Term Description
Axis Variable A system-defined variable that is defined as a structure and provides status information and
some of the axis parameters for an individual axis.
An Axis V
ariable is used to specify an axis for motion control instructions and to monitor the
command position, error information, and other information for the axis.
system common processing System processing that is performed by the CPU Unit to perform I/O refreshing and the user
program execution within a task. Exclusive control of variables between tasks, data trace
processing, and other processing is performed.
system service Processing that is performed by the CPU Unit in unused time between task processing. The
system service includes communications processing, SD Memory Card access processing,
self-diagnosis processing, and other processing.
system-defined variable A variable for which all attributes are defined by the system and cannot be changed by the
user
.
Initial V
alue One of the attributes of a variable. The variable is set to the initial value in the following situa-
tions.
• When power is turned ON
• When the CPU Unit changes to RUN mode
• When you specify to initialize the values when the user program is transferred
• When a major fault level Controller error occurs
slave A device that performs remote I/O for a master.
Slave Terminal A building-block remote I/O terminal to which a Communications Coupler Unit and NX Units
are mounted. A Slave Terminal is one type of slave.
slave and Unit configurations A generic term for the EtherCA
T configuration and Unit configuration.
absolute encoder home offset This data is used to restore in the CPU Unit the actual position of a Servo Drive with an ab-
solute encoder. The of
fset is the difference between the command position after homing and
the absolute data that is read from the absolute encoder.
project unit version A unit version to be set for the project. It is set for the project in the Select Device Area of the
Project Properties Dialog Box on the Sysmac Studio.
major fault level Controller error An error for which all NJ/NX-series Controller control operations stop. The CPU Unit immedi-
ately stops user program execution and turns OFF the loads for all slaves and Units (includ-
ing remote I/O).
download To transfer data from the Sysmac Studio to the Controller with the synchronization operation
of the Sysmac Studio.
task An attribute that defines when a program is executed.
task period The interval at which the primary periodic task or a periodic task is executed.
Communications Coupler Unit The generic name of an interface unit for remote I/O communications on a network between
NX Units and a host network master
. For example, an EtherCA
T Coupler Unit is a Communi-
cations Coupler Unit for an EtherCAT network.
periodic task A tasks for which user program execution and I/O refreshing are performed each period.
device A general term for any Unit or slave that is refreshed by the I/O refreshing that is performed
by the CPU Unit. Specifically, it refers to EtherCA
T slaves, NX Units on the CPU Unit, built-in
I/O, Option Boards, and CJ-series Units.
device output An output for any Unit or slave that is refreshed by the I/O refreshing that is performed by the
CPU Unit.
device variable A variable that is used to access a specific device through an I/O port.
synchronization A function that automatically compares the information in the NJ/NX-series Controller with
the information in the Sysmac Studio, displays any dif
ferences and locations in a hierarchical
form, and can be used to synchronize the information.
namespace A system that is used to group and nest the names of functions, function block definitions,
and data types.
Network Publish One of the attributes of a variable.
This attribute allows you to use CIP message communications or tag data links to read/write
variables from another Controller or from a host computer.
array specification One of the variable specifications. An array variable contains multiple elements of the same
data type. The elements in the array are specified by serial numbers called subscripts that
start from the beginning of the array.
Terminology
46
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
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