Terminology
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NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
Terminology
Term Description
absolute encoder home offsets
This data is used to restore in the CPU Unit the actual position of a Servo Drive with
an absolute encoder. The offset is the difference between the command position
after homing and the absolute data that is read from the absolute encoder.
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.
AT One of the attributes of a variable.
This attribute allows the user to specify what is assigned to a variable. An I/O port
or an address in memory used for CJ-series Units can be specified.
axes groups A functional unit that groups together axes within the Motion Control Function Mod-
ule.
Axes Group Variable A system-defined variable that is defined as a structure and provides status infor-
mation and some of the axes parameters for an individual axes group.
An Axes Group Variable is used to specify an axes group for motion control instruc-
tions and to monitor the command interpolation velocity, error information, and
other information for the axes group.
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.
Axis Variable A system-defined variable that is defined as a structure and provides status infor-
mation 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.
basic data type Any of the data types that are defined by IEC 61131-3.
They include Boolean, bit string, integer, real, duration, date, time of day, date and
time, and text string data types.
“Basic data type” is used as opposed to derivative data types, which are defined by
the user.
cam data variable A variable that represents the cam data as a structure array.
A cam data variable is an array structure that consists of phases and displace-
ments.
CJ-series Unit Any of the CJ-series Units that can be used with an NJ-series Controller.
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 EtherCAT Coupler
Unit is a Communications Coupler Unit for an EtherCAT network.
Constant One of the attributes of a variable.
If you specify the Constant attribute for a variable, the value of the variable cannot
be written by any instructions, ST operators, or CIP message communications.
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 EtherCAT 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.
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