VEGA VEGABAR 87 Profibus PA - Operating Instructions User Manual
Page 65
65
11 Supplement
VEGABAR 87 • Profibus PA
45047-EN-131107
software. By default, the sensor operates with the manufacturer-specific ID number. When using the
instruments on a segment coupler SK-2 or SK-3, no special GSD files are required.
Module of the PA sensors
For the cyclic data traffic, VEGABAR 87 provides the following modules:
•
AI FB1 (OUT)
– Out value of the AI FB1 after scaling
•
AI FB2 (OUT)
– Out value of the AI FB2 after scaling
•
AI FB3 (OUT)
– Out value of the AI FB3 after scaling
•
Free Place
– This module must be used if a value in the data telegram of the cyclical data traffic should not
be used (e.g. replacement of 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.
Note:
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
•
AI FB1 (OUT)
•
AI FB2 (OUT)
•
AI FB3 (OUT)
Byte-
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Format IEEE-754-Floating point
value
Status IEEE-754-Floating point
value
Status IEEE-754-Floating point
value
Status
Value
AI FB1 (OUT)
AI FB1
AI FB2 (OUT)
AI FB2
AI FB3 (OUT)
AI FB3
Example 2
•
AI FB1 (OUT)
•
Free Place
•
Free Place
Byte-No.
1
2
3
4
5
Format
IEEE-754-Floating point value
Status
Value
AI FB1 (OUT)
AI FB1
Note:
Bytes 6-15 are not used in this example.