Mitsubishi MELSEC-Q Series User Manual page 134

4
FUNCTIONS
(4) Changing and reading clock data
(5) Clock data accuracy
(6) Precautions
4
- 61 4.8 Clock Function
(a) Changing clock data
The clock data may be changed by either of the two methods: "Using C Controller
setting utility" and "Using user program".
1) Using C Controller setting utility
When using the C Controller setting utility, click the
<<Online operation>> tab, and change the clock data on the <<Clock>> tab.
Figure 4.46 Clock data write from C Controller setting utility
2) Using user program
In user programs, change the clock data using the clock data setting function
(QBF_SetTime function).
The C Controller module's clock can be adjusted by obtaining the clock data of
an external computer or a programmable controller CPU on the network and
setting the C Controller module clock data again with the QBF_SetTime
function.( Chapter 10)
(b) Reading clock data
To read clock data, use the clock data reading function (QBF_GetTime function) in
the user program.(
The clock function accuracy varies depending on the ambient temperature.
( Section 3.2)
(a) Clock data setting for initial use
The clock data of the C Controller module is not factory-set.
The clock data are used for features such as event history of the C Controller
module system and intelligent function modules.
When using the C Controller module for the first time, be sure to set the accurate
time.
(b) Click data setting when battery is not installed
Always set the clock data when no batteries are installed to the C Controller
module.
Without batteries, the clock data are illegal when the C Controller module is
powered on.
Chapter 10)
button on the
Detail