communication with the SNTP server
computer. For a high-accuracy time setting, specify an SNTP server computer that is networked as close to the
CPU module as possible.
(4) For multiple CPU system configuration
In a multiple CPU system, enable the time setting function of only the Built-in Ethernet port QCPU No.1. When a
CPU module other than the Built-in Ethernet port QCPU No.1 is enabled, the clock data of the Built-in Ethernet
port QCPU No.1 is automatically set.
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