Profibus Dp/Pa Cyclic Data Transfer; Block Model; Modules For Cyclic Data Transfer - Endress+Hauser Proline Promag 50 Operating Instructions Manual

Commissioning
!
80
6.5

PROFIBUS DP/PA cyclic data transfer

6.5.1

Block model

The block model shows which input and output data the measuring device provides for cyclic data
transfer via PROFIBUS.
Physical
Block
Transducer
Signal
processing
PROFIBUS
Esc
- + E
Manufacturer
Fig. 51: Block model for Promag 50 PROFIBUS DP/PA Profile 3.0
6.5.2

Modules for cyclic data transfer

The measuring device 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.
The following section describes the modules that are available for cyclic data transfer with the
Promag 50 GSD file (complete device functionality).
Note!
When integrating the modules, please observe the configuration instructions on Page 84.
AI module (Analog Input)
The volume flow incl. the status is cyclically transmitted to the PROFIBUS master (Class 1) by
means of the AI module. The volume flow is portrayed in the first four bytes in the form of a floating
point number in accordance with the IEEE 754 standard. The 5th byte contains standardized status
information on the measuring device. Further information on the device status is provided on
→ Page 94.
Input data
Byte 1 Byte 2
Volume flow (IEEE 754 floating-point number)
Factory setting
Module
AI
XXX.XXX.XX Local
XXX.XXX.XX
Display
block
Volume flow
Analog Input
Function block
PROFILE
Parameter
Volume flow
Totalizer
specific
Function block
Parameter
Byte 3 Byte 4
Output variable ID for the CHANNEL
Volume flow
Proline Promag 50 PROFIBUS DP/PA
Output value AI
Out value TOTAL
Off
Configuration SETTOT, MODETOT
Display value DISPLAY_VALUE
Control CONTROL_BLOCK
Byte 5
Status
Unit factory setting
parameter
273
Endress+Hauser
F06-50PBxxxxx-05-xx-xx-en-001
3
m /h