BECKHOFF EP9128 - Manual (Page 15)

Basic functioin principles
Fig. 9: Online topology
An error is now generated by disconnecting the connection between the upper RJ45 socket (X1) and the
EL3102 device. Within a few µs the ESC in the EK1122 detects the lost link and automatically closes the
affected port. This has the effect that the next incoming EtherCAT telegram is immediately forwarded to port
D (port 3) and the EL4732. The link is therefore missing and the System Manager indicates this in the online
display, see Fig. 6.
EP9128 15 Version 2.1.0