he timer is most commonly used PLC instruction. Timers set the output to 1 at specific time intervals which is called preset time. when input of timer condition is true than timer start running until preset value reached. Output coil represent the timer in a program .

Mitsubishi GX Developer is PLC programming and configuration software developed by Mitsubishi. GX Developer support Q series, L series, QnA series, A series (including the motion controller (SCPU)) and FX series, with their setting operations common, and is abbreviated to GPPA.

Mitsubishi PLC Programming A Program consists sequence of instructions with Device name and address. Specific device is identified by its address. we know that controller have multiple input and output and each input and out have deferent address. where instructions perform a specific operation like counter are used for counting bit increment/decrement, arithmetic instructions perform addition subtraction, multiplication or other mathematics operation.

Mitsubishi FXCPU have some special relay and register devices which are very useful for programming a Controller. these relay and register use full only for special purpose. in this article we discuss only special relay which are used in FXCPU. each special relay have reserved address you can't use special register address in general programming.

Mitsubishi Special Register Devices are used for error identification, plc information and error, relay and data register handling etc. these register have predefined address for use, you can use these address if register in program. we know data register are used to store numerical value but special register are used for diagnostic

arithmetic instructions perform mathematical operation and calculation on numerical data. Arithmetic Instructions are very useful in industrial control system. Mitsubishi fx series cpu have ability to perform mathematical instruction.

A program is a connected series of instructions written in a language that the PLC can understand. There are three forms of program format; instruction, ladder and SFC/STL. Not all programming tools can work in all programming forms.

Mitsubishi FX Series INPUT Contact Instructions are And, OR, ANI, LDP, LDF etc. these are input contact very useful for bit device. you can use these Input contact instruction which have only two state ON and OFF like limit switch, Push button, Proximity switch,

A Counter count input bit generally we have a two type of counter up counter which is a incremental counter it increment current value of counter when input bit is set to ON. Second counter is decrement counter it decrement value by 1 when input bit is changed from off to ON. another counter is up/down counter,

the International Standard IEC61131-3. Structured text language have operators, control syntaxes and functions. Structured Text is high-level programming language like c++, c# etc.The Structured Text Language help to solve a complex process programming. Mitsubishi PLC also supports Structured text., the ST language can describe control with control syntaxes such as conditional statement-

Data types stored or hold are used to store value in a assigned memory space. type of value is depend which type of data type is used for example Bool data type only store true or false or 0 or 1 similarly INT data type store numerical value.

Mitsubishi PLC GX Works 2 is software developed by Mitsubishi for Mitsubishi PLC and controller. Mitsubishi GX works 2 use for configuration, programming, monitoring, communication settings, debugging of Mitsubishi PLC. this software is not free to use. GX works 2 support ladder programming, structure text, instruction list, sfc and FBD for pro

Mitsubishi PLC Comparison Instruction is used to compare two value. Comparison Instructions are equal to, greater than, less than greater than or equal to. in comparison instruction generally have two value S1 and S2, Data value of S2 is compared with data value S1

in structured text you can declare timer as function after declaration of timer declare enable timer input, timer coil number and preset value of timer. in structured text The timer preset value can be specified within the range 0 to 32767. for preset value you can use constant val

operator in structured text are symbol that represent specific operation. Generally in structured text operators like arithmetic operator, Comparison Operators, logical operator, bitwise operator and assignment operator. each operator Have specific symbol for example + is symbol for Addition.