Burkert Type SE56 - Manual (Page 17)

TECHNICAL MANUAL Rev. Pagine 17/52
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03 PROFIBUS DP MODULE- DATA LINK
DESCRIPTION
Document Data Date Date
File name ProfibusDP_emanual_Burkert_04.doc 19/03/08 19/03/08 19/03/08
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NOTE:The counters are expressed with a 32 bit integer. The «counter decimal figures» parameter, indicates
the point position starting from the right: 0 = no decimal, 1=1 decimal figure, and so on. ( see Acyclic
Index Read = 20(dec) Static Process Data of the Flow Meter byte position 12)
2.6. DATA TYPE
The firsts four byte of the Dynamic Data Block are the information about the Flow rate.
With the Control byte of the Configuration in the GSD file (see the Section Slave Configuration) it is
possible to set the type of the Flow rate returned by the slave.
The type of the Flow rate may be in % or in technical unit in base of the value of the Control byte inserted
in the Configuration string.
The byte 23 indicate the current type of data selected:
byte 23 = 0 --> Flow rate in %
byte 23 = 1 --> Flow rate in technical unit
For details see the Section Slave Configuration.
There is a second way to set the type of the Flow rate using the Acyclic Service during data exchange (see
section Acyclic Service).
2.7. FOURTH CONFIGURATION: 16 BYTE INPUT/OUTPUT
With the precedent configurations, the type of data as Static Data and other parameters of the Flow meter,
the only possible way for to return the data was with Acyclic Service and Class 1 or Class 2 Master.
In the same way the insertion of data in the slave was with Acyclic Service.
If the Master don't support the Acyclic Service, with this configuration it is possible, with two indexes, read
and write Static Data and insert data to the slave as Output data.
With the Output data it is possible the insertion of the values of the two Indexes used for the selection of
the type of data returned with the Input data, for example the Static Data or others parameters, and insert
other data as the Time of the clock of the Flow meter and other parameters.
The two indexes used for the selection and the insertion of the data are:
INDEX Input
INDEX Output
The two indexes are inserted with the Output data during the cyclic data exchange in the firsts two byte of
the 16 Output data ( see the structure of the 16 bytes below in this section ).
The current value of the two index are returned with the first two byte of the 16 bytes Input data ( see the
structure of the 16 bytes below in this section ).
The byte INDEX Input in the 16 bytes of the Output data, is used for the selection of the type of data
returned with the 16 Input data.
With the value inserted in this byte it is possible to select the type of the Dynamic Data retuned or the
type of the Static Data or other internal parameter of the Flow meter or of the Slave as for example the
Profibus address etc.
The byte INDEX Output in the 16 bytes of the Output data, is used for indicate the type of information that
are inserted with the successive bytes that follow the two indexes ( byte 2 --> 15 ) in the 16 Output data.
For example with the value inserted in this byte it is possible to indicate that the bytes that follow the firsts