35/69
Siemens Building Technologies
Electronic Air / Fuel Ratio Control System
CC1P7873.1en
HVAC Products
12 Data storage module RZD20
15.10.2002
12 Data storage module RZD20
All setting values of the RVW26… are stored in both the microcomputer's memory
and
in the exchangeable data storage module RZD20.
In both, the data are stored in nonvolatile memory.
Fig. 21
Removal of the data storage module RZD20
Using the data storage module, it is possible to
·
adopt settings made on the control unit:
When changing the RVW26…, the
relevant settings can be transferred by plugging the module into units of the same
series
·
duplicate settings made on the control unit:
Settings can be copied to any
number of data storage modules and be used as a basic setting for other units of
the same series
·
easily set the parameters of
replacement control units
that use exactly the same
settings
The transfer of data between the RZD20 and the internal data storage is accomplished
with the «Get_Par» and «SavePar» commands on programming level 7 (refer to «Pro-
gramming»).
Micro-
computer
RVW26
«SavePar»
Data
storage
module
RZD20
Data
storage
(internally)
«Get_Par»
78731e01e/1001
Micro-
computer
RVW26
Data
storage
module
RZD20
Data
storage
(internally)
Fig. 23
Data transfer between the RZD20 and the internal data storage
Note:
The setting values in the internal and external data storage are cyclically checked to
make certain they are identical.
If they are not identical, the unit will initiate lockout.
This means that when adopting the data of another unit via the RZD20, there must al-
ways be a transfer of data to the internal data storage (command «Get_Par»).
When changing a parameter, that parameter will automatically be stored in both
the internal data storage and the data storage module RZD20.
