A-33
Appendices
NJ/NX-series CPU Unit Built-in EtherCAT Port User’s Manual (W505)
A-4 Glossary
A
A-4 Glossary
Use the following list of EtherCAT terms for reference.
Term
Abbrevia-
tion
Description
AL status (application layer status) − Status for indicating information on errors that occur in an application
on a slave.
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 devel-
ops and supports higher-layer protocols.
device profile − Collection of device dependent information and functionality provid-
ing consistency between similar devices of the same device type.
device variables − Variables in the NJ/NX-series CPU Unit to which process data on
EtherCAT slaves are allocated. Slave process data is accessed by
directly reading and writing these device variables from user applica-
tions on the NJ/NX-series CPU Unit.
distributed clocks DC Clock distribution mechanism used to synchronize EtherCAT Slave
Units and the EtherCAT Master Units.
EtherCAT Master Function Module − One of the function modules. This module controls the EtherCAT
slaves as the EtherCAT master.
EtherCAT slave controller ESC A controller for EtherCAT slave communication.
EtherCAT slave information ESI An XML file that contains setting information for an EtherCAT Slave
Unit.
EtherCAT state machine ESM An EtherCAT communication state machine.
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.
index − Address of an object within an application process.
network configuration information − The EtherCAT network configuration information held by the Ether-
CAT master.
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 applica-
tion objects.
Operational − A state in EtherCAT communications where SDO communications
and I/O are possible.
packet monitoring − A function that enables the EtherCAT master to capture packets flow-
ing over an EtherCAT line and store them in the master. You can start
and stop capturing packets from the Sysmac Studio or with EtherCAT
communications instructions.
PDO communications − An acronym for process data communications.
Pre-operational − A state in EtherCAT communications where only SDO communica-
tions are possible without being able to perform I/O.
process data − Collection of application objects designated to be downloaded cycli-
cally or acyclically for the purpose of measurement and control.
process data communications − One type of EtherCAT communications that uses process data
objects (PDOs) to exchange information in realtime with a fixed
cycle. This is also called PDO communications.
process data object PDO Structure described by mapping parameters containing one or sev-
eral process data entities.
receive PDO RxPDO A process data object received by an EtherCAT Slave Unit.
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