Omron CJ1W- ECT21, Operation Manual

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Terminology
26 CJ-series EtherCAT Slave Units Operation Manual (W541)
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 EtherCAT communications where only SDO
communications and reading input data from slaves
are possible. Outputs from slaves are not performed.
SDO communications --- One type of EtherCAT communications in which ser-
vice data objects (SDOs) are used to transmit informa-
tion whenever required.
service data object SDO CoE asynchronous mailbox communications where all
objects in the object dictionary can be read and writ-
ten.
Slave Information Interface SII Slave information that is stored in non-volatile memory
in the slave.
subindex --- Sub-address of an object within the object dictionary.
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 executed.
transmit PDO TxPDO A process data object sent from an EtherCAT slave.
Term Abbreviation Description