Generally speaking, on the one hand, it is developing towards network, large-scale, high-reliability, and multi-functional aspects, on the other hand, it is developing toward miniaturization, low-cost, simple and convenient.
Since the birth of the first plc in 1969, so far, after four generations of product development, processor, high-speed CPU, greatly improve the performance, reliability and stability of plc. Diversified functions and become a multi-function programmable controller.
1. Networked. Mainly to the development of distributed control systems, so that it has dcs functions. Networking and enhanced communication capabilities are also an aspect of development in recent years. There are multiple plc control stations down, multiple l/O components, up to the industrial computer, Ethernet, MAP network to form the factory's automation control system.
2. High reliability. Since the reliability of the control system has become the focus of attention in the field of engineering technology, plc has widely used self-diagnostic technology, redundancy technology, and fault-tolerant technology in existing products. Many plc manufacturers have introduced high-reliability redundant systems.
3, multi-functional. In order to meet the needs of various special complex controls in the project, a new multi-functional intelligent module was introduced on the original basis.
4. Integration of control management. In order to meet the needs of industrial modern production control and management, plc will also adopt computer technology, network technology, graphic display technology, and communication technology.
5 programming languages are highly hierarchical. Based on the original ladder diagram, statement list, sequence function, function block, and instruction list, plc continues to enrich the programming language and move toward a higher level.
Plc is widely used in small and medium-sized enterprises. In the future, plc will continue to develop in the hardware and software and communication fields to adapt to the needs of the future enterprises, so that the industrial automation industry will advance steadily.