WAGO I/O-SYSTEM 750 Manual page 32

32 • I/O Modules
Special Modules
Table 10: Process data and register communication
The possible settings with regard to the overall process image and mailbox
size are explained in the following graphic.
Figure 9: Superimposition of the mailbox and register data on the process data
Process data communication
Mailbox switched on
Control /status
(1 byte long, from byte 0)
Used internally
(1 byte long, from byte 1)
Mailbox
(Acyclical data,
6...18 bytes long,
from byte 2 to n)
Process data
(Cyclical data,
0...32 bytes long,
from byte n + 1 to m)
(Pay attention to the valid-
ity of the data!)
0
Control/status byte
1
Reserved
2
3
4
5
6
7
8
9
Process data length
10
12 byte
11
12
13
14
15
16
17
18
19
20
21
Process data length
22
24 byte
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
Process data length
46
48 byte
47
Mailbox switched off
Control /status
(1 byte long, from byte 0)
Used internally
(1 byte long, from byte 1)
Process data
(Cyclical data,
0...32 bytes long,
from byte 2 to m)
Register data 2 byte
Mailbox
6 byte
Control/status = 0x20
Mailbox
12 byte
Control/status
Register Communication
Control /status
(1 byte long, from byte 0)
Used internally
(1 byte long, from byte 1)
Register data
(2 bytes long, from byte 2 to 3)
Invalid data
(from byte 4 to m)
Control/status = 0x80
= 0x20
Mailbox
18 byte
Control/status = 0x20
WAGO-I/O-SYSTEM 750
I/O Modules
g064408e