Siemens S7-300/S7-400 with STEP 7 Course Modules (module 1-4)

Siemens S7-300/400 (Modules 1-4)
Course Outline
Module 1
This module provides an overview of the Siemens S7-300 system. The training demo is introduced, as well as hardware and system components used in a typical SIMATIC Step 7 system. Step 7 software is reviewed and students will set the PG interface. Configuring hardware is next and then students will receive insights into determining a module’s status. Memory concepts are covered along with how to create symbols and monitor/modify them with a variable access table. To complete the module the student will be able to use and interpret the bit logic instruction in ladder logic and statement list.
 Lessons
    Introduction to the Demo
    System Overview
    Step 7 Software
    Setting the PG I/F
   Configuring Hardware
   Module Status
   Memory Layout
   Symbols
   VAT Table
   Bit Logic Instructions
Module 2
This module begins with a review of the numbering systems used in PLC’s and then students will learn about accumulator memory; the basic instructions used to move values. Timer and counter instructions for the S7-300 and S7-400 families are covered. Next, data blocks are covered including how to address, edit, create and view in a VAT table. To conclude the student will learn to configure the clock memory byte in Step 7.
Lessons
  Numbering Systems
  Load and Transfer Instructions
  Timers
  Counters
  Data Blocks
  Clock Byte
Module 3
This module will give the student the tools that they need to be able to use OB Blocks including an overview, priority, startup, cyclic, asynchronous and synchronous blocks. Next, math and compare operations using STL programming are covered. The student will learn how to use Function Calls, Function Blocks and how to monitor a specific instance of a FC or FB block called multiple times in a program. To complete the module the student will understand the various types of jump operations that are possible in STL and the operation of the Label instruction.
Lessons
   OB Blocks
   Math Operations
   Functions
   Compare Operations
   Function Blocks
   Monitor With Path
   Jump Instructions
Module 4
This module will review Analog I/O and introduce I/O used on PROFIBUS. The student will then go on to Searching, Reference Data, Block Compare and Forcing. To complete the module a review of troubleshooting skills and Common Step 7 Tasks.
Lessons
  Analog I/O
  Profibus DP
  Searching
  Reference Data
  Compare Blocks
  Forcing
  Troubleshooting
  Common Tasks

(source : http://www.automationtraining.ca/siemens.asp)

ASCII and Modbus Instructions DL06 PLC

The PLC of DL06 supports some easy to utilize instructions, which let strings of ASCII to be interpret into or written from the ports of communication when utilizing either the CPU port 2, or the port 2 of Module D0-DCM Data Communications.

Raw ASCII: Port 2 of CPU/DCM can be utilized for either writing or reading raw strings of ASCII.

Embedded ASCII: you can utilize the PLC of DL06 to place strings of ASCII embedded within a supported protocol through CPU/DCM Port with these instructions.

Receiving strings of ASCII
1. ASCII IN (AIN) - This command organizes Port 2 of CPU/DCM for raw strings of ASCII input, with parameters for example set and variable length strings of ASCII, byte swapping options, termination characters, and control bits of instruction. Use weigh scales barcode scanners, , etc., to write raw strings of ASCII input into Port 2 of CPU/DCM based on the parameters of AIN instruction.

2. Write embedded strings of ASCII straight to V-memory from an HMI external. The string of ASCII is sent out via Port 2 of CPU/DCM with any supported communications protocol. This technique applies the familiar instructions of RX/WX before available.

3. If the DL06 is applied as a network master, the RX (Network Read instruction) can be utilized to interpret embedded data of ASCII from a slave device network. Again, the string of ASCII would be sent out via Port 2 of CPU/DCM, with any supported protocol of communications.

Writing strings of ASCII
1. PRINTV (Print from V-memory) - utilize this instruction to write raw strings of ASCII out of port 2 of CPU/DCM to a panel of display, serial printer, etc. The instruction attributes the beginning address of V-memory, byte swapping options, string length, etc., the string is written to Port 2 of CPU/DCM when the permissive bit of instruction is enabled.

2. VPRINT (Print to V-memory) - apply this instruction to make pre-coded strings of ASCII in the PLC. The message is filled into a pre-defined address location of V-memory when the permissive bit of instruction is enabled. After that the instruction of PRINTV may be utilized to write the pre-coded string of ASCII out Port 2of CPU/DCM.

