Term Description
derivative data type A data type that is defined by the user. Structures, unions, and enumerations are derivative
data types.
Range Specification One of the variable specifications. You can specify a range for a variable in advance. The
variable can take only values that are in the specified range.
general-purpose slave Any of the EtherCAT slaves that cannot be assigned to an axis.
function A POU that is used to create an object that determines a unique output for the same input,
such as for data processing.
function block A POU that is used to create an object that can have a different output for the same input,
such as for a timer or counter
.
partial fault level Controller error An error for which all of the control operations for one of the function modules in the NJ/NX-
series Controller stop.
An NJ/NX-series CPU Unit continues operation even after a partial fault level Controller error.
primary periodic task The task with the highest priority
.
program Along with functions and function blocks, one of the three types of POUs.
Programs are assigned to tasks to execute them.
process data communications One type of EtherCAT communications in which process data objects (PDOs) are used to
exchange information cyclically and in realtime. Process data communications are also
called PDO communications.
variable A representation of data, such as a numeric value or character string, that is used in a user
program.
Y
ou 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 specifica-
tions. It can be accessed only with variables without an AT attribute.
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
instruction The smallest unit of the processing elements that are provided by OMRON for use in POU
algorithms.
There are ladder diagram instructions (program inputs and outputs), function instructions,
function block instructions, and ST statements.
main memory The memory inside the CPU Unit that is used by the CPU Unit to execute the OS and user
program.
Motion Control Function Module One of the function modules. The MC Function Module performs motion control based on
commands from the motion control instructions that are executed in the user program.
motion control instruction A function block instruction that executes motion control.
The Motion Control Function Module supports instructions that are based on function blocks
for PLCopen
®
motion control as well as instructions developed specifically for the Motion
Control Function Module.
user-defined event One of the events in the NJ/NX-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
.
user program All of the programs in one project.
Unit A device that mounts to the CPU Rack or an Expansion Rack.
Unit configuration The configuration information for the Units that are set on the Sysmac Studio. This informa-
tion tells what Unit models are connected to the CPU Unit and where they are connected.
literal A constant expression that is used in a user program.
enumeration One of the derivative data types. This data type takes one item from a prepared name list of
enumerators as its value.
enumerator One of the values that an enumeration can take expressed as a character string.
The value of an enumeration is one of the enumerators.
Terminology
47
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
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