Omron Sysmac NX-TBX01, User Manual, Page: 31 / 172

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Terminology
NX-series System Units User’s Manual (W523)
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
communications 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 NX bus communications in which process data objects
(PDOs) are 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 parameters that have one or
more process data entities.
receive PDO RxPDO A process data object received by an EtherCAT slave.
Safe-Operational --- A state in which input refresh communications and NX message commu-
nications are possible between the communications master and the
Communications Coupler Unit or NX Units, but output refresh communi-
cations are not possible.
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 NX object within the object dictionary.
Sync0 --- A signal that gives the interrupt timing based on the distributed clock
(DC) in EtherCAT communications. The slaves execute controls accord-
ing to this interrupt timing.
Sync Manager SM Collection of control elements to coordinate access to concurrently used
objects.
task period --- The interval at which the primary periodic task or a periodic task is exe-
cuted.
transmit PDO TxPDO A process data object sent from an EtherCAT slave.
Term
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Description