3. PRINT (Print Message) - This presented instruction can be applied to make pre-coded strings of ASCII in the PLC. The string is written to Port 2 of CPU/DCM when the permissive bit of instruction is enabled. The instruction combination of VPRINT/PRINTV is more flexible and greater than the instruction of PRINT.

4. The WX (Network Write) can be exercised to write embedded data of ASCII to an slave device or HMI directly from V-memory if the DL06 PLC is a master network.

More instructions of ASCII
• AFIND (ASCII Find) - Finds where a particular segment of the string of ASCII is placed in constant addresses of V-memory.
• AEX (ASCII Extract) - takes out a particular portion from the ASCII discover position or other recognized data location of ASCII.
• CMPV (Compare V-memory) - This teaching is applied to evaluate two Vmemory blocks addresses and is frequently utilized to identify a change in a string of ASCII.
• SWAPB (Swap Bytes) – exchanges bytes of V-memory on data of ASCII that was written straightforwardly to V-memory from an HMI external or related master device through a protocol of communications. The instructions of AIN and AEX have a integrated byte swap attribute. The option module of F0-CP128 is also offered for more general communications of ASCII.

DL06 Modbus RTU instructions
The port 2 of DL06 CPU/DCM supports instructions of Modbus Read/Write that make simpler setup. The instructions of MRX and MWX let you to utilize native addressing of Modbus, reducing the need for conversions of octal to decimal. Codes 05 and 06 function and the capability to interpret Slave Exception Codes have been included. These flexible instructions permit the user to choose the below parameters within one window of instruction:
• Modbus data type of 484, 584, or 984
• 0-247Slave node
• Code of Function
• Starting memory address of master/slave
• Bits Number

DL06Power Budgeting
The DL06 has 4 alternative slots of module. You will require executing a calculation of power budget to decide whether the modules combination you choose will have enough power.

Power is given from two sources: the power supply internal base unit and an external supply. The AC powered of D0-06xx PLCs supply an inadequate amount of 24 VDC power. The output of 24 VDC can be utilized to external devices of power.

Initiate by deciding the power supplied by the base unit for power budgeting. All the PLCs of DL06 supply the same 5 VDC power amount. Only the units AC recommends 24 VDC supporting power. The 5 VDC power amount available depends on the 24 VDC power amounts being exploited, and the 24 VDC power amount offered depends on the 5 VDC power amount consumed.
(source : program-plc.blogspot.com)

PLC Model and Types

When talking about PLC model or types, there’s a vague questions about it, anyway. The PLC machines or models are available in various designs, models, brands, and also shapes. Even the seemingly similar PLC computer is different when people look at the internal parts – whether it’s the input, the output, and other parts. There is no exact answer when it comes to the exact types of PLC model. When talking about the PLC model, there’re several possible kinds with several examples products.

PLC Model and Main Types
There’re basically three main PLC model and type, each of them has its own characteristics and special traits.

• The unitary model. This type of PLC is the simplest one with all basic operating system that is stored within a box or a house. The main components usually include processor – the one that runs the programs – and also connections to out and input. This type of PLC device is usually directly installed to the device that is controlled. The example of such device is the Allen Bradley’s 1000 Micrologix that has onboard type memory system, input and output ports up to 32, and communication port.


• The modular model. In this type of PLC, there’re several modules that can be made to work together to make custom controller. The main parts include input and output connection, power regulation, processor, and additional modules. Users can customize the module by adding and removing the modules. The example includes Micrologix 1200.


• The rack mount model. This type of PLC is almost the same as the unitary model but with different implementation. In unitary PLC, each module is directly connected to the base unit; in rack mount model, the modules are separated. They’re being organized one by one and each of them is connected through a special network. This system allows the system to be developed further without messing or cluttering it. The example of this PLC model is SLC 500, a commercial and industrial unit that can be useful for industrial application.

(source : program-plc.blogspot.com)

DirectSOFT5 Features

Program editing features
• Tip of the Day provides you guidance of programming, information on tips and shortcuts for taking benefit of new features
• Point and Click Editing of full-screen with the icons and mouse
• Tool Box of Edit includes icons and equivalents of hot key for all parts
• Browsers assist you to discover correct addresses, coils, contacts, and instructions of box.
• Neat features of Windows 2000/XP/Vista fully customizable and tear off toolbars, long file names, common file browsers, Tool Tips.
• Data of Project Information with every project including making and save dates, PLC type, links, project version and description.
• Cross Reference On-screen in a tabbed show that repeatedly tracks program parts as you browse your view of ladder.
• Predefined stages name for general items, for instance counter and timer current values.
• Key in your program with nicknames and give them to addresses afterward
• Access V-memory with fill in the blank Memory Editor
• Simply cut and paste groups of rungs or single rungs.
• Look for program parts by name, instruction type, address, or rung number
• Search for stables

