Time Data Handling - Mitsubishi Electric MELSEC Q Series User Manual

3 SPECIFICATIONS

3.9 Time Data Handling

Error
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This section explains the time data handled by the Web server module.
(1) Time data handled by Web server module
The Web server module acquires and uses the clock data of CPU No. 1 at the
following timings. ( )
 When the programmable controller is powered off and then on or the CPU
module is reset
 Every 60 seconds
The time data is used mainly for the time stamp of logging and event history
files and the time specification of logging and event monitor.
(2) Precautions for time data handled by Web server module
(a) Before operating the Web server module, complete the clock data setting of
CPU No. 1.
For the clock data setting, refer to the user's manual of the used CPU
module.
(b) Errors will be produced in the clock data of CPU No. 1 used for the Web
server module.
For accuracy of the clock data, refer to the user's manual of the used CPU
module.
(c) When the Web server module acquires the clock data of CPU No. 1, a
maximum delay of one second occurs as transfer time. Hence, an error of
one second may be produced in the logging data time on rare occasions
when the clock is adjusted.
(Example) Error in logging data time
2003/10/01 15:48:32.8
2003/10/01 15:48:32.9
2003/10/01 15:48:32.0
2003/10/01 15:48:32.1
2003/10/01 15:48:32.2
(d) The clock data of CPU No. 1 is acquired by the Web server module at the
timings indicated in (1). Therefore, when the clock data of CPU No. 1 is
changed during operation, the time of the Web server module will be
changed in a maximum of 60 seconds.
1028 30.5
1029 31.5
1030 32.5
1031 33.5
1032 34.5
Data are sampled normally at 100ms intervals.
MELSEC-Q
21.8 15.9
22.8 16.9
23.8 17.9
24.8 18.9
25.8 19.9
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