VEGA VEGABAR 66 Profibus PA - Manual (Page 61)

61
10 Supplement
VEGABAR 66 • Profibus PA
36739-EN-130321
When using the profile-specific GSD file, the PA-OUT value as well as the temperature
value are transmitted to the PLC (see block diagram "Cyclical data traffic").
Cyclical data traffic
The master class 1 (e.g. PLC) cyclically reads out measured values from the sensor during opera-
tion. The below block diagram below shows which data can be accessed by the PLC.
bar % Lin%
Min-Max
adjustment Linearization
PROFIBUS PA-output
Primary
Value
Secondary
Value 1
Secondary
Value 2
Target
Mode
Failure
mode
Alarms Scaling
Source for
scaling
t
i
Damping
Sensor
characteristics
PA-Out
TB
FB
Select additional cyclic
value
Sensor mounting
correction
Fig. 33: VEGABAR 66: Block diagram with AI (PA-OUT) value and Additional Cyclic Value
PROFIBUS PA-output
Target
Mode
Failure
mode
Alarms Scaling Source for
scaling
t
i
Damping
Sensor
characteristics
PA-Out
°C
TB
FB 2
Fig. 34: VEGABAR 66: Block diagram with temperature value
Module of the PA sensors
For the cyclic data traffic, VEGABAR 66 provides the following modules:
•
AI (PA-OUT)
– PA-OUT value of the FB1 after scaling
•
Temperature
– PA-OUT value of the FB2 after scaling
•
Additional Cyclic Value
– Additional cyclical value (depending on the source)
•
Free Place
– This module must be used if a value should not be used in the data telegram of the cyclical
data traffic (e.g. replacement of the temperature and Additional Cyclic Value)
A maximum of three modules can be active. By means of the configuration software of the Profibus
master you can determine the configuration of the cyclical data telegram with these modules. The
procedure depends on the respective configuration software.