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The bright areas are the minimum parts of the telegram and they cannot be
changed. You can add as many IDs piecewise to the telegrams (depending upon
the set parameters) as needed in the current application.
Note:
Reading-writing in double words in S7 systems: please remember that the double
words cannot be read or written with the SFC14 and SFC15 function modules of
the S7 systems. Instead, use direct peripheral access.
Examples of telegrams
The following figure shows the basic structure of Profibus telegrams. The first line
is the telegram from the bus master to the controller and the second line is the
controller's reply.
Example 1: Data transmission without a text block and without variable
user-defined identifiers (ID)
Parameter settings:
Text block
number ID
Telegram master to the controllers.
FKB
bin. out
(2
bytes)
Reply of the controller
The commando telegram that changes manual tare for scale/group 1 and specifies
the first analog value of the analog function block:
FKB binary command
xx xx xx xx
The values for (control) commands
00 01 Taring on the scale displayed
00 02 Clear tare on the scale displayed
00 03 Zero setting on the scale displayed
DISOMAT Opus, Satus, Tersus, Data Communication
© Schenck Process
Commands
(2 bytes)
FKB bin
Status
in
Scale
displayed
(2
bytes)
(2 bytes)
value
xx xx
no
0
ID
Manual tare or
FKB analog
(2 bytes)
(4 bytes)
Mirror-ID
Scale showed
in this
gross
case: zero
(2 bytes)
(4 bytes)
ID manual tare1 value of manual tare 1
2000
42 10 00 00
BV-H2359GB/0902
5.3 Profibus DP protocol
ID
Manual tare or FKB
analog
(2 bytes)
(4 bytes)
Gross
Scale displayed
rounded off in the
display format
(4 bytes)
(2 bytes)
ID FKB1/1
200C
42 C8 00 00
75
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