Data Blocks (Dbs) - Siemens 3VF Series Communications Manual

Communication System Manual

3.5.3.4 Data blocks (DBs)

The send and/or receive data block and a message header data block must be configured by the user
unless the DBs supplied with the example are to be used. The maximum used length of such a data
block is 261 bytes, i.e. the data block must be configured up to and including data word 255. The length
is not checked.
The block-type structure is as follows (see also Program listing):
Data word 0: Symbol for value to be processed acc. to profile (parameter identifier) - T-Nr. 0
Data word 1: Symbol as sub-item for value to be processed (parameter subindex) - T-Nr. 0
Data word 2: Symbol for value to be processed acc. to profile (parameter identifier) - T-Nr. 1
Data word 3: Symbol as sub-item for value to be processed (parameter subindex) - T-Nr. 1
Data word 4: Symbol for value to be processed acc. to profile (parameter identifier) - T-Nr. 2
Data word 5: Symbol as sub-item for value to be processed (parameter subindex) - T-Nr. 2
etc.
The user himself is responsible for entering the correct values in the data block, as well as for creating
a data block of the correct length. The user must configure the DB up to at least data word 2x+1 (where
x = maximum occurring T-Nr.).
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