Omron NX-ID User Manual page 33

Term
Operational
PDO communications
Pre-Operational
primary periodic task
process data
process data communications
process data object
receive PDO
Safe-Operational
SDO communications
service data object
Slave Information Interface
Slave Terminal
subindex
Sync0
Sync Manager
task period
transmit PDO
NX-series Digital I/O Unit User's Manual (W521)
Abbre-
viation
--- A state in EtherCAT communications where SDO communications and
I/O are possible.
--- An acronym for process data communications.
--- A state in EtherCAT communications where only SDO communications
are possible with the slaves, i.e., no I/O can be performed.
--- The task with the highest priority.
--- Collection of application objects designated to be downloaded cyclically
or acyclically for the purpose of measurement and control.
--- One type of EtherCAT communications in which process data objects
(PDOs) are used to exchange information cyclically and in realtime. This
is also called PDO communications.
PDO A structure that describes the mappings of parameters that have one or
more process data entities.
RxPDO A process data object received by an EtherCAT slave.
--- A state in EtherCAT communications where only SDO communications
and reading input data from slaves are possible. Outputs from slaves are
not performed.
--- One type of EtherCAT communications in which service data objects
(SDOs) are used to transmit information whenever required.
SDO CoE asynchronous mailbox communications where all objects in the
object dictionary can be read and written.
SII Slave information that is stored in non-volatile memory in the slave.
--- A building-block remote I/O terminal to which a Communications Cou-
pler Unit and NX Units are mounted
--- Sub-address of an object within the object dictionary.
--- 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.
SM Collection of control elements to coordinate access to concurrently used
objects.
--- The interval at which the primary periodic task or a periodic task is exe-
cuted.
TxPDO A process data object sent from an EtherCAT slave.
Terminology
Description
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