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4.1.1.2
Output Data (to the Device)
The output data consist of one byte each per resettable totalizer (net, forward and reverse) of which only
the two respective least significant bits are evaluated. All other bits are not evaluated but should be set to
0. This value represents the SET_TOT parameter of the totalizer function block defined in the PROFIBUS
PA profile.
Bit
Profile description
1
0
0
0
cancel
0
1
reset
1
0
preset
Table 4--7
Totalizer mode SET_TOT
The transferred value is effective until it is changed, i.e. after the value 1 (reset totalizer) is sent, for
example, the totalizer will remain on the value 0 until the SET_TOT parameter is changed again.
Each SET_TOT value affects the corresponding totalizer independently of the others. The quantities are
also cumulated independently of each other, i.e. the net quantity does not have to be equal to the sum of
the quantity forwards and quantity reverse especially if a totalizer has been reset or was preset.
4.1.1.3
Device Data Base File (GSD File)
The device data base file (GSD file) is used to configure the format and order of the cyclical data. The
standard GSD for ultrasonic flow transducers described in profile 3.0 and which does not support
manufacturer-specific expansions can be used alternatively to the device-specific GSD ("siem8091.gsd",
see appendix 9). The "IDENT_NUMBER_SELECTOR acyclic parameter must be set to select the GSD
(0 = profile GSD, 1 = manufacturer-specific GSD = factory setting).
All permitted identifiers are listed in the GSD for each measured value (= module). They can be combined
freely with the limitation that only one identifier can be used per module and the order of the identifiers
must coincide with the order of the modules.
The identifier formats "short" (identifier byte) and "long" (extended identifier) are accepted for the flow,
sound velocity, temperature and ultrasonic amplitude. The "long" and "resettable quantity ... long" are
accepted for the totalizer modules. The identifiers are checked independently of each other, i.e.
combinations with different formats are permitted when several measured values are queried. At least one
measured value must be queried, i.e. the number of the identifier must be at least 1 and may be
maximum 7.
The order of the measured values in the cyclical telegram defined in the GSD is set and cannot be
changed (see also chapter 4.1.1, page 11).
For the configuration data this means that the first identifier always represents the flow, the second the
sound velocity, ... , the last the quantity reverse. If you want to omit a measured value, set "Free Place" as
the identifier.
SITRANS F with PROFIBUS PA
C79000-B5676-C114-03
Meaning
Totalizer is running
Totalizer is stopped and reset to 0
Totalizer is stopped and reset to a preset value (PRESET_TOT
parameter, only acyclic access)
Instruction Manual
15
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