PLC (Programmable Logic Controller) has been invented in 1968, after more than 40 years of development, it is already a very mature controller. According to the estimates of research institutions, more than 70% of PLC applications are below 128 points and are purely digital I/O, and engineers only need to use digital I/O, a small amount of analog I/O, and simple programming skills. 80% of industrial applications, so the trend of PLC in recent years is towards low-cost and simple PLC, which has promoted the growth of low-cost micro-PLC.
However, although on the one hand 80% of the applications require the use of simple low-cost controllers, on the other hand, the other 20% of applications exceed the functions that traditional PLC control systems can provide. Engineers developing these 20% applications require higher cycle speeds, complex control calculations, more simulation functions, and better integration with enterprise networks.
In addition, the traditional control types in the industrial field include discrete control, process control, and motion control. In the past, independent and dedicated controllers were often used. When communicating with each other, a large amount of engineering software was required, which was heavy and complicated. Therefore, this part of the demand makes PLC begin to evolve into open architecture, unified development software, covering a variety of control types, complete the horizontal integration of the control platform, in system design, project implementation, operation and maintenance, training, system integration, In terms of spare parts and other links, user costs are greatly reduced.

According to this demand, the concept of PAC (Programmable Automation Controller) came into being. PAC was proposed in 2001 by Craig Resnick, a senior researcher of ARC Consulting Group. When talking about the meaning of creating this new term, Craig Resnick said, "PLC is very active in the market, and it has developed well and has strong vitality. However, PLC is also changing in many aspects and increasing its charm. Automation supplier We are constantly working on the development of PLC to meet the needs of the market and users. The enhancement of functions promotes the emergence of a new generation of systems. PAC is based on open industrial standards, multi-domain functions, a common open platform, and high performance. ARC created these Words to help users define application needs and help manufacturers to be clearer when talking about their products.

After the PAC concept was put forward, GE Fanucl received a positive response. In 2003, it released its PACSystems series products RX7i and RX3i.

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