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Building Technologies
Boiler sequence controller RMK770
CE1P3132en
HVAC Products
4 General settings
23.04.2009
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 remote settings for the clock time slave are possible:
•
No (clock time slave with no facility for setting the system time)
•
Yes (clock time slave with facility for setting the system time)
The individual settings have the following impact:
Entry Effect
Diagram
Autonomous
•
The time of day on the controller
can be adjusted
•
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 adjusted
•
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 controller’s time of day can be
adjusted and, at the same time, the
system time is adjusted
•
The controller’s time of day is
continuously and automatically
matched to the system time
31
40Z
06
Contr. time
System time
Readjustment
Master
•
The time of day on the controller
can be readjusted and, at the same
time, adjusts 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 is 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” is delivered.
In the event of a power failure, the clock has a reserve of 12 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“ is delivered.
An invalid time of day blinks.
Number Text
Effect
5001
System time failure
Nonurgent message; must not be acknowledged
5002
>1 clock time master Nonurgent message; must be acknowledged
5003
Invalid time of day
Nonurgent message; must not be acknowledged
Recommendation
Fault status messages
