WAGO-I/O-SYSTEM 750
Process Image
35
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
6.2
Mailbox
Modules with mailbox functionality have an acyclic communication channel
(mailbox) in the process image. The "Mailbox 2.0" transmission method is
hereinafter abbreviated as "Mailbox".
If the Mailbox is active (control byte, bit 7 = 0), it is used to transfer
configuration, parameterization and diagnostic data. Byte 1 and byte 2 of the
internal bus process image are used by default. A Mailbox size of 2 bytes is
permitted for FW/HW version 02/01.
More information about the "Mailbox 2.0 Transmission Method" is available in
the respective section in the appendix.
6.3
SIO Byte
"SIO" is an abbreviation for "Standard Input/Output". The SIO byte is used in the
IO-Link operating mode in SIO mode (input only), as well as in the "DI" and
"DO" operating modes to transfer data to and from digital inputs or outputs to and
from the control.
The following table provides an overview of the SIO byte.
Table 15: SIO Byte
SIO byte
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
0
0 SIO3 SIO2 SIO1 SIO0
0
Process data of digital port 4: logical '0'
SIO3
1
Process data of digital port 4: logical '1'
0
Process data of digital port 3: logical '0'
SIO2
1
Process data of digital port 3: logical '1'
0
Process data of digital port 2: logical '0'
SIO1
1
Process data of digital port 2: logical '1'
0
Process data of digital port 1: logical '0'
SIO0
1
Process data of digital port 1: logical '1'
Input data:
In the IO-Link operating mode in SIO mode and in the "DI" operating mode, the
status of the associated channel always appears in the SIO byte.
In the "IO-Link" operating mode, the LSB of the process data of the associated
channel appears independent of the IO-Link device type. The display is redundant
to the data in the associated process data segment.
Corresponding SIO bits always zero during fragmentation!
If you have switched on fragmentation of the process data, the corresponding bit
is always zero on the SIO byte.
