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Siemens Basic Documentation RVP340, RVP350, RVP351 CE1P2545en
Building Technologies 17 Function block: Service functions and general settings 15.03.2011
17.5.4 Bus power supply
In interconnected plants with a maximum of 16 controllers, bus power supply can
be decentralized, that is, power can be supplied by each connected device. If a
plant contains more than 16 devices, central bus power supply is mandatory.
In that case, it must be selected on every connected device whether the data bus
is powered centrally or decentrally by the controllers.
With the controller, this setting is made on operating line 179. The display shows
the selection made on the left and the current bus power supply state on the right.
Display Bus power supply
0 Central bus power supply is mandatory
(no power supply via controller)
A Decentral bus power supply via controller
0 No bus power supply presently available
1 Bus power supply presently available
BUS appears on the display only when a bus address is valid and bus power
supply is available. Hence, the display indicates whether or not data traffic via
data bus is possible.
17.5.5 Bus loading number
The bus loading number E of the RVP3.. for the LPB is as follows:
RVP340 = 6
RVP350 = 7
RVP351 no LPB
The sum of all bus loading numbers E of all devices connected to the same bus
must not exceed 300.
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