A-35
Appendices
NJ/NX-series CPU Unit Motion Control User’s Manual (W507)
A-6 Terminology
A
A-6-3 EtherCAT Communications
A-6-3 EtherCAT Communications
Term Description
CAN application protocol over Ether-
CAT(CoE)
A CAN application protocol service implemented on EtherCAT.
CAN in Automation(CiA) CiA is the international users’ and manufacturers’ group that develops and supports
higher-layer protocols.
EtherCAT Technology Group The ETG is a global organization in which OEM, End Users and Technology Provid-
ers join forces to support and promote the further technology development.
Object An abstract representation of a particular component within a device, which consists
of data, parameters, and methods.
Object Dictionary A data structure addressed by Index and Subindex that contains description of data
type objects, communications objects and application objects.
Process Data Collection of application objects designated to be transferred cyclically or acyclically
for the purpose of measurement and control.
Process Data Object A process data (I/O data) object that exchanges data at regular periods with CoE.
Service Data Object CoE asynchronous mailbox communications where all objects in the object dictionary
can be read and written.
Receive PDO A process data object received by an EtherCAT slave.
Transmit PDO A process data object sent from an EtherCAT slave.
Device Profile A collection of device dependent information and functionality providing consistency
between similar devices of the same device type.
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