8.1 EtherCAT (CoE) Communications Settings8-3 Operation88.1 EtherCAT (CoE) Communications SettingsThis section describes the switch settings necessary for EtherCAT (CoE) communications.8.1.1 EtherCAT Secondary Address SettingsThe EtherCAT secondary address (Station Alias) can be used for identification or for addressing of a device.The station address is set using the rotary switches S1 and S2.(1) SettingsThe combination of the settings of rotary switches S1 and S2 determine the station alias number.Station alias number = (Setting of S1) × 16 + (Setting of S2)When you turn the power supply to the SERVOPACK OFF and back ON, the station alias number is set in theConfigured Station Alias Register of the EtherCAT slave controller (ESC).(2) General Identification Process during Start UpDuring start up the master detects the slaves by using the Auto Increment Addressing. The Identity object willbe read from the slave and compared with the values from the master's configuration (which was provided bythe EtherCAT configuration tool before). So the order of the slaves in the network has to be the same as in themaster's configuration. To allow a different network topology a Station Alias is defined.(3) Example ScenarioWith a machining center there might be two identical drives to work in X and Y direction. It might happen thatthe cabling order is mixed up after a device replacement. To avoid that the drives receive wrong process data,an explicit address of the device is used with a Station Alias.(4) Identification of Devices with Station AliasThe master reads the Station Alias by using the Auto Increment Addressing. The detected Station Alias will becompared with the values from the master's configuration to get the relation of the network topology and theconfigured topology.8.1.2 EtherCAT (CoE) CommandsFor information on the EtherCAT (CoE) commands, refer toΣ-V-SD series User’s Manual For Command Pro-file EtherCAT (CoE) Communications Reference (manual no.: SIEP S800000 95).Rotary switch (S1)Rotary switch (S2)Manufacturer adjustment connector (CN55)DIP switch (S3)SERVOPACKPanel Display• Always keep the DIP switch pins (S3) set to OFF.• Do not use connector CN55 (manufacturer adjustment connector).
