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Terminology
NX-series Communications Interface Units User’s Manual (W540)
Terminology
Term
Abbre-
viation
Description
application layer status, AL status --- Status for indicating information on errors that occur in an application on
a slave.
CAN ap
plication 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.
Communications Coupler Units --- The generic name of an interface unit for remote I/O communications on
a network between NX Units and a host network master.
CPU Rack --- A rack to which a CPU Unit is mounted. For NX-series CPU Unit
s to
which NX Units can be connected, a CPU Rack has a CPU Unit with NX
Units and an End Cover mounted to it.
DC time --- In a CPU Rack of a NX-series CPU Unit to which NX Units can be con-
nected, time indicated by the clock shared
between the CPU Unit and
the NX Units.
EtherCAT slaves that support distributed clo
ck synchronization have a
clock that is shared by all slaves in the network. The time that is based
on this distributed clock is called the DC time. The same clock is shared
by a CPU Unit, NX Units connected to the CPU Unit, and applicable Eth-
erCAT slaves.
device profile --- A collection of device dependent information
a
nd functionality providing
consistency between similar devices of the same device type.
device variable --- A variable that is used to access a specific device through an I/O port by
an NJ/NX-series CPU Unit or NY-series Industrial PC. Process data on
an EtherCAT slave is allocated to this variable. For NX-series CPU Units
to which NX Units can be connected, I/O data for the NX Units on a CPU
Unit is allocated. A user application on a CPU Unit or Industrial PC
accesses a device that can be connected, by directly reading and writing
this device variable.
distributed clock DC Clock distribution mechanism used to synchronize EtherCAT slaves and
the
E
therCAT master.
divided data size --- The size of data that is sent/received in one cycle
if the send/receive
data is divided into pieces and sent/received over multiple cycles.
EtherCAT slave controller ESC A controller for EtherCAT slave communications.
EtherCAT slave information ESI An XML file that contains setting info
rmation 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 technol-
ogy 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 NJ/NX-se
ries CPU Unit or
NY-series Industrial PC to exchange data with an external device (slave
or Unit).
I/O refreshing --- Cyclic data exchange with external devices
that is performed with prede-
termined memory addresses.
index --- Address of an object within an application process.
network configuration information --- The EtherCAT network configuration information held by the EtherCAT
master.