PLC is the abbreviation of programmable logic controller. Its basic structure are composed of power, CPU, memory, input/output interface circuit, function module and communication module. PLC can change the form of relay-contacts control, and can make it adjustable for electric motors' speed of every file, acceleration time and braking time according to practical conditions. PLC functions include calculating, controlling, programming, communicating, diagnosing, processing. Because PLC has various advantages and can make heavy duty overhead cranes more safety and convenient, Dongqi Enterprise apply PLC in overhead crane system. Its advantages are following. 1. Convenient use, simple program 2. Strong function, highly cost-effective 3. Complete hardware, convenient use for customers, strong adaptability 4. High reliability, strong anti-interference capability 5. Little work for system's design, installation and test 6. Little work for maintenance and convenient maintenance.
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