Learn PLC programming, what steps are required, and how the PLC program controls the output and inpu

What are the advantages of PLC programming training? If you want to know more about this, you can consult Shanghai Program Control Education Technology****. The company is an institution specializing in automation skills training.

The company is headquartered in Kunshan and has a number of branches across the country. The company's current business scope mainly involves: Mitsubishi PLC system integration, electrical system design, DCS system, motion control, system configuration, industrial robots (ABB + KUKA + Fanuc + Yaskawa), machine vision, engineering project management, MES, etc.

First of all, you must have a basic electrician, understand the working principle of relay circuits, and know the meaning of self-locking interlocking interlocks. The basic programming of PLC is similar to that of relay circuits, it is best to learn Mitsubishi's first, he is more suitable for the thinking of the Easterners, and Siemens is suitable for the thinking of the Westerners.

Buy a book and take a look, the programming language is divided into statement tables and ladder diagrams, you just look at the ladder diagram.

There are many types of PLCs, so choose the type you want to learn and start with basic statements. And choose the programming method that suits you, ladder diagram or function block or whatever.

Do it yourself, make more programs, and even more complex programs are simple sentences.

Recommended schools Siemens PLC, S7-200, 300, 400. These programming software have PLC simulators, you can see if your program is not accurate, whether it meets the functional requirements. 300 and 400 programming software simulators for analog** monitoring.

When you first start learning, first look at the role of PLC, and then choose a small machine in a brand (Siemens S7-200 is recommended),**Related books and software,,,In the process, you can**routines to learn people's ideas and methods。。。

Yes, refer to the Encyclopedia Programmable Logic Controller: First, during the input sampling phase, the Programmable Logic Controller reads all input states and data sequentially in a scanning manner and stores them in the corresponding unit in the IO image area. After the input sampling is complete, it moves to the user program execution and output refresh phase.

In both phases.

That is, the input state and data will not change if the input state and data are changed. Therefore, if the input is a pulsed signal, the width of the pulse signal must be greater than one scan period to ensure that the input can be read in any case.

The program of PLC is usually a ladder diagram, which is written with the corresponding programming software, and the programming software used by different PLC brands is different.

There are three types of PLC output: relay output, thyristor output, and transistor output.

Features: 1. Relay output type:

The CPU drives the relay coil to make the contacts engage, so that the external power supply can drive the external load through the closed contact, the open circuit leakage current is zero, the response time is slow (about 10ms), and the external load can be large;

2. Transistor output type:

The CPU turns the transistor on and off through optical coupling to control the external DC load, and the response time is fast (approx., can be with small external load;

3. Thyristor output type:

The CPU turns the triac on and off through optical coupling to control the external AC load, with large open-circuit leakage current and fast response time (about 1ms).

1.Relay output is used for input control with an output frequency of less than 10Hz.

2.Transistor output can output high-frequency pulses, which can control servo or stepper motors and other places where high-speed pulses are required.

3.Thyristor output is used for high-frequency output that requires high current control.

There is an introduction in every book. Before asking questions, think about whether you should ask them, whether others will laugh at them, some inexplicable questions, and it is best not to ask those in the book.

This mainly has CPU module, I O module, storage module, positioning module, motion module and so on, if you want to ask the manufacturer, they will provide a variety of modules for you, the most used is Siemens, Mitsubishi, Omron The most critical is the CPU module and input and output module.

According to the different field input signals, the input module can be divided into switching input module and analog input module.

The function of the switching input module is to turn various switching signals into TTL standard signals required by the CPU.

According to the input power supply type, it can be used as DC input module and AC input module.

The input signal is converted into a TTL (5V) standard signal through photoelectric coupling after voltage division, current limiting, and filtering. The function of the analog input module is to convert the continuously changing analog signals such as temperature, flow, current, voltage, etc. into several digital signals that the CPU can process. The analog input circuit is generally composed of op amp conversion, analog-to-digital conversion (AD), optoelectronic isolation, etc.

Hello, the PLC must be powered on to communicate with the input program device, if the input used is a computer, you need to install programming software, and then program it, or open the program that has been programmed, choose to write from the PC to the PLC, and wait for the program input is completed, OK!