90 Appendix
WAGO-I/O-SYSTEM
750
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
11.1.2.1.1.3 Control/State
The communication mechanisms of an "IOL_CALL" runs according to the
request/response operation.
The data byte is always "CONTROL" for communication from the control to the
I/O module. The CONTROL byte used for this purposes has the following
structure:
Table 51: IOL_CALL, CONTROL data structure
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0 CONTROL
Table 52: IOL_CALL, CONTROL data structure, description
Bit field
Wert
Description
0
Cancel /Release IOL_CALL
1 IDLE
sequence
2 Write
request
3 Read
request
CONTROL
4…255 Reserved
The data byte is always "STATE" for communication from the I/O module to the
control. The STATE byte used for this purposes has the following structure:
Table 53: IOL_CALL, Control data structure
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
IOL_ERROR_
PDU
0 0 0 0 0 STATE
Table 54: STATE, Description
Bit field
Value
Description
0
Data transfer completed
1 IDLE
sequence
2…127 Reserved
128 IOL
error
PDU
STATE
128...255 Reserved
0 No
Error
IOL_
ERROR_PDU
1 Error
If the I/O module returns an "IOL_Error_PDU" as the response, extended error
information can be taken from the other four bites ("IOL-M_error_code" (2
bytes), "IOL-D_error_code" and "IOL-D_(add)_error_code"), see section "Error
Messages".
