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Terminology
CJ-series EtherCAT Slave Units Operation Manual (W541)
Terminology
Term Abbreviation Description
application layer status, AL 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 develops and supports higher-layer proto-
cols.
device profile --- A collection of device dependent information and func-
tionality providing consistency between similar devices
of the same device type.
device variable --- A variable in the NJ/NX-series CPU Unit to which pro-
cess data on an EtherCAT slave is allocated. Slave
process data is accessed by directly reading and writ-
ing device variables from user applications on the
NJ/NX-series CPU Unit.
EtherCAT slave controller ESC A controller for EtherCAT slave communications.
EtherCAT slave information ESI An XML file that contains setting information for an
EtherCAT slave.
EtherCAT state machine ESM An EtherCAT communications 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.
I/O map settings --- Settings that assign variables to I/O ports. Assignment
information between I/O ports and variables.
I/O port --- A logical interface that is used by the CPU Unit to
exchange data with an external device (slave or Unit).
I/O refreshing --- Cyclic data exchange with external devices that is per-
formed with predetermined memory addresses.
index --- Address of an object within an application process.
network configuration information --- The EtherCAT network configuration information held
by the EtherCAT master.
object --- An abstract representation of a particular component
within a device, which consists of data, parameters,
and methods.
object dictionary OD Data structure that contains description of data type
objects, communication objects and application
objects.
Operational --- A state in EtherCAT communications where SDO com-
munications and I/O are possible.
PDO communications --- An acronym for process data communications.
Pre-Operational --- A state in EtherCAT communications where only SDO
communications are possible with the slaves, i.e., no
I/O can be performed.
process data --- Collection of application objects designated to be
downloaded cyclically or acyclically for the purpose of
measurement and control.
process data communications --- One type of EtherCAT communications in which pro-
cess data objects (PDOs) are used to exchange infor-
mation cyclically and in realtime. This is also called
PDO communications.
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