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AS-i 3.0 PROFIBUS Gateway in Stainless Steel
PROFIBUS DP
10.1.3.2 AS-i 16-bit data
Information!
A-slaves map the data on channels 1 and 2.
B-slaves map the data on channels 3 and 4.
In addition to the access via the command interfaces, the 16-bit data for or by the
slaves with 16-bit value can by exchanged cyclically (profile 7.3., S-7.4, S-6.0, S-
7.5, S-7.A.8, S-7.A.9, S-7.A.A). Competing writing access attempts on analog
output data will not be blocked by each other. If analog data for a particular slave
are being transmitted both cyclically and acyclically with the command interface
or via DP/V1 connections, the acyclically transmitted values will be overwritten by
the cyclically transmitted values.
AS-i 16-bit data can be transmitted in a reserved data area. Therefore accessing
analog data is as easy as accessing digital data.
16-bit data
byte
2
1
2
3
4
...
n-3
n-2
n-1
n
10.1.3.3 Command interface
Only using the IDs of the process data field the PROFIBUS gateway can be used
as M0 AS-i master. By using the command interface (see chap. <DP/V1>) the
functions of a M3 master become available.
Request
byte
2
1
2
T
3
7
6
5
2
2
slave 31-n/8, channel 1, high byte
slave 31-n/8, channel 1, low byte
slave 31-n/8, channel 2, high byte
slave 31-n/8, channel 2, low byte
slave 31, channel 3/slave 31B, channel 1, high byte
slave 31, channel 3/slave 31B, channel 1, low byte
slave 31, channel 4/slave 31B, channel 2, high byte
slave 31, channel 4/slave 31B, channel 2, low byte
7
6
5
2
2
request parameter byte 1
4
3
2
2
2
2
...
4
3
2
2
2
2
command
circuit
1
0
2
2
Tab. 10-23.
1
0
2
2
53
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