Burkert Type SE56 - Manual (Page 15)

TECHNICAL MANUAL Rev. Pagine 15/52
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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
15
bit11=1 if a new measurement value calculated for the display is available
bit12=1 if the counter block signal is active
bit13=1 if dosing is in progress
bit14=1 if a calibration cycle is in progress
bit15=1 if a Flow rate simulation is in progress
byte 14: (8 bits integer) measurement dynamic variation as a %
byte 15: (8 bits integer) Data Type ( see section 2.4 Data Type )
NOTE: The values in the “32 bits single precision IEEE floating point” format are floating point numbers
which can be represented during writing by any decimal digits. To keep the same numerical format visible
on the instrument display however, it is necessary to calculate the decimal figures with a rather complex
algorithm which takes account of instrument precision, flow rate measurement unit, etc. For this purpose
and to avoid useless calculations, the number of decimals to use to represent the flow rate values is supplied
separately. With the acyclic service it is possible to return the value ( see Acyclic Index Read = 20(dec)
Static Process Data of the Flow Meter byte position 13).
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)
2.4. DATA TYPE
The firsts four byte of the Dynamic Data Block are the information about the Flow rate.
After these bytes there are eight byte for the totalizers.
With the Control byte of the Configuration (see the Section Slave Configuration) it is possible to set the
type of the Flow rate returned by the slave and the type of totalizers.
There are six possible combination of type of data in base of the value inserted in the Control byte of the
Configuration string in the GSD file.
The byte 15 indicate the current type of data selected:
byte 15 = 0 --> Flow rate in %
totalizers positive or batch quantity ( batch quantity only for ML M3F )
partial totalizers positive or batch counter ( batch counter only for ML M3F )
byte 15 = 1 --> Flow rate in %
totalizers negative or batch quantity ( data valid only for ML 210 )
partial totalizers negative or batch counter ( data valid only for ML 210 )
byte 15 = 2 --> Flow rate in technical unit
totalizers positive or batch quantity ( batch quantity only for ML M3F )
partial totalizers positive or batch counter ( batch counter only for ML M3F )
byte 15 = 3 --> Flow rate in technical unit
totalizers negative or batch quantity ( data valid only for ML 210 )
partial totalizers negative or batch counter ( data valid only for ML 210 )
byte 15 = 4 --> Flow rate in %
totalizers positive or batch quantity ( batch quantity only for ML M3F )
totalizers negative or batch quantity ( data valid only for ML 210 )