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System integration
94
9.5
Cyclic data transmission
Cyclic data transmission when using the device master file (GSD).
9.5.1
Block model
The block model shows which input and output data the measuring device makes available
for cyclic data exchange. Cyclic data exchange takes place with a PROFIBUS master (Class
1), e.g. a control system.
Analog Input block 1 to 8
Totalizer block 1 to 3
Flow
Block
Analog Output block 1 to
5
Discrete Input block 1 to 2
Discrete Output block 1 to
7
Defined order of modules
The measuring device works as a modular PROFIBUS slave. In contrast to a compact slave,
a modular slave has a variable design and consists of several individual modules. The
device master file (GSD) contains a description of the individual modules (input and output
data) along with their individual properties.
The modules are permanently assigned to the slots, i.e. when configuring the modules, the
order and the arrangement of the modules must be respected.
Slot
1 to 8
9
10
11
12 to 16
17 to 18
19 to 25
To optimize the data throughput rate of the PROFIBUS network, it is advisable to only
configure modules that are processed in the PROFIBUS master system. If this results in
gaps between the configured modules, these gaps must be assigned to the
EMPTY_MODULE.
9.5.2
Description of the modules
The data structure is described from the perspective of the PROFIBUS master:
• Input data: Are sent from the measuring device to the PROFIBUS master.
• Output data: Are sent from the PROFIBUS master to the measuring device.
Proline Promass O 500 PROFIBUS DP
Measuring device
→ 95
Output value AI
Output value TOTAL
→ 96
Controller SETTOT
Configuration MODETOT
→ 98
Input values AO
→ 99
Output values DI
→ 100
Input values DO
Module
AI
TOTAL or
SETTOT_TOTAL or
SETOT_MODETOT_TOTAL
AO
DI
DO
Control system
→
→
←
←
PROFIBUS DP
←
→
←
Function block
Analog Input block 1 to 8
Totalizer block 1
Totalizer block 2
Totalizer block 3
Analog Output block 1 to 5
Discrete Input block 1 to 2
Discrete Output block 1 to 7
Endress+Hauser
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