Description
2.4 Clock
Caution
This control unit must be operated with a fan/battery module for heat dissipation. Without a
fan/battery module, the control unit will not start up and cannot be commissioned.
2.4 Clock
Features of real-time clock
The following table contains the features and functions of the control unit clock.
Table 2-1 Clock features
Features Meaning
Type Hardware clock (integrated "realtime clock")
Default setting when delivered DT#1994-01-01-00:00:00
Accuracy
With supply voltage on
0 to 55° C
With supply voltage off
25° C
-20° C to 70° C
Max. deviation per day:
±9 s
±2 s
+2 s to -9 s
Backup time Typically 5 days (at 0 to 25° C)
Charging time 1 hr
With power OFF
In the power OFF state, the control unit clock continues to run during the the backup time
(with the exception of the software clock). The buffer is recharged in the power ON state.
An error message is output if the backup function is defective. With power ON, the clock
resumes at the time set at the factory.
When the control unit is reset to the factory settings, the clock is also reset to the "factory
default setting."
D4xx
2-4 Manual, 12.2004, 6AU1900-1AJ32-0BA0
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