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Terminology
NX-series EtherCAT Coupler Unit User’s Manual (W519)
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 service data objects
(SDOs) are used to transmit information whenever required.
service data object SDO CoE asynchronous mailbox communications where all objects in the
object dictionary 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.
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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