Terminology
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NJ-series CPU Unit Hardware User’s Manual (W500)
local variable A variable that can be accessed only from inside the POU in which it is defined.
“Local variable” is used as opposed to “global variable.”
Local variables include internal variables, input variables, output variables, in-out
variables, and external variables.
main memory The memory inside the CPU Unit that is used by the CPU Unit to execute the OS
and user program.
major fault level Controller error An error for which all NJ-series Controller control operations stop. The CPU Unit
immediately stops user program execution and turns OFF the loads for all slaves
and Units (including remote I/O).
MC Test Run A function to check motor operation and wiring from the Sysmac Studio.
memory used for CJ-series units One type of I/O memory in an NX1P2 CPU Unit and NJ-series CPU Unit. It contains
addresses that can be directly specified by the user.
It can be accessed only with variables with an AT attribute. This memory is used to
access CJ-series Units and CJ-series networks. However, you cannot connect the
CJ-series Units to the NX1P2 CPU Units.
minor fault level Controller error An error for which part of the control operations for one of the function modules in
the NJ-series Controller stop.
An NJ-series CPU Unit continues operation even after a minor fault level Controller
error occurs.
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 func-
tion blocks for PLCopen
®
motion control as well as instructions developed specifi-
cally for the Motion Control Function Module.
namespace A system that is used to group and nest the names of functions, function block defi-
nitions, and data types.
Network Publish One of the attributes of a variable.
This attribute allows you to use CIP message communications or tag data links to
read/write variables from another Controller or from a host computer.
NX bus The NX-series internal bus. An NX1P2 CPU Unit has the NX bus.
NX Units Any of the NX-series Units that perform I/O processing with connected external
devices. The Communications Coupler Units are not included with the NX Units.
observation One of the event levels for Controller events or user-defined events.
These are minor errors that do not affect control operations, but appear in the event
log to notify the user of specific information.
partial fault level Controller error An error for which all of the control operations for one of the function modules in the
NJ-series Controller stop.
An NJ-series CPU Unit continues operation even after a partial fault level Controller
error.
PDO communications An abbreviation for process data communications. Data is exchanged between the
master and slaves on a process data communications cycle. (The process data
communications cycle is the same as the task period of the primary periodic task.)
periodic task A tasks for which user program execution and I/O refreshing are performed each
period.
PLC Function Module One of the function modules. This function module executes the user program,
sends commands to the Motion Control Function Module, and provides an interface
to the USB and SD Memory Card.
POU An acronym for "program organization unit." A POU is a unit in a program execution
model that is defined in IEC 61131-3.
A POU contains an algorithm and a local variable table and forms the basic unit
used to build a user program.
There are three types of POUs: programs, functions, and function blocks.
primary periodic task The task with the highest priority.
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 communica-
tions are also called PDO communications.
Term Description
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