1. High reliability
The PLC replaces a large number of intermediate relays and time relays in the relay control system with software, and the wiring can be reduced to less than one-tenth of the relay control system, which greatly reduces the possibility of poor contact contact. In addition, the PLC itself has strong self-diagnosis capabilities, which can report error information in time, or stop running and wait for repair.
The main modules of the PLC all use large-scale or ultra-large-scale integrated circuits. The +5V power supply required for the CPU core components is filtered in multiple stages and adjusted with an integrated voltage regulator.
PLC has low requirements for the working environment, and can work normally under the condition that the ambient temperature is -20°C-65°C and the relative humidity is 35%-85%.
2. Strong anti-interference ability
The I/O design has perfect channel protection and various forms of filtering circuits to suppress high-frequency interference and weaken the interference effect between each module. In the input/output loop of the system, measures such as photoelectric isolation can effectively prevent signal interference between the loops.
In PLC, a "watchdog" is often used to monitor the user's program running time, so as to avoid the PLC from entering an endless loop or "running away" (PLC executing non-scheduled programs) during the execution of the program. As long as the cycle times out, an alarm will be issued or action will be taken accordingly.
The PLC software regularly detects the external environment, and when the PLC detects an occasional failure, it immediately stores the current state in the memory and prohibits the operation of the memory to prevent the loss of storage information. Once the fault condition disappears, it can be restored to normal and the original program can continue to work. Battery backup for program and dynamic data, after power failure, use backup battery power supply, so that the relevant status and information will not be lost.
3. Simple programming, convenient system design, modification and debugging
The most used PLC programming language today is the ladder diagram. It conforms to the reading habits of most electrical technicians in factories and enterprises, and the language is intuitive, easy to learn and use. PLC uses software methods to replace a large number of intermediate relays, time relays, counters and other devices in the relay control system, so that the design, installation and wiring of the control cabinet are greatly simplified. User programs can be simulated in the laboratory, reducing the workload of on-site commissioning. In the event of an update of production equipment or a change in the production process, the user can easily and quickly adapt to changes in process conditions by modifying their user programs.
4. Modular structure, strong versatility, simple maintenance and convenient maintenance
PLC products are serialized, standardized and modular, and users can flexibly choose according to actual needs, without the need for users to design and manufacture hardware devices by themselves.
Even if the PLC fails, it is easy to repair. The PLC has many fault warning signals, and it can also be used as a fault condition record, which is easy to diagnose. After diagnosing the fault, it can be searched by module, and the module can be simply replaced.
PLC is a product that applies microelectronics technology to industrial equipment, which is compact in structure, small in size, low in energy consumption and light in weight. Compared with relay control circuits, PLC is reduced by more than 95% in volume and power consumption by more than 70%.
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