Please Contact Us if Necessary , Email :
The characteristics and classification of PLC basic training

The characteristics and classification of PLC basic training

Shared by: Zheng Chuhong

I still remember that when I joined UniMAT, the company's first training course was about the definition, characteristics and classification of PLC, and I have benefited a lot so far. Some people may think that as a graphic designer, there is not much actual contact with products and customers, and it does not matter if you do not understand products, but UniMAT does not think so. The automation industry is a very specialized industry. No matter what position it is, the basic knowledge of products must be necessary, and mastering it is more helpful to the work. Below, I will share some of the training content at that time with all friends who have transferred to the automation industry from other industries.

A PLC is an electronic system that operates digitally and is designed for use in an industrial environment. It uses programmable memory to store instructions for performing operations such as logic operations, sequential control, timing, counting, and arithmetic operations, and controls various operations through digital and analog inputs and outputs. Type of machinery or production process. PLC and its related equipment should be designed according to the principle of easy to form a whole with the industrial control system and easy to expand its functions.

1. Features of PLC:

1. High reliability and long service life

2. Strong environmental adaptability

3. Flexible and universal

4. Easy to use and easy to maintain

5. The entire connection process only needs a screwdriver to complete.

Second, the classification of PLC

PLC is produced by the needs of modern mass production, and the classification of PLC must also meet the needs of modern production. Generally speaking, programmable controllers can be classified from three aspects. One is to classify from the size of PLC control, the other is to classify from the performance level of PLC, and the third is to classify from the structural characteristics of PLC.

1. Classification according to the control scale: it can be divided into mainframes, medium-sized computers and minicomputers.

(1) Small computer: The control point of a small computer is generally within 256 points, which is suitable for the control of a single computer or a small system.

(1) Japan Omron Corporation CQM1

Processing speed: 0.5~10ms/1k words

Memory: 3.2~7.2k

Digital 192 points, analog 44 channels

(2) Germany SIEMENS S7-200

Processing speed: 0.8~1.2ms

RAM: 2k

Digital: 248 points, 35 points analog

(2) Medium-sized machine: The control point of the medium-sized machine generally does not exceed 2048 points, which can directly control the equipment, and can also monitor multiple next-level PLCs. Suitable for control of medium or large control systems.

(1) Japan OMRON company C200HG

Processing speed 0.15~ 0.6 ms/ 1k words

Memory 15.2~31.2k

Quantity 1184 points

(2) Germany SIEMENS S7-300

Processing speed: 0.8~1.2ms

RAM: 2k

Digital 1024 points, analog 128 channels

Network: PROFIBUS, Industrial Ethernet, MPI

(3) The control points of the host are generally greater than 2048 points, which can not only complete complex arithmetic operations, but also perform complex matrix operations. Not only can the equipment be directly controlled, but also multiple next-level programmable controllers can be monitored.

(1) Japan Fuji F200

Processing speed: 2.5ms/1k words

RAM: 32k

Input and output points: 3200

(2) Japan Omron CV2000

Processing speed 0.125ms / 1k words

Memory 62k I/O points 2048

(3) Germany SIEMENS S7-400

Processing speed: 0.3ms/1k words

RAM: 512k

Number of input and output points: 12672

(4) Germany AEG A500

Processing speed: 1.3ms/1k words

RAM: 62k 64k

Input and output points: 5088

2. Classification according to control performance: it can be divided into high-end machines, mid-end machines and low-end machines.

(1) Low-end machine

This type of PLC has basic control functions and general computing power. The working speed is relatively low, and the number of input and output modules in the energy band is relatively small. For example, the S7-200 produced by the German SIEMENS company belongs to this category.

(2) Mid-range machine

The PLC has powerful control functions and powerful computing power. It can not only complete general logic operations, but also more complex trigonometric, exponential and PID operations. The working speed is relatively fast, the number of input and output modules that can be brought is also relatively large, and the types of input and output modules are also relatively large. For example, the S7-300 produced by the German SIEMENS company belongs to this category.

(3) High-end machine

This type of PLC

Leave a comment

Please note: comments must be approved before they are published.

If You Would Like to Contact Support or Make a Purchase Please Fill out the Form

If you have urgent needs, please call our customer service number

Please fill in your information in detail so that our support staff can clearly understand your needs.

Value is required
Value is required
Please input the correct email address
Value is required
Thank you!