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OSIRIA secondary clocks
Updated: Jan-14 (Subject to change) Page 13 of 15
7 APPENDIX
7.1 Hand reset to zero
When setting the hand to zero, the hour and minute hands are moved to a set position (12:00).
This makes it possible to ensure the exact positioning of the hands during normal operation.
The hand is reset to zero:
After receiving a 1 on the Force synchonisation object.
After first receipt of a time after restoration of bus voltage.
7.2 Synchronisation behaviour of clock
The control unit must have received at least one time telegram to set the clock.
If no date has been received, 1.1.2001 will be used as a start date (Only for models
with date display).
If the clock receives a time for the first time or the new time differs by more than 5
seconds from the internal time then the time will be set after the hands have been reset
to zero again.
If the time only differs by 1 - 5 seconds, then the correction will be made between the
39th and 41st minutes in an hour.
Example: A time telegram with a difference of 4 seconds is received at 9:10.
The difference is corrected between 9:39 and 9:41.
The clock resets itself when receiving the first time telegram after the restoration of
bus voltage. This happens even if the time was not set correctly.
If the hand is reset to zero via the bus (force synchronisation or
new time), then the clock will stop immediately and perform the zero reset.
7.3 Troubleshooting
Remove bus terminal.
Put bus connection terminal back in again.
The clock automatically resets after it has received a carrier signal (as with initial
set-up)
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