Profibus pa – KROHNE MFC 400 Profibus User Manual
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PROFIBUS PA
22
MFC 400
www.krohne.com
06/2013 - 4002835301 - AD MFC 400 PROFIBUS R01 en
Profile specific Ident. Number (9742 hex)
Functionality is reduced to the requirements which are mandatory in the PA Profile; e.g. 3 x AI-
FB and 1 x TOT-FB are available for cyclic data transfer only. Device specific diagnosis
information is not available via cyclic PROFIBUS services. Nevertheless this behaviour will
improve interchangeability between devices of different vendors because only functions are
available which are provided by all PROFIBUS PA variable area flowmeters. Exchange is possible
without modifying the configuration of the control system.
Cyclic layout:
Valid GSD Modules:
GSD File required:
GSD file PA139742.GSD
PA139742.GSD
PA139742.GSD
PA139742.GSD is required in this mode. This file is provided by PROFIBUS International.
Take care that "Condensed Status and Diagnosis" is not supported by this file.
INFORMATION!
During network configuration the user has to define which function block outputs of the signal
converter should be transferred cyclically to the master. This is performed by a bus
configuration tool (e.g. "HW- Config" for PC-S7 from Siemens). This tool offers specific functions
as follows:
1. It is possible to configure an "Empty" block (the code of an "Empty" block is defined as 0x00) on
each block number. This implies: no data are transmitted in the cyclic data telegram for this
block.
2. There is NO "Totaliser (TOT)" function block allowed on block position 1, 2, 3, 7, 8, 9, 10 and 11!
On these positions, only an "Analog Input (AI)" function block or an "Empty" block is allowed!
(Note: All codes supported by "Analog Input (AI)" - and "Totaliser (TOT)"
–
function blocks will
be found in the corresponding GSD files.)
3. There is NO "Analog Input (AI)" function block allowed on block position 4, 5 and 6! On these
positions, only a "Totaliser (TOT)" function block or an "Empty" block is allowed!
4. There is a choice of 7 different totaliser functions, which can be allocated to the blocks 4, 5
and/or 6.
Slot
Description
Function Block type
Default unit
1
Mass Flow
AI-FB
kg/s
2
Density
AI-FB
kg/l
3
Temperature
AI-FB
K
4
Mass Totaliser
Totaliser-FB
kg
AI-FB
EMPTY_MODULE
AI
Totaliser-FB
EMPTY_MODULE
TOTAL
SETTOT_TOTAL
SETTOT_MODETOT_TOTAL
INFORMATION!
If another GSD file is used in the PROFIBUS master system the cyclic data transfer cannot be
established in this setting.