Terminology
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NJ-series CPU Unit Software User’s Manual (W501)
Retain One of the attributes of a variable. The values of variables with a Retain attribute
are held at the following times. (Variables without a Retain attribute are set to their
initial values.)
• When power is turned ON after a power interruption
• When the CPU Unit changes to RUN mode
• When you specify to not initialize the values when the user program is transferred
SDO communications One type of EtherCAT communications in which service data objects (SDOs) are
used to transmit information whenever required.
Servo Drive/encoder input slave Any of the EtherCAT slaves that is assigned to an axis. In the NJ-series System, it
would be a Servo Drive or Encoder Input Slave Unit.
slave A device that performs remote I/O for a master.
slave and Unit configurations A generic term for the EtherCAT configuration and Unit configuration.
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.
Special Unit Setup A generic term for the settings for a Special Unit, including the settings in allocated
DM Area words.
structure One of the derivative data types. It consists of multiple data types placed together
into a layered structure.
synchronization A function that automatically compares the information in the NJ-series Controller
with the information in the Sysmac Studio, displays any differences and locations in
a hierarchical form, and can be used to synchronize the information.
Sysmac Studio A computer software application for setting, programming, debugging, and trouble-
shooting NJ-series Controllers. It also provides operations for motion control and a
Simulator.
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 pro-
cessing. 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.
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.
union One of the derivative data types. It allows you to handle the same data as different
data types.
Unit A device that mounts to the CPU Rack or an Expansion Rack. In NJ-series manu-
als, it refers to CJ-series Units.
Unit configuration The configuration information for the Units that are set on the Sysmac Studio. This
information tells what Unit models are connected to the CPU Unit and where they
are connected.
upload To transfer data from the Controller to the Sysmac Studio with the synchronization
operation of the Sysmac Studio.
user program All of the programs in one project.
user-defined event One of the events in the NJ-series System. These events are defined by the user.
“User-defined events” is a generic term for user-defined errors and user-defined
information.
user-defined variable A variable for which all of the attributes are defined by the user and can be changed
by the user.
variable A representation of data, such as a numeric value or character string, that is used in
a user program.
You can change the value of a variable by assigned the required value. “Variable” is
used as opposed to “constant,” for which the value does not change.
variable memory A memory area that contains the present values of variables that do not have AT
specifications. It can be accessed only with variables without an AT attribute.
Term Description
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