Documentation features
• Rung comments and program mnemonics of import/export to a single text file that doesn’t have to be in format of DirectSOFT.
• Nickname, PLC address, type export to C-more in format of CSV
• Documentation editor of grid-based for easy access
• Nicknames of 16-character for addresses create programming and troubleshooting easier
• Wiring information of 16-character lets you to secure PLC addresses to panel numbers of wiring
• Address description of 6-line x 18-character offers more detailed information about the element of program
• Comments of rung can be up to 20-lines of each 69-characters
• Title page of free-form program can be chosen at printing time
• The feature of import/export for all documentation

Features of Printing
• Print any accessible view, including charts, mnemonics, and ladders.
• Multiple columns printing
• Apply zoom to increase or decrease size of print
• Make routine printouts by choosing precise items to contain for every view
• Print the documentation program, including nicknames, rung comments, descriptions, etc.
• Print program Cross Reference or Element Usage Table
• Print the contents of Data Register or PLC V-memory.

Features of Display and viewing
• Views tabbed let you to simply switch between optimize and views your area of viewing
• View the ladders of program
• View the mnemonics of program
• Stage view accessible for programs produced with instructions of RLLPLUS
• Select addresses for ladder view or rung number

Features of System setup
• Setup menu of D0-DCM is obtainable for the data communications module of DL06 and DL05
• Setup the loops of PID with dialog boxes of easy to use
• Set communication parameters of PLC via modems, Ethernet, or PC ports
• Amend operation PLC mode
• Clear memory of PLC through type or all
• Choose or amend retentive ranges of memory
• Interpret configuration of PLC I/O
• Modify configuration of I/O
• View firmware revisions of PLC
• DV-1000 Configuration.

Features of Online operation
• Help system online
• A central manager for all projects, applications, and links is DSLaunch
• Automatically make and save links of communication to the PLC, eventhough using Ethernet or modems.
• Noticeable sign communication link status of PLC
• Mode status gives visible condition of power flow for program parts, existing values for counters and timers, and existing V-memory values or locations of Data Register.
• Practice construct Data View windows to check a variety of elements.
(source : program-plc.blogspot.com)

PLC Design Tool, How It Works

Speaking about PLCs, PLC engineers should understand on how to find the best PLC design tool. It is not really surprising that PLCs have become increasingly popular among many people. With some choices available out there, many will seek for a system that can be used to increase the productivity. It is important to choose the best tool that can provide cost effective and efficient solutions. Speaking about PLCs, there is no doubt that PLCs are getting more and more popular. There are some reasons why PLCs become a popular choice among engineers especially for those who work in automation industry. Let’s find more information about PLC design tool and other info related with PLCs.
PLC Design Tool Programs
When searching for PLC design tool, there are some choices to consider. For example, there are some tools such as Moby/PLC. So what should we know about this tool? This tool is a design tool for distributed real time control programs. For PLC engineers, they should have some basic knowledge with some subjects such as physics, math and electricity. When it comes to designing and implementing the system, one should understand that there are two parts that will be introduced. The first part is the software and the second part is the hardware. The main purpose of PLCs is to replace the old system and eliminate the high cost in industry. Getting increased productivity is one aspect that many will consider from PLCs. PLC engineers should understand on how to create a system by using PLC programming. The fact is PLC have been used in some applications and manufacturing systems. Knowing how powerful PLC can be, it will help us learn more on how to optimize the use of PLCs. When it comes to discussing about the design of PLC, engineers should understand about the characteristics of PLCs and how to find the most suitable PLC design tool.


PLC Design Tool for Automation Processes
PLC design tool will be used to create and implement automation systems. There are some aspects to consider when we want to implement and create automation systems. Some of these factors are hazard analysis requirements, software quality and also hardware and software requirements. Many PLC engineers will aim for reduced development time. For those who work in automation industry, they should understand on how to find the right tool. Knowing which PLC design tool to use will help us create efficient automation systems.

LCD Display of DL06 PLC

The possible D0-06 LCD is a cost efficient panel of LCD display that is simple to install. This device is presented specially for the PLCs of DL06.
Display of 16 X 2 backlit
The display of 16 characters x 2 row installs directly on the PLC face. The LCD is backlit and is easily reached with the 7 function keys on the face of the display.

