VEGA VEGABAR 51 Profibus PA - Manual (Page 56)

56
10 Supplement
VEGABAR 51 • Profibus PA
36714-EN-130321
PROFIBUS PA-output
Target
Mode
Failure
mode
Alarms Scaling
Source for
scaling
t
i
Damping
Sensor
characteristics
PA-Out
°C
TB
FB 2
Fig. 29: VEGABAR 51: Block diagram with temperature value
Module of the PA sensors
For the cyclic data traffic, VEGABAR 51 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.
Tip:
The modules are available in two versions:
•
Short for Profibus master supporting only one "Identifier Format" byte, e.g. Allen
Bradley
•
Long for Profibus master only supporting the "Identifier Format" byte, e.g. Siemens
S7-300/400
Examples of telegram configuration
In the following you will see how the modules can be combined and how the appendant data tel-
egram is structured.
Example 1 (standard setting) with pressure value, temperature value and additional cyclical value:
•
AI (PA-OUT)
•
Temperature
•
Additional Cyclic Value
Byte-No. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
Format
Value
IEEE-754-
Floating point value
PA-OUT
(FB1)
Status
Status
(FB1)
IEEE-754-
Floating point value
Temperature
(FB2)
IEEE-754-
Floating point value
Additional Cyclic
Value
Status
Status
(FB2)
Status
Status
Fig. 30: Telegram configuration example 1
Example 2 with pressure value and temperature value without additional cyclical value: