Mitsubishi Electric Melsec Q Series User Manual page 181

7
MES INTERFACE FUNCTION CONFIGURATION TOOL
(4) Precautions on the time synchronization function
(a) Synchronizing time with SNTP server computer
(b) Synchronizing time with programmable controller CPU
1) When [Synchronize with SNTP] is selected, an SNTP server computer is
required.
Note that the SNTP server computer must have the time synchronization
server function.
2) If time information cannot be obtained at the time of powering ON the
programmable controller from OFF or resetting the programmable controller
CPU, the MES interface module operates in time synchronization with CPU
No.1 until successful time information acquisition.
When the clock time of CPU No.1 is different from that of the SNTP server
computer, the clock time of the MES interface module is changed when time
information is successfully obtained from the SNTP server computer. Because
of this, tag sampling timing and job operation timing may be changed.
1) Before using the MES interface module, set the time of CPU No.1.
Changing time setting during operation of the MES interface module changes
its clock time at the timing of time data acquisition. Because of this, tag
sampling timing and job operation timing may be changed.
2) Since the MES interface module obtains time data of CPU No.1 in the following
timings, transmission time delay may occur.
• When powering ON the programmable controller from OFF
• When resetting the programmable controller CPU
• Once a minute
3) When obtaining the clock data of CPU No.1, an error of up to "scan time of
CPU No.1 plus 1 second" may be observed.
When using the time information, which is obtained from the SNTP server
computer, in the programmable controller CPU
Section 6.3.1 Using the SNTP time query result in the programmable
controller CPU
7.6.2 Setting items in Time synchronization setting
7.6 System Setting
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