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The PLC host comprises a CPU, memory (EPROM and RAM), input/output units, peripheral I/O interfaces, communication interfaces, and a power supply. Building upon traditional sequential controllers, the PLC control system integrates microelectronics, computer, automatic control, and communication technologies, giving rise to a new generation of industrial control devices. Its purpose is to replace relay‑based logic, timing, counting, and other sequential control functions, thereby establishing a flexible, remote‑control system.
Electrical control cabinets assemble switching devices, measuring instruments, protective relays, and auxiliary equipment within enclosed or semi-enclosed metal enclosures or panels, in accordance with electrical wiring requirements. Their layout must ensure normal operation of the power system, facilitate maintenance, and safeguard both personnel and surrounding equipment. An energy management system is an information‑based control platform designed to help industrial enterprises expand production while optimizing energy planning and utilization, reducing energy consumption per unit of output, enhancing economic efficiency, and lowering CO2 emissions. In a monolithic PLC, all components are housed within a single enclosure. By contrast, modular PLCs consist of individually packaged units—called modules—that are mounted on a rack and interconnected via cables. These modules communicate with the central processor through power buses, control buses, address buses, and data buses, enabling the integration of various external devices tailored to specific control tasks and thereby forming diverse PLC control systems. Common external devices include programmers, EPROM writers, and similar equipment. Additionally, PLC communication modules can be configured to interface with host computers or other PLCs, supporting the implementation of distributed PLC control systems.
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Jiangsu Chengye Tools Co., Ltd.
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