WAGO I/O System 750
Process Image 31
750-482/000-001 2AI 4-20mA HART NAMUR NE43
Manual
Version 1.0.2
Table 18: Input Process Image or PROFIBUS Telegram “…6-Byte Mailbox”
PROFIBUS Telegram Input Process Image or Input Data
Offset
Byte Designation
Remark
0
S0
Status byte
1
Internal Use
Used internally
2
MBX_RES
Mailbox response data
3
4
5
6
7
8
AI0
Analog input data Channel 1
9
10
AI1
Analog input data Channel 2
11
Table 19: Output Process Image or PROFIBUS Telegram “…6-Byte Mailbox”
PROFIBUS Telegram Output Process Image or Output Data
Offset
Byte Designation
Remark
0
C0
Control byte
1
Internal Use
Used internally
2
MBX_REQ
Mailbox request data
3
4
5
6
7
8
-
Not used
9
10
11
Table 20: Control Byte C0
Control Byte C0
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
-
-
-
-
-
-
-
-
In the “6-Byte Mailbox” operating mode, only 1 common control byte is available
for both logical channels. For this reason, there is no more space in the status
byte to signal a wire break or short circuit. A short circuit or wire break is still
signaled by an under flow or overflow.
