DOC-0017-07-EN: AC20 Series - EtherCAT Option 
  DOC-0017-07-EN-B 04.04.2023   17 (58) 
Access the AC20 webserver by typing the IP-Address of the drive into the web browser. 
The drive must be in configuration state. Set the EtherCAT Option comms parameters as shown below. 
 
AC20 Webserver view when Master mapping is TRUE 
 
 
AC20 Webserver view when Master mapping is FALSE