WAGO 750-830 Manual page 273

AS-interface Master Module
750-655
The length of the process image of the AS-interface master module can be set
to fixed sizes of 12, 20, 24, 32, 40 or 48 bytes.
It consists of a control or status byte, a mailbox with a size of 0, 6, 10, 12 or
18 bytes and the AS-interface process data, which can range from 0 to 32
bytes.
The AS-interface master module has a total of 6 to maximally 24 words data
in both the Input and Output Process Image. Word alignment is applied.
The first Input and output word, which is assigned to an AS-interface master
module, contains the status / control byte and one empty byte.
Subsequently the mailbox data are mapped, when the mailbox is permanently
superimposed (Mode 1).
In the operating mode with suppressible mailbox (Mode 2), the mailbox and
the cyclical process data are mapped next.
The following words contain the remaining process data.
WAGO-I/O-SYSTEM 750
BACnet/IP Controller
Byte Destination
Offset
High Byte
0 -
1 D1
2 D3
3 D5
... ...
max. 23 D45
Process Data Architecture for MODBUS/TCP
Input and Output Process Image
Low Byte
C0/S0
D0
D2
D4
...
D44
I/O Modules
Remark
not used Control/Status
Mailbox (0, 3, 5, 6 or 9 words) /
Process data (0-16 words)
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byte