Terminology
32
NX-series Communications Interface Units User’s Manual (W540)
no-protocol communications --- With no-protocol communications, data is sent and received without any
conversions. Communications protocols to perform retry processing,
data type conversion processing, branch processing according to the
receive data, and other processing are not used.
NX bus --- The NX-series internal bus.
object --- An abstract representation of a particul
a
r component within a device,
which consists of data, parameters, and methods.
object dictionary OD Data structure that contains description of data type objects, communi-
cation objects and application objects.
Operational --- A state in which I/O refresh communications and NX message communi-
cations are possible between the communications master and the Com-
munications Coupler Unit or NX Units.
PDO communications --- An acronym for process data communications.
Pre-Operational --- A state in which NX message communications are possible between the
communicatio
ns master and the Communications Coupler Unit or NX
Units, but I/O refresh communications are not possible.
primary periodic task --- The task with the highest priority.
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 process data objects
(PDOs) ar
e used to exchange information cyclically and in realtime. This
is also called PDO communications.
process data object PDO A structure that describes the mappings of p
arameters that have one or
more process data entities.
receive data --- The data that is received by the Controller from the serial line.
receive PDO RxPDO A process data object received by an EtherCAT slave.
receiving data --- Receiving data from the serial line at the Controller.
Safe-Operational --- A state in which input refresh communications and NX message commu-
nications are possible between the commu
nications master and the
Communications Coupler Unit or NX Units, but output refresh communi-
cations are not possible.
SDO communications --- One type of EtherCAT communications in which service data objects
(SDOs) are used
to transmit information whenever required.
send data --- The data that is sent fr
om the Controller to the serial line.
sending data --- Sending data from the Controller to the serial line.
serial line monitor --- A function that displays and saves the log of the
data that has been sent
or received by the Communications Interface Unit.
service data object SDO CoE asynchronous mailbox communications where all objects in the
object di
ctionary can be read and written.
Slave Information Interface SII Slave information that is stored in non-volatile memory in the slave.
Slave Terminal --- A building-block remote I/O terminal to which a Communications Cou-
pler Unit and NX Units are mounted
subindex --- Sub-address of an object within the
object dictionary.
Sync0 --- A signal that gives the interrupt timing based on the distributed clock
(DC) in Ethe
rCAT communications. The slaves execute controls accord-
ing to this interrupt timing.
Sync Manager SM Collection of control elements to coordi
nate access
to concurrently used
objects.
task period --- The interval at which the primary periodic task or a periodic task is exe-
cuted.
transmission buffering --- With transmission buffering, the Communications Interface Unit first
stores the divided send data in a send buffer inside the Unit. When all of
the send data has been received, the Communications Interface Unit
sends all of it at the same time on the serial line.
transmit PDO TxPDO
A process data object sent from an EtherCAT slave.
Term
Abbre-
viation
Description
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