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Terminology
NX-series NX1P2 CPU Unit Hardware User’s Manual (W578)
CPU Unit The Unit that serves as the center of control for a Machine Automation Controller.
The CPU Unit executes tasks, refreshes I/O for other Units and slaves, etc. The
NJ/NX-series CPU Units include NX701-, NJ501-, NJ301-,
NX1P2-.
derivative data type A data type that is defined by the user. Structures, unions, and enumerations are
derivative data types.
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 EtherCAT 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 per-
formed by the CPU Unit.
device variable A variable that is used to access a specific device through an I/O port.
download To transfer data from the Sysmac Studio to the Controller with the synchronization
operation of the Sysmac Studio.
edge One of the attributes of a variable.
This attribute makes a BOOL variable pass TRUE to a function block when the vari-
able changes from FALSE to TRUE or when it changes from TRUE to FALSE.
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.
EtherCAT Master Function Module One of the function modules. This function module controls the EtherCAT slaves as
the EtherCAT master.
EtherNet/IP Function Module One of the function modules. This function module controls the built-in EtherNet/IP
port.
event log A function that recognizes and records errors and other events.
Event Setup Settings that define user-defined errors and user-defined information.
event task A task that executes a user program only once when the task execution conditions
are met.
FB An acronym for “function block.”
forced refreshing Forcing the refreshing of an input from an external device or an output to an exter-
nal device, e.g., when the user debugs a program.
Addresses that are subject to forced refreshing can still be overwritten from the
user program.
FUN An abbreviation for “function.”
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.
function module One of the functional units of the software configuration of the CPU Unit.
general-purpose slave Any of the EtherCAT slaves that cannot be assigned to an axis.
global variable A variable that can be read or written from all POUs (programs, functions, and func-
tion blocks).
I/O map settings Settings that assign variables to I/O ports. Assignment information between I/O
ports and variables.
I/O port A logical interface that is used by the CPU Unit to exchange data with an external
device (slave or Unit).
I/O refreshing
Cyclic data exchange with external devices that is performed with predetermined
memory addresses.
information One of the event levels for Controller events or user-defined events. These are not
errors, but appear in the event log to notify the user of specific information.
Term Description
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