Vega VEGAPULS 63 Operating Instructions Manual page 60

10 Supplement
•
AI (PA-OUT)
– PA-OUT value of the FB1 after scaling
•
Additional Cyclic Value
– Additional cyclical value (depending on the source)
•
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)
Max. two 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:
•
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 distance value and additional cyclical value:
•
AI (PA-OUT)
•
Additional Cyclic Value
Byte-No.
1 2
Format IEEE-754-
Floating point value
PA-OUT
Value
(FB1)
Example 2 with distance value without additional cyclical value:
•
AI (PA-OUT)
•
Free Place
Byte-No.
1 2
IEEE-754-
Format
Floating point value
PA-OUT
Value
(FB1)
Note:
Data format of the output signal
Byte2 Byte1 Byte0
Byte4 Byte3
Status Value (IEEE-754)
Fig. 39: 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).
60
The modules are available in two versions:
3 4 5 6
Status
Floating point value
Status
(FB1)
3 4 5
Status
Status
(FB1)
Bytes 6-10 are not used in this example.
7 8 9
IEEE-754- Status
Additional Cyclic Status
Value
10
VEGAPULS 63 • Profibus PA