The difference between the PLC control system and electric control system

PLC control system and electric control system of the difference between newmaker welcome to e hall exhibition hall 3 PLC PLC controller programmable controller, PLC programming cable. 。 。 Compared to PLC control system and electric control system, there are many similarities, there are many different. Differences mainly in the following aspects: 1) From the point of view of control method, hardware connection and applied in the electrical control system control logic using mechanical relays in series or parallel combined into control logic, the attachment is much and complicated, big volume, power consumption, system structure, want to change or add features is difficult. In addition, the limited number of relays, so the electric control system is limited flexibility and scalability. And PLC adopted computer technology, its control logic is adopted for the program stored in memory, to change the control logic need to change the program, so it is easy to change or increase the system function. System wiring, small size, low consumption, less and PLC, the so-called 'soft relay' is in essence the memory unit of the state, so the 'soft' relay contact number is infinite, good flexibility and scalability of the PLC controller system. 2) Look from the works, in the relay control circuit, when power on, the circuit all relay is limited by the state, that is, the absorption of relay and at the same time, some restrictions shouldn't suck or relay not suck, this way of working is called parallel way to work. And the PLC user program is executed according to certain order cycle, so all soft relay in cycle scan connected, is conditioned by the same conditions of each relay action sequence is determined by the application of scanning sequence, this way of working is called a serial works. 3) Look from the control speed, relay control systems rely on action in order to realize the control of mechanical contact, working frequency is low, mechanical contacts jitter problem will arise. The PLC programmed instruction control semiconductor circuit to realize the control, speed, program instruction execution time in microsecond, and won't appear contact jitter problem. 4) Look from the timing and counting control, electrical control system controlled by time relay time delay in time, the time delay of time relay time easily affected by environmental temperature and temperature change, timing accuracy is not high. And PLC adopts semiconductor integrated circuit as the timer, clock pulse generated by crystal oscillator, high precision, wide range of timing, and the user can according to need to set a fixed duration in the program, modify convenience, not influenced by the environment, and the PLC have counting function, and the electric control system generally have no counting function. 5) From the point of view of reliability and maintainability, due to the electrical control system use a lot of mechanical contact, its existence abrasion, electric arc burns, etc. , life is short, the connection to the system, so poor reliability and maintainability. A large number of switch action and PLC are done by non-contact semiconductor circuit, its long service life, high reliability, PLC controller also has the self-diagnosis function, can find out their own fault, displayed to the operator at any time, and can dynamically monitor control program execution, provides convenience for commissioning and maintenance.
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