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Text block
number ID
The text block is always set in front of the other data.
Telegram of master to the controller
Text header
Text-user data
4 bytes
4 bytes
Reply of the controller
Text header
Text-user data
4 Byte
4 bytes
Text transmission via Profibus DP
All explanations in this chapter relate to the 4-byte text block and the same applies
correspondingly to the 20-byte text block. It only differs in the number of text-user
data that can be transmitted per cycle.
Text header
AK
Text-ID
Figure 3 The basic structure of the text block
The meaning of the byte in the text header
AK
The first byte contains the order or reply identifier
Refer to the table further below for details.
Text-ID
The second byte contains the text identifier (1-5) that specifies the text to be transmitted in greater
detail.
Refer to the Text-ID table for details.
AKT
AKT specifies the current index value in texts that cannot be transmitted in one cycle.
If you select short (4-byte) text, this gives you the sequence 0,4,8,... for the index value.
If you select long (20-byte) text, this gives you the sequence 0,20,40,... for the Index Value.
Important: AKT has to accept the value of MAX at the end of the text transmission for least one
telegram cycle. This indicates to the controller that all text segments were transmitted and that the
text should now be accepted in the controller.
MAX
The byte always contains the total length of the text user data in bytes.
DISOMAT Opus, Satus, Tersus, Data Communication
© Schenck Process
4-byte text block (not with DISOMAT Satus)
0
FKB PLS-DIn
Commands
(2 bytes)
(2 bytes)
FKB PLS-
The status on
Dout
the scale
displayed
(2 bytes)
(2 bytes)
AKT
MAX
BV-H2359GB/0902
ID
Manual tare or
FKB analog
(2
bytes)
(4 bytes)
Mirror-ID
Gross
in this case:
on the scale
ZERO
displayed
(2 bytes)
(4 bytes)
Text-user data
As much as 4- or 20-byte text-user data
(unused bytes should filled with zero)
5.3 Profibus DP protocol
ID
Manual tare
or FKB
analog
(2 bytes)
(4 bytes)
Gross
The scale
displayed in the
display format
rounded
4 bytes)
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