6 Examples of combinations in the function table
The examples describe combinations of signals of the device series ACU. The combination pro-
cedure is the same in the different device series. The names of the signal sources may be dif-
ferent.
6.1 Write index and read index
6.1.1 Write index and read index for FT-instructions
Via the write and read indices, the index of the instruction the parameters of which are to be
read or written is specified. VTable uses the parameters automatically for writing and reading.
The write and read parameters are required for parameterization via the keypad of a control
unit or via a bus system (e.g. PROFIBUS).
Write index and read index for parameterization and reading of FT-instructions via
software VPlus
The FT-instructions can be parameterized in the user interface VPlus or in the function table
VTable. In the user interface VPlus, an index of the function table can be created via parameter
FT-Write Index (FT-Table Item) 1341. The chosen index corresponds to a column in the func-
tion table. The settings of parameters
1343 to 1351 are applied to the selected index of the
function table. Via parameter
FT-Read Index (FT-Table Item) 1342, the values of a selected
index can be read from the function table.
Parameters Setting
No. Description Min. Max. Fact. sett.
1341 FT write index (FT table item) 0 65 1
1342 FT read index (FT table item) 0 65 1
Settings for fixed parameterization
(non-volatile):
Settings for non-fixed parameterization
(volatile):
0: all instructions in EEPROM 33: all instructions in RAM
1 … 32: individual instructions in EEPROM 34 … 65: individual instructions in RAM
Note:
The settings "0" or "33" for FT Write Index (FT table Item) 1341 change all indices of a para-
meter in the EEPROM or RAM.
In the case of non-volatile storage (0..32), the changed values are still available when power
supply is switched on again.
In the case of volatile storage (33…65), the data is only stored in RAM. If the unit is switched
off, this data is lost and the data required are loaded from EEPROM.
Caution!
Writing of the EEPROM is restricted to approx. 1 million times. If this number is
exceeded, the device may be damaged.
Definition:
Instruction RAM = instruction EEPROM + 33
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