VEGA VEGABAR 66 Profibus PA - Manual (Page 62)

62
10 Supplement
VEGABAR 66 • Profibus PA
36739-EN-130321
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. 35: Telegram configuration example 1
Example 2 with pressure value and temperature value without additional cyclical value:
•
AI (PA-OUT)
•
Temperature
•
Free Place
Byte-No. 1 2 3 4 5 6 7 8 9 10
Format
Value
IEEE-754-
Floating point value
PA-OUT
(FB1)
Status
Status
(FB1)
IEEE-754-
Floating point value
Temperature
(FB2)
Status
Status
(FB2)
Fig. 36: Telegram configuration example 2
Example 3 with pressure value and additional cyclical value without temperature value:
•
AI (PA-OUT)
•
Free Place
•
Additional Cyclic Value
Byte-No. 1 2 3 4 5 6 7 8 9 10
Status
Status
Status
Status
(FB1)
IEEE-754-
Floating point value
PA-OUT
(FB1)
IEEE-754-
Floating point value
Additional Cyclic
Value
Format
Value
Fig. 37: Telegram configuration example 3
Data format of the output signal
Byte4 Byte3 Byte2 Byte1 Byte0
Status Value (IEEE-754)
Fig. 38: Data format of the output signal