WAGO-I/O-SYSTEM 750
Appendix
83
750-657 IO-Link Master
Manual
Version 1.0.2, valid from FW/HW-Version 02/01
11.1.2
Communication via Acyclic Services
The IO-Link master has two different I/O module-specific services via the acyclic
channel of "Mailbox 2.0" for parameters and diagnosis:
1.
Parameter access service "IOL_CALL":
Access to the various data areas in the master or access to the data of the IO-
Link devices.
2.
Diagnostic service "IOL_DIAG":
Diagnostic messages of the I/O module
Figure 32: Communication via Acyclic Services
IOL_CALL
acyclic
IOL_PD
cyclic
IOL_DIAG
acyclic
IO-Link master
IOL-M Basic
IOL-M Port
I&M 0..4
IOL-M Directory
Command Register
Master parameter
Process image
Port 1-4
IO-Link
Gerät 1
ISDU*
Geräte-PA
Geräte-
diagnose
Diagnosis
IO-Link master/
IO-Link device
Port 1-4
Port 1-4
Port 1-4
Port 0-4
IO-Link
device 1
ISDU*
Device PI
Device
diagnosis
* “Indexed Service Data Unit“, see section
"Parameter Access via ISDU"