Define operating mode and topology

Before making the choice of SFP, it must be clear whether the CU1521-0020 converts/branches an EtherCAT line or is used as an Ethernet media converter.

Use case

Operation mode

Active ports

Important consequence

Convert or branch EtherCAT line via fiber optic cable

EtherCAT mode

X1, X2 and X3 according to rotary switch position

X3 only supports 100 Mbit remote stations; select SFPs on X1/X2 to match the remote station.

Implement Ethernet connection via SFP

Ethernet mode

X1 and X3

Device works as a 2-port media converter with store-and-forward and link loss forwarding.

Define operating mode and topology 1:

Decision support

If an EtherCAT topology is implemented, read Putting EtherCAT mode into operation. If only one Ethernet line is implemented between RJ45 and SFP, read Putting Ethernet mode into operation.