What is the difference between PLC and PMC?

PMC is PLC, but Fanuc calls it very similar to PLC, because it is dedicated to machine tools, so it is called programmable machine controller. Compared with the traditional relay control circuit, the advantages of PMC are: fast time response, high control accuracy, good reliability, control program can be changed with different applications, and the interface and maintenance of the computer are convenient.

The main difference between FANUC PMC and PLC is that he also has a part of the dedicated interface signal with the system, generally PLC only has input and output control of peripheral components, PMC is to transmit to the corresponding dedicated address of the system after processing the peripheral interface signal to achieve the corresponding system function, for example, if you input M03 S100 on the screen, the system must first process the special signal F in the ladder diagram.

The trapezoidal diagram processes the peripheral input signals such as chuck clamping tailstock and closing the door, etc., and then transmits them to the special G address of the system, and then the spindle can be operated. The same is true in the SIEMENS system, if you use the standard S7-300, you will definitely not be able to control the system, so in the 840D, the PLC is integrated in the NCU module and is specially used by the CNC system.

PLC is a programmable logic controller, which is a kind of programmable memory used to store programs inside it, to perform user-oriented instructions such as logic operations, sequence control, timing, counting and arithmetic operations, and to control various types of machinery or production processes through digital or analog input and output.

PMC is a subset of PLC, and some manufacturers refer to PLC dedicated to CNC machine tools as PMC, so PMC and PLC are very similar.

The advantages of PMC are:

Fast time response, high control accuracy, good reliability, control program can be changed with different applications, and the interface and maintenance of the computer are convenient.

What is PLC".

PLC is the abbreviation of "product life cycle", and the full name in English is Product Life Cycle, that is, the whole process of a product from design and development to entering the market and exiting the market.

PLC vs. PM

As far as the product itself is concerned, there is a cycle from life to death, and the only person who accompanies it is its creator, the product manager of the product, in other words, the product manager is the person in charge of a product from life to death.

The PM must have an understanding of the characteristics of each life cycle of the product so that it can respond calmly.

Five stages

R&D period. Commitment period.

Formative period. Saturation period.

Recession periodDevelopment period

From the idea of developing a product to the period of successful product manufacturing.

During this period, the sales of this product were zero, and the company's investment continued to increase.

Commitment period.

When a new product is put into the market, it enters the investment period.

At this time, the customer does not know about the product, and only a few customers who are looking for novelty may buy it, and the sales volume is very low.

In order to expand the market, a large amount of ** expenses are required to promote the product.

At this stage, due to technical reasons, the product can not be produced in large quantities, so the cost is high, the sales volume is slow, and the enterprise not only does not get profits, but may lose money.

The product also needs to be further improved.

Formative period.

At this time, customers are already familiar with the product, a large number of new customers begin to buy, and the market gradually expands.

The products are mass-produced, the production cost is relatively reduced, the company's sales are rising rapidly, and the profits are also growing rapidly.

Competitors see that it is profitable, and will enter the market to participate in the competition, so that the supply of similar products increases, and then declines, and the growth rate of corporate profits gradually slows down, and finally reaches the highest point of life cycle profits.

Saturation period.

The market demand tends to be saturated, the potential customers are few, and the sales growth is slow until it turns down, marking the maturity of the product.

At this stage, competition gradually intensifies, product prices decrease, expenses increase, and corporate profits decline.

Recession period

With the development of science and technology, the emergence of new products or new substitutes will change the consumption habits of customers and turn to other products, so that the sales and profits of the original products will decline rapidly.

As a result, the product entered a period of recession again.