ABB 216NG63A-HESG441635R1 Expansion module
Several years later, the construction of digital industrial control systems was completed. This system uses a single computer to control the entire industrial control system, which is called Direct Digital Control (DDC), that is, the generation of industrial control system: computer centralized control system. At the same time, the structure of modern industrial control system has gradually become clear, and its core components have begun to form:
Programmable logic controller (PLC): 216NG63A relay used in industrial control system gradually shows its limitations. The relay is expensive, and once it is configured and started, it is difficult to change its control logic. These defects have led to the development of programmable logic controllers. The name of the PLC delivered for use is Modicon, which is derived from the combination of English abbreviations of modular digital controller. After that, 216NG63A was used by the Kobchak Grinding Company in Plyfield, Vermont. The user spoke highly of it, saying that it had “no large number of switches, no fans, no noise and no vulnerable parts”. With the development of large-scale integrated circuits, the control ability of 216NG63A programmable logic control is increasingly enhanced. Its available input and output ports have increased from several in the early days to hundreds now. The control frequency has also increased rapidly with the improvement of the speed of large-scale integrated circuits. The precision manufacturing industry that needs to be intensive and controlled benefits from the development of programmable logic controllers. With the development of communication technology, PLC has also changed from closed private communication protocol to open public protocol, which greatly improves the compatibility of the system and facilitates the maintenance and update of the system. 216NG63A data acquisition and monitoring system (SCADA): The data acquisition and monitoring system has started to be applied to industrial control systems with a very large regional or geographical span, such as high-voltage substations adjacent to thermal power plants, water supply systems and wastewater collection systems, oil and gas pipeline systems, etc. Its main functions are collecting system status information, processing data and long-distance communication. 216NG63A According to various data collected by the data acquisition and monitoring system, the management personnel of the control center can carry out various operations to maintain the normal operation of the whole system. Remote terminal unit (RTU): The improvement of data acquisition and monitoring system requires the development of remote terminal unit.
In the 1960s, generation remote terminal units were deployed in power plants. 216NG63A is equipped with additional power supply system because the remote terminal unit needs to operate even in the case of power failure in the power plant. Since the remote terminal unit operates in a continuous scanning and rapid response state, the communication protocol of 216NG63A must be both safe and secure, and security is the top priority. Therefore, the protocols used by the early remote control unit suppliers are different, and the systems of each supplier are completely incompatible. With the promotion of the Institute of Electrical and Electronic Engineers (IEEE) and the development of microprocessor-based communication interface, the compatibility of the remote terminal unit has been gradually solved.
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