Data values Monitor or change
You can show registers of V-memory, status of I/O, mode of PLC, or system faults without breaking off the control function of PLC. Display messages needed for monitoring or alarm purposes can be imported or preprogrammed as data ASCII.

Protection of Password
Two password protection layers avoid not permitted changes to setup of clock and calendar and data values of V-memory. Each password authorization can amend calender, clock, values of V-memory, bits of force on or off, etc.

One easy ladder instruction is utilized to arrange the display. The instruction of LCD configuration is presented in DirectSOFT, ver. 4.0 or later. The handheld programmer of D2-HPP does not support LCD configuration of DL06. The User Manual of DL06 explains more wholly the operation and installation of the LCD D0-06.

Snap in installation
The display sets up simply into any model PLC of DL06. Take out power to the PLC before removing or installing the display of LCD. Eliminate the cover of plastic by sliding the coat to the left.
Change individual bits or display or 32-bit double values of word from V-memory.

Navigation of Keypad
The 7 function keys on front of the LCD display offer navigation via menu items or messages. Messages breakdown into 2 categories:
• User-defined preprogrammed messages
• Error messages
The default screen is showed when power-up. The screen default can be user-defined. The seven menu options let you to see or amend all accessible values of data.

Menu options
Depressing the key of Menu obtains you to the last menu of accessed. Every time you depress the key of Menu (or if you just hold the key of menu down) the display will pace throughout all menu options.

There are 7 integrated menus. Use the key of Menu to place the menu you require, and depress the key of Enter to look or amend values. Depress and hold the key of Menu from the message screen or a default screen. The screen will scroll throughout the following alternatives:
PLC information is M1;
System configuration is M2;
Monitor is M3;
Calendar R/W is M4;
Password operation is M5;
Error history read is M6;

LCD test and set is M7; Create a selection of menu by depressing the key of Enter. Adjustt data values with the keys of direction arrow.

Instructionn Ladder
The instruction of LCD in DirectSOFT offers the programmer of PLC a fitting way to identify messages screen. A factual string can be programmed with the instruction of LCD. Embedding changeable lets you to make specially the messages for a function that engages changing values.

The 16 characters (top line) is selected K1, and the second line is K2. The instructions of sample demonstrate how a message is expanded. A contact permissive rotates on the block of instruction, which transfers the message to the show.

The messages can also be recovered from V-memory and transferrred to the display. Choose K1 or K2 to specify which line you desire to write to and choose “From Vmemory” as the string source. ASCII text up to 16 characters can be demonstraeed per line. In the case, K16 specifies that ASCII text 16 bytes is recovered for show.
(source : program-plc.blogspot.com)

Memory PLC to Help You Store Information and Programs

Memory PLC is one of the components of the PLC which has an important role in the operation of a PLC system. The memory can be a place for data storage as well as operating program storage. The program stored in the memory is created by a professional programmer. He or she will create a ladder program. The program is then translated and stored into the memory. The memory PLC system is now very various, and today, the memory leads to the technology of a memory flash.

Memory PLC Functions
As previously mentioned, the memory PLC has a function to store data. In fact, the memory has many other functions, such as the following:
• To store information about the status of the input data.
• To give information about the timers and counters value.
• To store the program which has been previously created by programmer?
• To make a permanent program in the memory.

The PLC memory has three main parts. They are word, program and discrete registers. The program, which usually creates in ladder logic program and the old register can be stored in a flash memory. The other one, the discrete registers, can be stored in RAM memory. The division of the storage makes them clear of where you should store the data. Understanding the function of the memory PLC is surely helpful for you to create the best PLC system.

Memory PLC – How It Works
The memory PLC of a PLC system is divided in some kind of blocks. The blocks have different functions. Some of the blocks have a function to store the input and output status. The others are used to store the variables used to run the program, such as counters and timers. Today, the programming of the PLC memory is getting easier and easier. This is because the technology of flash memory has been found. The flash memory enables the users to program or reprogram the PLC system. Even, the programming and reprogramming can be done repeatedly. In addition, the flash memory has an EPROM facility. The EPROM allows the users to remove the program, once again for several times of removal. However, working with the PLC memory, especially with the flash memory, must be very careful. This is because the PLC memory does not have an indicator to show you whether the PLC memory is in good condition or has been damaged. The only indicator to make you sure that there is a damage on the memory PLC is the indicator lamp attached on the PLC system.

