BECKHOFF CX51x0 - Manual (Page 75)

Commissioning/Configuration
The interruption is indicated by "LNK_MIS C" at coupler EK1100.
The EtherCAT ring is expandable. The number of devices in the ring is controlled by licenses: up to 250, up
to 1000, more than 1000. A master is only able to bridge one failure. In the event of two failures the ring
components will continue to run up to the breaking points.
CX51x0 75 Version 1.0