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8
Command Interface
8.1
Construction
Command interface call-instructions are described as follows:
byte
1
2
3
...
36
byte
1
2
3
...
36
Command byte and T-bit are always part of the response. The T-bit is necessary
to operate the command interface.
Circuit = 0
Circuit = 1
The commands for reading and writinig exist in two variations. At the first variation
the bits in the slave lists are arranged as usually with Pepperl+Fuchs products:
Data for slave with lower address appear in the lower bits. The second variation is
compatible to Siemens masters: The sequence of the bits in the slave lists bytes
are inverse.
Switching between the two variations can be done with bit 2
quest. If it is deleted, the Pepperl+Fuchs arrangement is selected, otherwise the
Siemens compatible arrangement is selected.
The coding of requests for commands to reading and writing is following therefore:
byte
1
2
3
...
Subject to reasonable modifications due to technical advances.
Pepperl+Fuchs Group · Tel.: Germany (6 21) 7 76-0 · USA (3 30) 4 25 35 55 · Singapore 7 79 90 91 · Internet http://www.pepperl-fuchs.com
7
6
5
2
2
2
T
–
request parameter byte 34
7
6
5
2
2
2
T
response parameter byte 1
response parameter byte 34
If an AS-i gateway with one AS-i master or the master 1 of an AS-i
gateway with 2 masters should be chosen.
If master 2 of an AS-i gateway with 2 masters should be chosen.
7
6
5
2
2
2
T
0
Request parameter byte 1
AS-i EtherNet/IP Gateway
Request
4
3
2
2
command
circuit
request parameter byte 1
...
Response
4
3
2
2
command
result
...
Request
4
3
2
2
command
circuit
...
Command Interface
2
1
2
2
2
1
2
2
6
in byte 2 of the re-
2
1
2
2
Copyright Pepperl+Fuchs, Printed in Germany
0
2
0
2
0
2
55
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