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 application protocol over Ether-
CA
T
CoE A CAN application protocol service implemented on EtherCA
T.
CAN in Automation CiA CiA is the international users' and manufacturers' group that develops
and supports higher-layer protocols.
CPU Rack --- A rack to which a CPU Unit is mounted. For NX-series CPU Units 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. EtherCA
T slaves that support distributed clock synchroni-
zation 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 EtherCA
T slaves.
EtherCA
T 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 tech-
nology providers join forces to support and promote the further technol-
ogy development.
I/O port --- A logical interface that is used by the NJ/NX-series CPU Unit or NY-
series Industrial PC to exchange data with an external device (slave or
Unit).
I/O map settings --- Settings that assign variables to I/O ports. Assignment information be-
tween I/O ports and variables.
I/O refreshing --- Cyclic data exchange with external devices that is performed with pre-
determined memory addresses.
NX bus --- The NX-series internal bus.
NX message communications --- Message communications to access NX objects.
PDO communications --- An acronym for process data communications.
SDO communications --- One type of EtherCAT communications in which service data objects
(SDOs) are used to transmit information whenever required.
Slave Information Interface SII Slave information that is stored in non-volatile memory in the slave.
Sync0 --- A signal that gives the interrupt timing based on the distributed clock
(DC) in EtherCA
T communications. The slaves execute controls ac-
cording to this interrupt timing.
Analog Input Time Stamp ---
The DC time at which AD conversion starts in the first sampling of ana-
log input data during each task period in an NX-series High-speed Ana-
log Input Unit. The timing of starting the AD conversion is the same for
all channels.
index --- Address of an object within an application process.
object --- An abstract representation of a particular component within a device,
which consists of data, parameters, and methods.
Terminology
35
NX-series Analog I/O Units User’s Manual for High-speed Analog Input Units (W592)
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