Omron NX1P2 series User Manual page 43

Term
PDO communications
periodic task
PLC Function Module
POU
primary periodic task
process data communications
program
Range Specification
Retain
SDO communications
Servo Drive/encoder input slave
slave
slave and Unit configurations
Slave Terminal
Special Unit Setup
structure
synchronization
Sysmac Studio
system common processing
system service
system-defined variable
task
task period
NX-series NX1P2 CPU Unit Hardware User's Manual (W578)
An abbreviation for process data communications. Data is exchanged between the
master and slaves on a process data communications cycle. (The process data com-
munications cycle is the same as the task period of the primary periodic task.)
A task for which user program execution and I/O refreshing are performed each
period.
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.
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.
The task with the highest priority.
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.
Along with functions and function blocks, one of the three types of POUs.
Programs are assigned to tasks to execute them.
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.
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 power interruption
• When the CPU Unit changes to RUN mode
• When you specify to not initialize the values when the user program is transferred
One type of EtherCAT communications in which service data objects (SDOs) are
used to transmit information whenever required.
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.
A device that performs remote I/O for a master.
A generic term for the EtherCAT configuration and Unit configuration.
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.
A generic term for the settings for a Special Unit, including the settings in allocated
DM Area words.
One of the derivative data types. It consists of multiple data types placed together
into a layered structure.
A function that automatically compares the information in the NJ/NX-series Control-
ler with the information in the Sysmac Studio, displays any differences and loca-
tions in a hierarchical form, and can be used to synchronize the information.
A computer software application for setting, programming, debugging, and trouble-
shooting NJ/NX-series Controllers. It also provides operations for motion control
and a Simulator.
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 between
tasks, data trace processing, and other processing is performed.
Processing that is performed by the CPU Unit in unused time between task pro-
cessing. The system service includes communications processing, SD Memory
Card access processing, self-diagnosis processing, and other processing.
A variable for which all attributes are defined by the system and cannot be changed
by the user.
An attribute that defines when a program is executed.
The interval at which the primary periodic task or a periodic task is executed.
Description
Terminology
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