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Siemens Building Technologies
Basic Documentation RVL471
CE1P2524E
HVAC Products
25 Function block "Service functions and general settings"
23.10.2002
25.5 Entries for LPB
25.5.1
Source of time of day
Depending on the master clock, different sources for the time of day can be used. The
source must be entered on the RVL471, on operating line 178, using setting 0…3:
0 = autonomous clock in the RVL471
1 = time of day from the bus; clock (slave) with no remote readjustment
2 = time of day from the bus; clock (slave) with remote readjustment
3 = time of day from the bus; central clock (master)
The effect of the individual entries is as follows:
Input
Effect
Diagram
0
•
The time of day on the controller can be
readjusted
•
The controller's time of day is not matched
to the system time
Controller time
System time
Adjustment
1
•
The time of day on the controller cannot be
readjusted
•
The controller's time of day is automatically
and continually matched to the system time
System time
Adjustment
Controller time
2
•
The time of day on the controller can be
readjusted and, at the same time, readjusts
the system time since the change is
adopted by the master
•
The controller's time of day is nevertheless
automatically and continually matched to
the system time
System time
Adjustment
Controller time
3
•
The time of day on the controller can be
readjusted and, at the same time, readjusts
the system time
•
The controller time is used as a pre-setting
for the system
2524B
12e
System time
Adjustment
Controller time
In each system, only one controller may be used as a master. If several controllers are
set as masters, a fault status signal will be delivered (error code 100).
25.5.2
Outside temperature source
If, in interconnected plants, the outside temperature is delivered via the bus, the tem-
perature source can be addressed either automatically or directly (operating line 180).
•
Automatic
addressing:
Display, entry
Explanation
SET
A
(For automatic addressing)
ACTUAL
xx.yy
Display of source address selected by automatic addressing:
xx = segment number
yy = device number
•
Direct
addressing:
To be entered is the source address: xx.yy
xx = segment number
yy = device number
If the controller is operated autonomously (with no bus), there will be no display and no
entry can be made.
