VEGA VEGAFLEX 66 (-110…+400°C) Profibus PA - Manual (Page 57)

l
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 telegram is structured.
Example 1 (standard setting) with distance value and additional cyclical value:
l
AI (PA-OUT)
l
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
Example 2 with distance value without additional cyclical value:
l
AI (PA-OUT)
l
Free Place
Byte-No. 1 2 3 4 5
Status
Status
(FB1)
IEEE-754-
Floating point value
PA-OUT
(FB1)
Format
Value
Data format of the output signal
Byte4 Byte3 Byte2 Byte1 Byte0
Status Value (IEEE-754)
Fig. 28: Data format of the output signal
The status byte corresponds to profile 3.0 "Profibus PA Profile for Process Control
Devices" coded. The status "Measured value OK" is coded as 80 (hex) (Bit7 = 1, Bit6 … 0
=
0).
The measured value is transferred as a 32 bit floating point number in the IEEE-754
format.
VEGAFLEX 66 • Profibus PA 57
10 Supplement
32764
-
EN
-080716