BECKHOFF EtherCAT Technology Section I - Manual (Page 47)

Ethernet Physical Layer
Slave Controller – Technology I-27
Table 15: PHY Address configuration matches PHY address settings
Logical Port Configured address of the PHY PHY address register value
used by EtherCAT master
PHY address
offset = 0
PHY address
offset = 16
0 0 16 0
1 1 17 1
2 2 18 2
3 3 19 3
none 4-15 20-31 4-15
none 16-31 0-15 16-31
If the actual PHY address settings differ from the PHY address configuration of the ESC, the
EtherCAT master has to use the actual PHY address mapping, i.e., PHY addresses 1-4 for accessing
the PHYs of logical ports 0-3.
Table 16: PHY Address configuration does not match actual PHY address settings
Logical Port Configured
address of the
PHY
PHY address register value
used by EtherCAT master
0 1 1
1 2 2
2 3 3
3 4 4
none 0, 5-31 0, 5-13
NOTE: PHY address offset is 0 in this case (recommended).