Precautions - Mitsubishi Electric Q03UDVCPU User Manual

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
(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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