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207-D533-NN User Manual
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4.
EtherCAT Basic Information
4.1
Symbols and Abbreviations
Abbreviation
Term
Description
AL
AL-layer
EtherCAT Application Layer Service
CiA
CAN in Automation
A non-profit organization established in 1992 as a joint venture
between companies to provide CAN technical information, product
information, and marketing information.
CAN
Controller Area Network
Communications protocol for the physical layer and data link layer
established for automotive LANs. It was established as an
international standard as ISO 11898.
CANopen
CANopen
An upper-layer protocol based on the international CAN standard (EN
50325-4). It consists of profile specifications for the application layer,
communications, applications, devices, and interfaces.
CoE
CANopen over EtherCAT
A network that uses Ethernet for the physical layer, EtherCAT for the
data link layer, and CANopen for the application layer in a seven-
layer OSI reference model.
DC
Distributed Clocks
A clock distribution mechanism that is used to synchronize
the EtherCAT slaves with the EtherCAT master.
EEPROM
Electrically Erasable
Programmable Read Only
Memory
A ROM that can be electrically overwritten.
ESC
EtherCAT Slave Controller
A hardware chip that processes EtherCAT communications
(such as loopbacks) and manages the distributed clock.
ESM
EtherCAT State Machine
A state machine in which the state of EtherCAT (the data link
layer) changes according to transition conditions.
ETG
EtherCAT Technology
Group
An international organization established in 2003 to provide
support for developing EtherCAT technologies and to promote
the spread of EtherCAT technologies.
EtherCAT
Ethernet for Control
Automation Technology
An open network developed by Beckhoff Automation.
FMMU
Fieldbus Memory
Management Unit
A unit that manages fieldbus memory.
INIT
INIT
The Init state in the EtherCAT state machine.
OD
Object Dictionary
A group of objects and structure supported by an EtherCAT
SERVOPACK.
