AS-i/PROFIBUS Gateway PROFIBUS-DP
Subject to reasonable modifications due to technical advances Copyright Bihl+Wiedemann, Printed in Germany
Bihl+Wiedemann GmbH · D-68199 Mannheim · Phone +49-621-339960 · Fax +49-621-3392239 · Internet http://www.bihl-wiedemann.de
issue date 7.1.2002
58
Analog data
The 16 bit values of AS-i slaves according to the profile 7.3 can read and written
within each PROFIBUS cycle or via the mailbox.
If analog values are written cyclic and acyclic via the mailbox or via DPV1 at the
same time, the values transmitted cyclically will overwrite the acyclic values.
AS-i analog data 7.3 may be mapped in a separate area to provide easy access.
Mailbox
Only using the IDs of the process data field the AS-i/PROFIBUS gateway can be
used as M0 AS-i master. Using the mailbox (see chapter 8.1) the functions of a M3
master are avaiable.
A mailbox command will be treated if the toggle bit T has changed. In that way the
same command can be used many times.
The mailbox commands can also be activated with PROFIBUS-DP V1. Even the
process data exchange is possible via the mailbox. In that way the configuration
software "AS-i Control Tools" can run the whole communication via DP V1.
Analog data
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 slave 31-n/8, channel 1, high byte
2 slave 31-n/8, channel 1, low byte
3 slave 31-n/8, channel 2, high byte
4 slave 31-n/8, channel 2, low byte
……
n-1 slave 31, channel 4, high byte
n slave 31, channel 4, low byte
Request
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1command
2T circuit
3 request parameter byte 1
……
36 request parameter byte 34
Answer
byte
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
1 command (mirrored)
2T result
3 response parameter byte 1
……
34 response parameter byte 32
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