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Siemens Building Technologies
Basic Documentation RVL471
CE1P2524E
HVAC Products
25 Function block "Service functions and general settings"
23.10.2002
If the controller is used in an interconnected plant and if it has its own outside sensor, it
is not possible to enter an address (if an entry is made, the display shows OFF). In that
case, the controller always uses the outside temperature signal delivered by its own
sensor. The address displayed is its own.
For detailed information about addressing the outside temperature source, refer to Data
Sheet CE1N2030E.
25.5.3
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 169) and a segment number
(0...14, operating line 170).
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), the device number must be set
to zero.
Since the device address is also associated with control processes, it is not possible to
use all possible device addresses in all types of plant:
Plant type
G = 0
S = any
(no bus)
G = 1
S = 0
G = 1
S = 1...14
G = 2...16
S = any
1–x
Permitted
Permitted
Permitted
Permitted
2–x
Permitted
Permitted
Permitted
Not permitted
3–0
3–2
3–4
3–5
Permitted
Permitted
Permitted
Permitted
3–1
3–3
Permitted
Not permitted
Permitted *)
Not permitted
4–x
Not permitted
Permitted
Permitted
Not permitted
5–x
Not permitted
Permitted
Permitted
Permitted
6–x
Not permitted
Permitted
Permitted
Not permitted
G = device number
S = segment number
*) No other controller may be addressed in
the same segment!
If an inadmissible address has been entered, an error message will appear (error code
140).
For detailed information about the addressing of devices, refer to Data Sheet
CE1N2030E.
25.5.4
Bus power supply
In interconnected plants with a maximum of 16 controllers, the bus power supply may
be decentralized, that is, power may be supplied via each connected device. If a plant
contains more than 16 devices, a central bus power supply is mandatory.
On each connected device, it is then necessary to set whether the data bus is powered
centrally or decentrally by each controller.
With the RVL471, this setting is made on operating line 179. The display shows the
current setting as SET and the current bus power supply status as actual.
