A-3 Terminology - Omron NJ501-1400 User Manual

A-3 Terminology
This appendix provides definitions of terms related to motion control.
A-3-1 NJ-series Controller
Term
main memory
periodic task
primary periodic task
period of tasks
I/O Refresh
program
user program
Inline ST
system-defined variables
global variable
local variable
download
upload
major fault level Control error
partial fault level Controller error
minor fault level Controller error
observation
NJ-series CPU Unit Motion Control User's Manual (W507)
The memory inside the CPU Unit that is used by the CPU Unit to execute the OS
and user program.
Tasks for which user program execution and I/O refreshing are performed each
period.
The task with the highest priority.
The interval at which the primary periodic task or a periodic task is executed.
Cyclic data exchange with external devices that is performed with predetermined
memory addresses.
One of three POUs. The others are functions and function blocks. Programs are
assigned to tasks to execute them.
All of the programs in one project.
ST programming that is included within a ladder diagram program.
A variable for which all attributes are defined by the system and cannot be
changed by the user.
Reading and writing global variables are possible from all POUs (programs,
functions, and function blocks).
A variable that can be accessed only from the POU in which it is defined. Local
variables include internal variables, input variables, output variables, in-out vari-
ables, and external variables.
To transfer data from the Sysmac Studio to the Controller, e.g., with the synchro-
nization operation of the Sysmac Studio.
To transfer data from the Controller to the Sysmac Studio, e.g., with the synchro-
nization operation of the Sysmac Studio.
An error for which all control operations from the NJ-series Controller are not
possible. The CPU Unit stops user program execution immediately and turns
OFF the loads for all slaves and Units (including remote I/O).
An error for which all control operations for one of the function modules in the
NJ-series Controller are stopped. The NJ-series CPU Unit continues operation
even after a partial fault level Controller error occurs.
An error for which some of the control operations for one of the function modules
in the NJ-series Controller are stopped. The NJ-series CPU Unit continues oper-
ation even after a minor fault level Controller error occurs.
One of the event levels for Controller information and user-defined information.
Observations represent minor errors that do not affect operation. They are
recorded in an event log to inform the use.
Description
Appendices
A-15