Chapter 1 Introduction
1-4
1.3 Terminology
Here describes the terminology used in this user’s manual.
Terminology Definition Remarks
Module
A device like I/O board assembled to insert in a motherboard or
base as a standardized factor having the regular function to
configure the system.
Ex)
CPU module,
power module,
I/O module etc.
Unit
A module or module aggregate which is the minimum unit in
operation of PLC system. It configures the PLC system by
connecting to other module or module aggregate.
Ex)
Basic unit,
Extended unit
PLC System
A system consisted of PLC and peripherals and which is
configured to enable the control by user program
XG 5000
Graphic loader to carry out program writing, editing and debug
function
I/O image area
Internal memory area of CPU module installed to maintain the
input and output state
Rnet Remote Network (Remote dedicated network)
Fnet Field bus Network
RAPIEnet Real-time Automation Protocols for Industrial Ethernet
Cnet Computer Network
FEnet Fast Ethernet Network
Pnet Profibus-DP Network
Dnet DeviceNet Network
RTC
Real Time Clock. A general name of universal IC having the
clock function
Watchdog Timer
A timer to monitor the assigned running time of program and give
an alarm if failed to complete the processing within the assigned
time.
Task
There are three kind of tasks. (cycle time task, internal device
task, external device task by external interrupt module’s input
signal)
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