Basic Documentation

31/332
Siemens Universal controllers RMU710B, RMU720B, RMU730B CE1P3150en
Building Technologies General settings 03.10.2011
5.1.2 Communication
Time of day and date can be exchanged via bus. The controller can be
autonomous, slave or master.
The following setting available for clock time operation:
 Autonomous (neither transmits nor receives)
 Slave: Time-of-day slave (receives the synchronization signal from the bus)
 Master: Time-of-day to bus (sends the synchronization signal to the bus)
Commissioning > Communication > Basic settings >
Operating line Range Factory setting
Clock time operation Autonomous, Slave, Master Master
If the controller is set as a time-of-day slave, it can also be selected whether it shall
be possible to manually adjust the master clock’s time of day from this controller.
For remote adjustment of the clock slave, the following setting choices exist:
 No (clock time slave with no adjustment facility for the system time)
 Yes (clock time slave with adjustment facility for the system time)
Commissioning > Communication > Basic settings >
Operating line Range Factory setting
Remote setting clock
slave
Yes, No Yes
The individual settings have the following effect:
Time of day op Rem. setting
clock slave Effect Diagram
Autonomous No effect
 The time of day on the controller can be readjusted
 The controller's time of day is not adapted to
system time
Contr. time System time
Readjustment
Slave No
 The time of day on the controller cannot be
readjusted
 The controller's time of day is cont. and
automatically adapted to system time
Contr. time System time
Readjustment
Slave Yes
 The time of day on the controller can be readjusted
which changes system time
 The controller's time of day is cont. and
automatically adapted to the system time
Contr. time System time
Readjustment
Master No effect
 The time of day on the controller can be readjusted
which changes system time
 The controller’s time of day is used for the system
3140Z06
Contr. time System time
Readjustment
Only one clock time master per system allowed. A fault status message issued if
several controllers are parameterized as masters.
If possible, we recommend to operate the controller via the bus with a
synchronized time of day as described in this section.
Setting values
Setting values
Recommendation