Omron GRT1-ECT SmartSlice, Руководство по эксплуатации

Страница: 114 / 142

A1 Appendix EtherCAT Terminology
A1 - 2 GRT1-series EtherCAT Communication Unit - Operation Manual
A1-1 EtherCAT Terminology
Use the following list of EtherCAT terms for reference.
Term
Abbrevia-
tion
Description
object
−
Abstract representation of a particular component within a device,
which consists of data, parameters, and methods.
object dictionary OD
Data structure addressed by Index and Sub-index that contains
description of data type objects, communication objects and
application objects.
service data object SDO
CoE asynchronous mailbox communication where all objects in the
object dictionary can be read and written.
index − Address of an object within an application process.
subindex
−
Sub-address of an object within the object dictionary.
Process data −
Collection of application objects designated to be transferred
cyclically or acyclically for the purpose of measurement and control.
Process data object PDO
Structure described by mapping parameters containing one or
several process data entities.
Receive PDO RxPDO A process data object received by an EtherCAT Slave.
Transmit PDO TxPDO A process data object sent from an EtherCAT Slave.
sync manager SM
Collection of control elements to coordinate access to concurrently
used objects.
distributed clock DC
Clock distribution mechanism used to synchronize EtherCAT Slaves
and the EtherCAT Master Units.
device profile −
Collection of device dependent information and functionality
providing consistency between similar devices of the same device
type.
fieldbus memory management unit FMMU
Function which establishes single or multiple communication
between logical address and physical memory
physical device internal interface PDI
A series of elements to access data link services from the application
layer.
CAN in Automation CiA
CiA is the international users' and manufacturers' group that
develops and supports higher-layer protocols.
CAN application protocol over
EtherCAT
CoE A CAN application protocol service implemented on EtherCAT.
EEPROM EEPROM Electrically erasable PROM. (Writable ROM)
EtherCAT Technology Group 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.
EtherCAT slave controller ESC A controller for EtherCAT slave communication.
EtherCAT state machine ESM An EtherCAT communication state machine.
EtherCAT slave information ESI An XML file that contains setting information for an EtherCAT Slave.