Mitsubishi Electric MELSEC Q Series User Manual page 205

(2) Precautions
(a) Timeout
Communication times out in 20 seconds from time query.
(b) Delay due to communication time
The set time delays due to time for communication with the time information server.
For high-accuracy time setting, use a time information server as close as possible on the network.
(c) Time setting function in multiple CPU system configuration
Enable the time setting function only when the C Controller module is No.1.
For details of the clock function, refer to the following.
Page 160, Section 11.4
(d) VN (Version Number) in the SNTP request
For Q24DHCCPU-V/-VG/-LS and Q26DHCCPU-LS that comes first five digits "17091" or lower of serial No.,
the VN (Version Number) in the SNTP request is Version 1.
For Q24DHCCPU-V/-VG/-LS and Q26DHCCPU-LS that comes first five digits "17092" or higher of serial No.,
the VN (Version Number) in the SNTP request can be changed to Version 1 (default setting) or Version 4.
For changing the VN (Version Number), use the following functions in Setting/monitoring tools for the C
Controller module.
•
Project view  "Parameter"  "CCPU Parameter"  <<I/O assignment settings>>  "Switch
Settings"
If the settings of the system Ethernet port are changed, the settings of the user Ethernet port will also be
changed. (Page 199, Section 12.1.3)
Set the b2 of the "Switch3" in the slot connected with the C Controller module to "ON". (Doing this to the other
CPU slots, the setting is ignored.)
b15 b14 b13
• When the b2 is ON
Set the VN (Version Number) in the request to Version 4 and then send to the SNTP server. If the
destination SNTP server is not compatible with the Version 4, it will fail in time inquiry.
• When the b2 is OFF
Set the VN (Version Number) in the request to Version 1 and then send to the SNTP server.
b12 b11 b10 b9 b8 b7
CHAPTER 12 FUNCTIONS ACCESSED VIA ETHERNET PORTS
b6 b5 b4 b3 b2
ON
b1 b0
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