Omron NJ101-10 Series, User Manual

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A-5 Terminology
Use the following list of EtherCAT terms for reference.
Term
Abbrevia-
tion
Description
AL status --- Status for indicating information on errors that occur in an application on
a slave.
CAN in Automation CiA CiA is the international users' and manufacturers' group that develops
and supports higher-layer protocols.
CAN application protocol over
EtherCAT CoE A CAN application protocol service implemented on EtherCAT.
EtherCAT slave controller ESC A controller for EtherCAT slave communication.
EtherCAT state machine ESM An EtherCAT communication state machine.
EtherCAT slave information ESI An XML file that contains setting information for an EtherCAT slave.
EtherCAT Master Function Mod-
ule --- One of the function modules. This module controls the EtherCAT slaves
as the EtherCAT master.
EtherCAT Technology Group ETG The ETG is a global organization in which OEM, End Users and Tech-
nology Providers join forces to support and promote the further technol-
ogy development.
PDO communications --- An acronym for process data communications.
SDO communications --- One type of EtherCAT communications that uses service data objects
(SDOs) for communicating information when required.
Slave Imformation Interface SII Slave information that is stored in non-volatile memory in the slave.
WireShark --- Freeware for monitoring and capturing packets.
index --- Address of an object within an application process.
object --- An abstract representation of a particular component within a device,
which consists of data, parameters, and methods.
object dictionary OD A data structure addressed by Index and Subindex that contains de-
scription of data type objects, communications objects and application
objects.
Operational --- A state in EtherCAT communications where SDO communications and
I/O are possible.
service data object SDO CoE asynchronous mailbox communications where all objects in the ob-
ject dictionary can be read and written.
subindex --- Sub-address of an object within the object dictionary.
system-defined variable --- A variable in the NJ/NX-series CPU Unit for providing information such
as the EtherCAT communications status and error status. Status infor-
mation about EtherCAT communications is obtained by reading system-
defined variables from user applications in the NJ/NX-series CPU Unit.
receive PDO RxPDO A process data object received by an EtherCAT slave.
sync manager SM Collection of control elements to coordinate access to concurrently used
objects.
slave disconnection --- A state where an EtherCAT slave does not existed from the network
due to the following causes.
•
Cable disconnection
•
Slave power interruption
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.
Appendices
A-33
NJ/NX-series CPU Unit Built-in EtherCAT Port User's Manual (W505)
A-5 T
erminology
A