(source : program-plc.blogspot.com)

Model ELC-PA10AADR

ELC-PA10AADR
• Base Models with 10 to 28 I/O, Expandable to 256
• Half of the size on mostly PLCs
• No Rack Required, Mountable DIN Rail
• Integrated Integral Display of LCD
• Integrated of Integral Potentiometers
• Profibus, DeviceNet and Modbus TCP of High-level Network Access
• Remote Modules of I/O such as RTDs, Digital I/O, Analog I/O and Thermocouples

Select from one of 5 different styles of controller:
• models PB: 2 serial ports, include I/O expandable of 14 local up to 256, 3.8K program steps,
• models PC: 2 serial ports, includeI/O expandable 12 local up to 256, 7.9K program steps, 2 set point potentiometers
• models PH
• models PA
• models PV

The model of ELC-PH12 PLC offers high-speed pulse outputs which can be utilized to take any step of Omega & stepper drives direction. The software of ELCSoft ladder logic has integrated the functions of step motor which create programming your movement control application simple. The STM23S-2AN is an incorporated stepper motor and stepper drive which allows pulses from a PLC. Add the software of ELCSoft programming, programming cableof ELC-CBPCELC1 and power supply of OMPS150A24 for a whole system of motion-control that expenses a smaller amount than $1000.
Application Melsec PLC Ladder Logic in Discrete Input Multiplexing- Demultiplexing

This Note of Application is for making simpler and storing module of digital input. Every group of sensing device and pilot signaler with diodes assembled is linked to the module of digital input. And each group power common line is linked to the module of digital output and driven with sequential strobe. The digital output synchronizing strobe, every group of signaler will provide their data information to module of digital input and this will perform as multiplexing with Time Division Modulation (TDM). Or else in the PLC, digital output synchronizing strobe, data information of group of signaler from digital input module is saved in the shield memory one by one and this will operate as de-multiplexing.

Used Ladder Logics
The output from Y2C to Y2F is to output strobe sequentially for multiplexing, and a strobe is required per the multi-input group. The group of multi-input should include type of dry contact signaler such as Switch of Limit, Switch of Push-button, Switch of Thumb-wheel, semi-conductor type signaler similar to proximity switch is not appropriate for this application allowing for fast speed response.

The output of strobe should be coordinated to data train in the ladder logic. In the realistic example, At first PLC RUN scan start, DATA Train(MOV H7 K4M16) and Strobe train(MOV H2 K4M0) is synchronized. The meaning value of hexadecimal H2 and H7 is as below figure;


These train of data/strobe are moved by 1 bit when M9036 is scanned and terrified to general multi- input group power line. The information data of multi input set is acknowledge to inside coil group by action of "Safe in time" in the PLC. These results make simpler and storing module of digital input.

Example for Calculation Command Application.
• The module of Analog Input/Output
• DAI Analog Input Module Set-up A1S68AD/ A1S68DAV,
• Analog Input PV Scaling
• Threshold ON-OFF of Schmitt
• Hold of Peak Value
• Analog PV of On / Off Controller
• Clamping of Analog Value, Limitation
• Calculation Command Bit Shift
• Drive Speed Control of Analog
• SUM Finding Stable Value from Analog Input Hunting
• Control of Drive Multi stage by Feedback Encoder
• Material Mixing of Ratio Control
• Truck Loading of Trickle Control
• Single Counter of Rate Sampler
• X 0 Shifted Signal of Analog Scaling
• Y 0 Shifted Signal of Analog Scaling
• Proportional Non-Linear Curve of Piecewise
• Piecewise for Non-Linear Curve of Inverse Proportional
• Profiler Linear

PLC of Brick type - PLC of Rack type

PLC of Brick type
A brick PLC contains a case of block shaped with the strips of terminal on it. They can be DIN rail mounted or panel but come in a set of I/O capabilities

PLC of Rack type
A Rack has one or more racks of card that each circuit cards slot into so you can pick and select the I/O to whatever type and/or number you require. There is the exclusion with some of the bricks T1 series some also contain a method to put in a few additional cards and yet another link so you can put in a actual rack.

