Manual

4. Parametrizing blocks
4−11
Festo P.BE−SFC−DC−PB−S7−EN en 0604NH
4.4.1 Description of method of operation
A list of the desired parameters must be saved in a global DB,
a parameter must be composed as follows:
Fig.4/5: Composition of a parameter
The byte Accessrights" is a reserve byte for additional
implementations, e.g. parameters with a certain identification
could be omitted from write−read authorization during
parametrizing.
The data block must correspond to an array of this structure
(n*10BYTE). A source and a target DB, which must be of the
ame length (n*10BYTE),
must be specifed for the transfer.
From the source DB you can read the parameters which are to
be read or written. In the case of reading, the read para
meters will then be transferred to the target DB. The same DB
can be specified for source and target. Only the parameter
values
will be transferred.
The data type for the parameter value always has the length
of a double word. It is therefore independent of the para
meter to be transferred. It occupies memory space but re
duces the problem in handling. If a parameter with length 1 is
transferred, the above−named three bytes will
be ignored.
Vice−versa when reading the above−named three byted will be
assigned with zeros. How the parameter value is to be inter
preted can be found in the description of the parameter.
The transmission is started with the bit Start_RxTx.
The progress of the transmission will be shown in % at the
Progress"
output. The transmission is completed when the
bit Done_RxTx supplies TRUE.