| AL | Application Layer |
| DC | Distributed Clock |
| DCM | Distributed Clock Management |
| DPRAM | DualPort RAM |
| EASII | Elmo Application Studio 2 |
| EC | EtherCAT |
| ENI | EtherCAT Network Information: This XML file describes the whole EtherCAT network. It further describes all information, that is transmitted by the the PDOs. |
| ESC | EtherCAT Slave Contorller |
| ESI | EtherCAT Slave Information: This XML file describes a certain slave type. The manufacturer of the slave should provide this file. It is necessary to create the ENI file. |
| ESM | EtherCAT State Machine |
| FMMU | Fieldbus Memory Management System |
| OD | Object Dictionary |
| PDO | Periodic Data Object: This frame is transmitted periodically (e.g. every millisecond) |
| PDI | Process Data Interface |
| SDO | Service Data Object |
