112 Appendix
WAGO-I/O-SYSTEM
750
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
A few rules must be followed during fragmentation:
When switching on fragmentation, the minimum size for a segment is 2
bytes (for one direction) or 1 byte (for the other direction).
When switching on fragmentation, 1 byte is always required for control
information in both data directions.
The SIO byte should untouched in terms of its offset and length, i.e.
OFFSET = 24, length = 8.
The Mailbox cannot be changed in its position and length. It always
occupies byte 1 and 2 n the internal bus process image (for both data
directions).
The segments may no overlap.
The sum of all segment lengths (for both data directions) must be smaller
than the data width available on the internal bus. The control/status byte
and 2 bytes for the Mailbox are to be included.
The SEGMENT_MODE byte has the value "0x00" by default and the following
structure:
Table 90: SEGMENT_MODE, Data structure
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 0 0 0
FRAG_
PORT4
FRAG_
PORT3
FRAG_
PORT2
FRAG_
PORT1
The following table describes the individual bits.
Table 91: SEGMENT_MODE, Description
Bit
Value Description
0
Fragmentation for data segments (IN, OUT) for port 1 OFF.
FRAG_PORT1
1
Fragmentation for data segments (IN, OUT) for port 1 ON.
0
Fragmentation for data segments (IN, OUT) for port 2 OFF.
FRAG_PORT2
1
Fragmentation for data segments (IN, OUT) for port 2 ON.
0
Fragmentation for data segments (IN, OUT) for port 3 OFF.
FRAG_PORT3
1
Fragmentation for data segments (IN, OUT) for port 3 ON.
0
Fragmentation for data segments (IN, OUT) for port 4 OFF.
FRAG_PORT4
1
Fragmentation for data segments (IN, OUT) for port 4 ON.
