Ethercat Terminology - Omron R88M-K User Manual

Appendices
A-4

EtherCAT Terminology

Use the following list of EtherCAT terms for reference.
Term
object
object dictionary
service data object
index
subindex
process data
process data object
Receive PDO
Transmit PDO
sync manager
distributed clock
device profile
fieldbus memory management unit
physical device internal interface
CAN in Automation
CAN application protocol over
EtherCAT
EEPROM
EtherCAT Technology Group
EtherCAT slave controller
EtherCAT state machine
EtherCAT slave information
Slave Information Interface
Power Drive System
A-168
Abbreviati
on
−
Abstract representation of a particular component within a
device, which consists of data, parameters, and methods.
OD Data structure addressed by Index and Subindex that contains
description of data type objects, communication objects and
application objects.
SDO CoE asynchronous mailbox communications where all objects
in the object dictionary can be read and written.
−
Address of an object within an application process.
−
Sub-address of an object within the object dictionary.
−
Collection of application objects designated to be transferred
cyclically or acyclically for the purpose of measurement and
control.
PDO Structure described by mapping parameters containing one or
several process data entities.
RxPDO A process data object received by an EtherCAT slave.
TxPDO A process data object sent from an EtherCAT slave.
SM Collection of control elements to coordinate access to
concurrently used objects.
DC Method to synchronize slaves and maintain a global time
base.
−
Collection of device dependent information and functionality
providing consistency between similar devices of the same
device type.
FMMU Single element of the fieldbus memory management unit: one
correspondence between a coherent logical address space
and a coherent physical memory location.
PDI A series of elements to access data link services from the
application layer.
CiA CiA is the international users' and manufacturers' group that
develops and supports higher-layer protocols.
CoE A CAN application protocol service implemented on EtherCAT.
EEPROM Electrically erasable PROM.
ETG The ETG is a global organization in which OEM, End Users
and Technology Providers join forces to support and promote
the further technology development.
ESC A controller for EtherCAT slave communication.
ESM An EtherCAT communication state machine.
ESI An XML file that contains setting information for an EtherCAT
slave.
SII Slave information stored in the nonvolatile memory of each
slave.
PDS A power drive system consisting of a Servo Drive, an inverter,
and other components.
G5-series AC Servomotors and Servo Drives User's Manual (with Built-in EtherCAT Communications)
Description