Terminology Description
Controller The range of devices that are directly controlled by the CPU Unit.
In the NX-series System, the Controller includes the CPU Rack and EtherCAT
slaves (including general-purpose slaves and Servo Drives).
In the NJ-series System, the Controller includes the CPU Rack, Expansion
Racks, and EtherCA
T slaves (including general-purpose slaves and Servo
Drives).
Controller error Errors that are defined by the NJ/NX-series System.
“Controller error” is a collective term for major fault level, partial fault level, minor
fault level, and observation Controller events.
Controller event One of the events in the NJ/NX-series System. Controller events are errors and
information that are defined by the system for user notification. A Controller
event occurs when the system detects a factor that is defined as a Controller
event.
Controller information Information that is defined by the NJ/NX-series System that is not an error. It rep-
resents an information Controller event.
Servo Drive/encoder input slave Any of the EtherCAT slaves that is assigned to an axis. In the NJ/NX-series Sys-
tem, it would be a Servo Drive or Encoder Input Slave Unit.
axis A functional unit within the Motion Control Function Module. An axis is assigned
to the drive mechanism in an external Servo Drive or the sensing mechanism in
an external Encoder Input Slave Unit.
axes group A functional unit that groups together axes within the Motion Control Function
Module.
Axes Group Variable A system-defined variable that is defined as a structure and provides status in-
formation and some of the axes parameters for an individual axes group.
An Axes Group V
ariable is used to specify an axes group for motion control in-
structions and to monitor the command interpolation velocity
, error information,
and other information for the axes group.
Axis Variable A system-defined variable that is defined as a structure and provides status in-
formation and some of the axis parameters for an individual axis.
An Axis Variable 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 be-
tween tasks, data trace processing, and other processing is performed.
system service Processing that is performed by the CPU Unit in unused time between task proc-
essing. 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 situations.
• 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.
Terminology
47
NX-series NX502 CPU Unit Hardware User's Manual (W629)
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