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Introduction 11.2 What is a Programmable Controller?FX0(S) FX0N FX FX(2C) FX2N(C)A Programmable Logic Controller (PLC or programmable controller) is a device that a user canprogram to perform a series or sequence of events. These events are triggered by stimuli(usually called inputs) received at the PLC or through delayed actions such as time delays orcounted occur-rences. Once an event triggers, it actuates in the outside world by switching ONor OFF electronic control gear or the physical actuation of devices. A programmable controllerwill continually ‘loop’ through its internal ‘user defined’ program waiting for inputs and givingoutputs at the programmed specific times.Note on terminology:The term programmable controller is a generic word used to bring all the elements making thecontrol system under one descriptive name. Sometimes engineers use the term‘Programmable Logic Controller’, ‘PLC’ or ‘programmable controller’ to describe the samecontrol system.The construction of a programmable controller can be broken down into component parts. Theelement where the program is loaded, stored and processed is often known as the MainProcessing Unit or MPU. Other terms commonly heard to describe this device are ‘base unit’,‘controller’ and ‘CPU’. The term CPU is a little misleading as todays more advanced productsmay contain local CPU devices. A Main CPU (or more correctly a Main Processing Unit)controls these local CPUs through a communication network or bus.1.3 What do You Need to Program a PLC?FX0(S) FX0N FX FX(2C) FX2N(C)A variety of tools are available to program the Mitsubishi FX family of PLCs. Each of thesetools can use and access the instructions and devices listed in this manual for the identifiedPLC.A6GPPFX-A6GPP-EE-KITFX,FX2CPersonal computerMelsec MEDOCMelsec Medoc PlusSW1PC-FXGPEEFX-PCS-WIN-EGP80GP-80FX-E-KITFX2N(C)Opto-isolatedRS232/RS422interfaceHPPFX-10P-EFX-20P-EFX0, FX0S,FX0N1-2