PLCs Toshiba contain both RS485 & RS232 ports, permitting the customer to read/write to any of the internal registers very simply. There are third party of packages software that offer interfaces of HMI as well as touch screens LCD. The protocol is an easy format of ASCII. You can contact and place the information with whatever program language. There is also high speed capabilities of networking available. Numerous user interface of third party packages support it - or just write down your own to work on a PC - it's easier than you think. For more information you can download the link manual of computer. And the control manual of modem.

Why PLCs Toshiba?
First, the package of software programming is the similar for bricks, Racks and highly developed PLC of T & S series. If a project brick acquires larger the program can be simply transferred to a rack or higher system.

Toshiba is recognized in global for their tremendously superior MTBF of the PLCs in addition the tremendous software of programming. Toshiba utilizes these PLCs for consumer electronic and semiconductor plants caused the establishment of an extremely beyond average environment of software and really high quality product.

Toshiba PLCs were initially planned for internal application in Toshiba plants. Amusingly when the engineers have to utilize their own devices, good things occur. Combine with outstanding design and dependability, is the great software. The software of windows based builds programming just a dragging and dropping matter the symbols into position.
Programmable Logic Controllers of ELC

The ELC stands for Eaton Logic Controller is latest offering by Eaton Cutler-Hammer into the market of PLC. Fewer than half a characteristic element PLC size, the Eaton Logic Controller is a micro-PLC by attributes in the past created only in bigger, much more costly support mount PLCs:
• Integrated analog and digital I/O for low-priced individual control
• Local I/O flexible up to 256; expansion of I/O modules join easily with no additional wiring
• Detachable blocks terminal for simple wiring
• Modbus RTU supported on both 2 serial ports
• Clock/calendar of Real-time
• Quick pulse I/Os
• Great set of instruction:
1. Hanging point math
2. Trig functions
3. Instructions of clock/calendar
4. Instructions of Modbus RTU/ASCII
5. Capture/pulse output of high-speed pulse
• Interrupts
1. Operations matrix
2. Storage of retentive data
3. Positioning control of stepper motor
4. Autotune PID functions
5. Temperature control of Fuzzy

The I/O can be local or highly distributed with the ELC. The entire specialty of ELC and analog modules such as thermocouple, analog I/O, motion control, RTD is able of remote connection through a 2-wire RS485 interface with protocol of Modbus. Extra remote modules of I/O are available

PLCSIM A virtual PLC

PLCSIM A virtual PLC 
The approach accepted is to reproduce, not essentially all the features but as strictly as possible, a real PLC, the Toshiba EX20PLUSin effect to make a virtual PLC. The EX20PLUS PLC contains of a major unit and a removable programmer. The screen of simulator displayed to a user. Shown on the display is the virtual Toshiba EX20 PLC major unit, a removable PLC programmer with a LCD, and a table status which shows the current settings of internal (R), latch (L), and output (Y) counters, coils, and timers. Linked to the inputs is a replicated input of switch simulator.

The PLC programmer simulation allows the user to enter and amend programs. The keyboard includes 35 keys which are color coded to help programming. The keys are utilized for specifying devices, for example contacts, coils, counters and timers, and for entering commands and instructions. A key is triggered by positioning to it with the pointer of mouse and clicking the left button of mouse. A graphic programming form is engaged in which symbols of ladder diagram are entered from the keypad on the programmer and the necessary ladder diagram is developed and showed on the LCD monitor. The LCD simulation screen includes three areas: a line of message which shows different information depend on the programmer mode; a line of mode which points to the programmer current mode; and a area of ladder diagram which can contain of up to 8 rungs.

After a whole ladder diagram is keyed in by a user on monitor, it is then downloaded to the PLC simulation. To operate the program, the mouse is utilized to indicate the switch of HALT/RUN on the major unit. Pressing the left button of mouse then adjusts the switch state to RUN and the program of ladder diagram is performed. The software simulator constantly reads the inputs, realizes the ladder diagram and updates the outputs. As noted, the inputs and outputs status can be examined by monitoring the states of the two sets of input and output LED simulation indicators on the major unit. The table status can be utilized to give information on the existing settings of timers, counters and coils. The intention is to offer a user with a system which has the look and feel of a actual PLC with the simulator.
Introduction of Toshiba PLCs

PLC of Toshiba family can be programmed in a variety of languages, but still the most popular is Ladder Logic Language. The Ladder-logic is a language programming that work like an electrical ladder diagram. The Ladder logic is not only a language which is self documenting graphical, but the greatest method to acquire one-of-a-type applications up and going.

Traditionally PLC come in two formats, they are Brick style & Rack Mounted