Omron NX-ILM400, User Manual

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Terminology
NX-series IO-Link Master Unit User’s Manual (W567)
Terminology
The following table describes terms used for NX Units. Refer to the IO-Link System User’s Manual (Cat.
No. W570) for information on terms used for IO-Link Master Units.
Term
Abbre-
viation
Description
CAN application protocol over Ether-
CAT CoE A CAN application protocol service implemented on EtherCAT.
Communications Coupler Units --- The generic name of an interface unit for remote I/O communications on
a network between NX Units and a host network master.
CPU Rack --- A Rack with a CPU Unit mounted on it. With an NX-series NX1P2 CPU
Unit, NX Units are mounted to the CPU Unit and End Covers are
mounted on it.
device profile --- A collection of device dependent information and functionality providing
consistency between similar devices of the same device type.
device variable --- A variable that is used by an NX-series CPU Unit or an NY-series Indus-
trial PC to access a specific device through an I/O port. EtherCAT slave
process data is assigned to these variables. With an NX-series NX1P2
CPU Unit, the I/O data is assigned to NX Units in the CPU Unit. Con-
nectable devices are accessed by directly reading and writing device
variables from user applications on the CPU Unit or Industrial PC.
distributed clock DC Clock distribution mechanism used to synchronize EtherCAT slaves and
the EtherCAT master.
EtherCAT slave information ESI An XML file that contains setting information for an EtherCAT slave.
I/O map settings --- Settings that assign variables to I/O ports. Assignment information
between I/O ports and variables.
I/O port --- A logical interface that is used by the NX-series CPU Unit or NY-series
Industrial PC to exchange data with an external device (slave or Unit).
I/O refreshing --- Cyclic data exchange with external devices that is performed with prede-
termined memory addresses.
index --- Address of an object within an application process.
network configuration information --- The EtherCAT network configuration information held by the EtherCAT
master.
NX bus --- The NX-series internal bus.
object --- An abstract representation of a particular component within a device,
which consists of data, parameters, and methods.
object dictionary OD Data structure that contains description of data type objects, communi-
cation objects and application objects.
Operational --- A state in EtherCAT communications where SDO communications and
I/O are possible.
PDO communications --- An acronym for process data communications.
Pre-Operational --- A state in EtherCAT communications where only SDO communications
are possible with the slaves, i.e., no I/O can be performed.
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 EtherCAT 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.
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.