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The engineering tool TwinCAT provides already predefined ADS services in the form of function
blocks or function libraries For further information, please refer to the corresponding documentation
29.1 AMS NetID
The AMS NetID ensures clear identification of the EtherCat slave and is provided by the engineering tool
29.2 Port number
The port number ensures clear identification of the IO_Link master and its ports The following definition
applies
Value (hex)
1000
1001
1008
29.3 AoE services
As for the CoE, the index group of an ADS command is defined with F302
channel
The addressing of the IO-Link ISDU object is coded with index and subindex in the AoE IndexOffset The
following table gives an overview
CoE service
AoE ser-
vice
SDO upload
Read
SDO
Write
download
30 EtherCat emergency messages
Emergency messages are messages that are actively sent from the device to the EtherCat master in case of
certain events/problems It is an unacknowledged service based on CoE
The signalling takes place via messages that are specified in ETG10006
Structure of an emergency message
CoE emergency message
2 bytes
1 bytes
Error code
Error register
Description
IO-Link master
Port 1
Port 8
AoE port
AoE In-
dexGroup
EtherCAT
F302
Slave address
(NetID+PortNr)
EtherCAT
F302
Slave address
(NetID+PortNr)
5 bytes
Diagnostic data
for the IO-Link parameter
hex
AoE IndexOffset
Bit
Description
hex
16 31
ISDU-Index
8
0
0 7
ISDU-Subindex
Bit
Description
hex
16 31
ISDU-Index
8
0
ISDU subindex
IO-Link Master EtherCat
AoE data
Response:
read data
Response:
data to be
written
63
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