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Siemens
Basic Documentation RVP360
CE1P2546en
Building Technologies
17 Function block: Service functions and general settings
2017-07-24
17.5 Inputs for LPB
17.5.1 Source of time of day
Several sources are available for the time of day, depending on the master clock.
The source must be entered on the controller on operating line 178 (clock mode),
using setting 0…3:
0 = autonomous clock in the controller
1 = time of day via bus; clock (slave) without remote readjustment
2 = time of day via bus; clock (slave) with remote readjustment
3 = time of day via bus; central clock (master)
The impact of the individual inputs is as follows:
Input
Impact
Diagram
0
Time of day on the controller can be
readjusted
Time of day of controller is not
matched to the system time
1
Time of day on the controller cannot be
readjusted
Time of day of controller is continuous-
ly and automatically matched to the
system time
2
Time of day on the controller can be
readjusted and, at the same time, re-
adjusts the system time since the
change is adopted by the master
Time of day on the controller is never-
theless automatically and continuously
matched to the system time
3
Time of day on the controller can be
readjusted and, at the same time, re-
adjusts the system time
Time of day on the controller is used
for the system
t ch
Manual readjustment of time of day on the controller
t N
Controller time
t sys System time
Per system, only 1 controller may be used as a master. If several controllers are
parameterized as masters, an error message is delivered (error code 100).
