The difference between the PLC and RLC and contact RCL and the application of PLC

In the numerical control machine tool before, sequence control technology has been widely used in industrial production. Many mechanical equipment working process need to follow certain steps or order. Sequence control which is based on mechanical equipment running status and time, make its good order order to work as stipulated in the advance of a kind of control mode. Sequential control device used in the numerical control machine tool, Or system) There are two main types, one is the traditional relay logic circuit, hereinafter referred to as RLC ( 继电器逻辑电路) 。 The other was a 'programmable controller', namely the PLC. RLC is to relay, contactor, button, switch, etc electromechanical control device with wires connected together in order to realize the sequence control function of the circuit. In practical applications, the RLC has some difficult to overcome shortcomings. Such as: can only solve the simple logic operations of switch quantity, timing, counting and limited several functions such as control, it is difficult to realize the complex logic operations, arithmetic, data processing, and control of nc machine tools needed for many special features, modify control logic need to increase or decrease control components and rewiring, installation and adjustment cycle is long, big workload; Relay, contactor, such as large size, each work contact device co. , LTD. When the machine is controlled object is more, or control action sequence is complicated, need to adopt a large number of devices, and thus the RLC bulky, high power consumption, reliability, etc. Because RLC above shortcomings, therefore can only be used for general industrial equipment and CNC lathe, CNC drilling machine, CNC boring machine and other nc machine tool control logic is simple. Compared with RLC, working principle of the PLC is a kind of completely different sequence control device. PLC has the following basic functions: (1) PLC is simplified by computer. In order to adapt to the requirement of sequence control, PLC computer saves some number-crunching functions, and strengthen the function of logic operation control, is a kind of function between relay control and computer control automatic control device. PLC has some features similar to that of the computer device and unit, they include: the CPU, control program and user program memory used to store system, the interface of the data communications with external devices and power supply etc. As with external machinery and processes to achieve signal transmission, PLC also has input, output signal interface. PLC has the function of these devices and units, can be used to complete a variety of the specified control tasks. The basic function of PLC system structure diagram is shown in figure 1. Figure 1 (2) the basic function of PLC system structure A user-oriented instructions and dedicated to store the user program memory. User control logic with software implementation. Is suitable for the complex control object movement, control logic need to be change. 3) User program use graphic symbols and more logical order relation and relay circuit very approximate 'ladder diagram editor. Working principle of the ladder diagram image intuitive, easy to understand and master. 4) PLC and programming machine, programmer, personal computers and other equipment connection, can easily achieve the program show, edit, diagnosis, storage and delivery etc. 5) PLC relay that poor contact, contact welding, wear and failure such as coil burn out. In the operation of no vibration, no noise, and has strong anti-interference ability, can be in poor environment ( Such as: dust, high temperature, humidity, etc. ) Under the condition of stable and reliable working. 6) PLC, compact structure, small volume, easy loading machine tool electrical box inside or the outside, is advantageous for the realization of nc machine tool mechanical and electrical integration. The development and utilization of the PLC controller, CNC machine provide a new kind of sequence control device, and soon in the practical application shows strong vitality. PLC has now become the numerical control machine tool of a kind of basic control device. Compared with RLC, PLC of nc machine tool structure is more compact, more rich, more reliable. For turning center, processing center, FMC, FMS and other mechanical movement complex, high degree of automation of processing equipment and manufacturing system, PLC is indispensable control device.
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