Siemens RVD240 - 20 Function Block LPB Parameters; Operating Lines; LPB Parameters; Addressing the Devices

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Siemens Building Technologies Basic documentation RVD240 CE1P2384en
HVAC Products 20 Function block LPB parameters 27.05.2004
20 Function block LPB parameters
20.1 Operating lines
Line Function, parameter Unit
Factory
setting
Range
131 Device number for bus address 0 0...16
132 Segment number for bus address 0 0...14
133 Clock mode 0 0...3
134 Bus power supply, operating mode and status indication A 0 / 1 / A
135 Outside temperature source A A / 00.01...14.16
136 Gain of locking signal % 100 0...200
137 Response to uncritical locking signals from the data bus 1 0 / 1
20.2 LPB parameters
20.2.1 Addressing the devices
Each device connected to the data bus (LPB) requires an address. This address is
comprised of a device number (1...16, operating line 131) and a segment number
(0...14, operating line 132).
In an interconnected plant, each address may be assigned only once. If this is not ob-
served, proper functioning of the entire plant cannot be ensured. In that case, a fault
status signal will be generated (error code 82).
If the controller is operated autonomously (with no bus), both the device number and
the segment number must be set to zero.
Since the device address is also associated with control processes, it is not possible to
permit all possible device addresses in all types of plant:
If an inadmissible address has been entered for the selected type of plant, a fault status
signal will appear (error code 140).
For detailed information about the addressing of devices, refer to Data Sheet N2030.
20.2.2 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 controller on operating line 133, as a digit (0…3):
0 = autonomous clock in the RVD240
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 on 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 automati-
cally and continually matched to the sys-
tem time
System time
Adjustment
Controller time