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Building Technologies Modular Heating Controller RMH760B CE1P3133en
HVAC Products 4 General settings 05.02.2007
Main menu > Commissioning > Communication > Basic settings
Operating line Range Factory setting
Clock time operation
Autonomous / slave /
master
Autonomous
Remote setting clock slave Yes / No Yes
If the controller is set as a clock time slave, it can also be selected whether it shall be
possible to adjust the master clock’s time of day from this controller.
The following settings for the remote clock time slave can be made:
• No (clock time slave with no adjustment facility for the system time)
• Yes (clock time slave with adjustment facility for the system time)
The effect of the individual entries is as follows:
Entry Effect Diagram
Autonomous
• The time of day on the controller
can be readjusted
• The controller's time of day is not
matched to the system time
Contr. time System time
Readjustment
Slave,
Remote setting
clock slave No
• The time of day on the controller
cannot be readjusted
• The controller's time of day is
continuously and automatically
matched to the system time
Contr. time System time
Readjustment
Slave,
Remote setting
clock slave Yes
• The time of day on the controller
can be readjusted which, at the
same time, readjusts the system
time
• The controller's time of day is
continuously and automatically
matched to the system time
3140Z06
Contr. time System time
Readjustment
Master
• The time of day on the controller
can be readjusted and, at the same
time, readjusts the system time
• The controller's time of day is
continuously and automatically
matched to the system time
Contr. time System time
Readjustment
Only one clock time master per system may be used. If several controllers are param-
eterized as masters, a fault status message will be delivered.
The plant should always be operated in a synchronized manner.
4.1.3 Fault handling
If the clock on the bus is missing and the local clock is parameterized as the clock time
slave, operation continues with the internal clock and a fault status message System time
failure will be delivered.
In the event of a power failure, the clock has a reserve (minimum 12 hours, typically 48
hours).
If the controller loses its time of day after a power failure and the time is not retransmit-
ted via bus, fault status message Invalid time of day will be forwarded.
An invalid time of day flashes.
Setting values
Recommendation
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