D2D146-AA28-28 ABB

[Product features]

Estimated lead time: 1-3 days

① Brand: ABB

② Model: D2D146-AA28-28

③ Product category: module

④ Payment method: T/T, USD, Western Union

⑤ Freight: The freight in different regions shall be borne by the local freight forwarder.

⑥ Does it include tariffs? It does not include any taxes.

⑦ Packaging: use the Seller’s safe packaging.

During this period, PLC met with users in the face of quasi-computation. The software uses machine code and assembly language to write application programs, and the hardware uses small and medium-sized integrated circuits to form the system. Its function is limited to switch logic control, and its price is expensive, and it is only used in some large-scale production equipment and automatic production lines.

② Maturity period (1973-1978)

During this period, on the one hand, with the emergence of large-scale integrated circuits, a new generation of PLC with microprocessors as the core appeared, and on the other hand, ladder diagram language was adopted, which was easy to understand. This is called PLC, and the technology is also improving.

③ Great development period (1977 – present)

The development of PLC technology has always maintained two characteristics: one is to inherit the characteristics of relay control system, and the other is to apply computer technology. Therefore, with the expansion of the application of PLC, the production and research of PLC has been comprehensively promoted. The variety of products is also increasing, and the demand is also increasing, and it is very popular. PLC has also become the dominant basic automation equipment in the field of industrial control. The country has become an important industry. According to incomplete statistics, the total sales volume of PLC in the world was US $2.5 billion in 1987 and US $3.1 billion in 1988, an increase of 24% over the previous year. In 1989, it was US $3.6 billion, an increase of 16% over the previous year. In addition, new producers continue to emerge, the output and output value have increased significantly, and prices have generally declined.