Vega VEGAPULS 62 - Profibus PA Telegram Configuration; Telegram Configuration Examples; Output Signal Data Format

89
11 Supplement
VEGAPULS 62 • Probus PA
36505-EN-181127
•
Long for Probus master only supporting the "Identier Format" byte, e.g. Siemens
S7-300/400
Examplesoftelegramconguration
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
For-
mat
IEEE-754-Floating point
value
Sta-
tus
IEEE-754-Floating point
value
Sta-
tus
IEEE-754-Floating point
value
Sta-
tus
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.
Data format of the output signal
Byte4
Byte3
Byte2
Byte1
Byte0
Status Value (IEEE-754)
Fig. 59: Data format of the output signal
The status byte corresponds to prole 3.02 "Probus PA Prole 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 oating point number in the IEEE-754 format.
Byte n
Byte n+1
Bit
7
VZ
Exponent
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Bit
7
2
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Sign
Bit
Significant
7
65
4
3
21
0
-1
-2
-3
-4
-5
-6 -7
Byte n+2
Byte n+3
Bit
7
2
Significant
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Bit
7
2
Bit
6
2
Bit
5
2
Bit
4
2
Bit
3
2
Bit
2
2
Bit
1
2
Bit
0
2
Significant
-9
-10 -11
-12
-13
-14 -15
-16
-17
-18
-19
-20
-21
-22
-23
-8
Value = (-1)
VZ
2
(Exponent - 127)
(1 + Significant)
Fig. 60: Data format of the measured value