Commissioning Proline Promass 83 PROFIBUS DP/PA
98 Endress+Hauser
BATCHING_FIX_COMP_QUANTITY module - cyclic transmission of the fixed
compensation quantity (tail quantity)
A positive or negative compensation quantity (32-bit floating-point number) incl. status can be
cyclically transmitted from the automation system to the measuring device by means of the
BATCHING_FIX_COMP__QUANTITY module. The compensation quantity balances out a
constant, system-related incorrect quantity. This can be caused, for example, by a pump over-
running or by the closing time of a valve. The compensation quantity is determined by the system
operator. A negative compensation quantity must be specified for overbatching and a positive
compensation quantity for underbatching. The permitted input range is +/- 10% of the batch
quantity. The unit selected in the measuring device is used as the unit.
Further information is available in Operating Instructions BA064/06/en, FIXED COMPENSATION
QUANTITY parameter.
!
Note!
• This module is only evaluated by the measuring device if the additional “batching” software is
installed in the measuring device (order option).
• The compensation quantity affects batching quantity only and does not affect the after run
compensation.
• If the input range is not sufficient for the compensation quantity, the batching quantity may have
to be adjusted.
• The fixed compensation quantity is a non-volatile device parameter. If this parameter is modified
via the PROFIBUS, the change is saved in the EEPROM of the measuring device. The number of
writes to the EEPROM is technically restricted to a maximum of 1 million. Attention must be paid
to this limit since, if exceeded, it results in data loss and measuring device failure. For this reason,
avoid constantly writing this device parameter via PROFIBUS!
Data structure of the BATCHING_FIX_COMP__QUANTITY module:
Status:
The status is not evaluated by the device.
EMPTY_MODULE module
Promass 83 is a modular PROFIBUS slave. In contrast to a compact slave, the structure of a modular
slave is variable - it consists of several individual modules. In the GSD file, the individual modules
are described with their individual properties. The modules are permanently assigned to the slots,
i.e. the sequence or arrangement of the modules must be observed when configuring the modules.
Gaps between configured modules have to be assigned the “EMPTY_MODULE” module.
For a more detailed description, see → Page 99
Byte 1 Byte 2 Byte 3 Byte 4 Byte 5
Fixed compensation quantity Status
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