AS-Interface
Appendix: AS-i Slave Lists and Data Telegrams
Subject to reasonable modifications due to technical advances.
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11.3
Structure of the Profibus-DP Data Telegram
11.3.1 Structure of the AS-i data window
with K = number of AS-i 1 (the AS-i flags are always additionally transmitted)
N = K/2
Bit allocation by slave 3 and slave 2 in byte 1
Bit allocation by slave (K-1) and slave (K-2) in byte (N-1)
The following AS-i Master flags are transmitted in the I/O field of the DP data telegram
in place of the input data of slave 0:
Bit 0 (Config_OK):
0 = configuration OK
1 = configuration error
Bit 1 (APF, AS-i power fail):
0 = power supply on AS-i sufficient
1 = power supply on AS-i insufficient
Bit 2 (Normal_operation_active):
0 = normal operation active
1 = normal operation not active
Bit 3 (Configuration_active):
0 = protected mode
1 = configuration mode
The following AS-i Master flags are transmitted in the I/O-field of the DP data telegram
in place of the output data of slave 0:
Bit 7:
Offline_Ready
off-line mode active
byte 0
...
byte N-1
slave 1 AS-i flags
...
slave(K-1) slave(K-2)
byte 1
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
slave 3
slave 2
D3
D2
D1
D0
D3
D2
D1
D0
byte (N-1)
bit 7
bit 6
bit 5
bit 4
bit 3
bit 2
bit 1
bit 0
slave (K-1)
slave (K-2))
D3
D2
D1
D0
D3
D2
D1
D0
If the AS-i flags shall not be used you have to make sure that these four
bits in the I/O-field are set to zero!
