Why do you say with PLC to realize control of the system is very reliable

Using PLC controller to realize control of the system is very reliable. This is because in the two aspects of hardware and software of PLC are adopted many measures to ensure that it can work reliably. In fact, if the PLC work unreliable, cannot be used in the industrial environment, also not be PLC. 1, in the hardware aspects: PLC input/output circuit and internal CPU is electrical isolation. The information on optical coupling device or electromagnetic device. And, the CPU board and electromagnetic interference shielding measures. It can ensure the operation of the PLC program is not affected by external electric and magnetic interference, can work normally. PLC is non-contact, more use of components and is highly integrated, quantity is not too much, also provides the material basis for its reliable work. On the mechanical structure design and manufacture process, to make the PLC can work safely and reliably, and has taken many measures, to ensure that the PLC resistance to vibration and impact resistance. Using the environment temperature can be as high as more than 50 degrees Celsius, some PLC can be as high as 80 - - 90 degrees. Some PLC controller module but hot standby, a host, another host is running, but not in control, just as a backup. Once work host fails, hot standby can be automatically replaced its work. In a redundant, and further the use of three designs, CPU, I/O module, power supply module redundancy or some redundancy. Three sets of work at the same time, the final output depends on the three most of the result of the decision. This can make the system failure probability is almost zero, bulletproof. Of course, such a system cost is high, only for important occasions, such as railway Station Road fork control system. On software: PLC works for scanning and interruption, this can ensure that it can work in an orderly way, avoid relay control system often appear & quot; Adventure competition & quot; And the control result is always determined; And emergency treatment to control, to ensure the timely response of the PLC in emergency situation, make the PLC can work reliably. For monitoring the PLC program is normal operation, the PLC system are set up & quot; Guard dog & quot; ( Watchingdog) Monitoring program. Run at the beginning of the user program, first clear & quot; Guard dog & quot; Timer, and start timing. When user program a circular run out, check the timer duration of the program. If the timeout ( Generally no more than 100 ms) , then report to the police. Timeout, serious still can make PLC to stop working. The user may take corresponding emergency measures in accordance with the alarm signal. Timer project duration if not timeout, then repeat the process of starting, the PLC will work properly. Obviously, with this & quot; Guard dog & quot; Monitoring program, can guarantee the normal operation of the PLC user program, but avoid & quot; Infinite loop & quot; And affect its working reliability. PLC has many to prevent and detect the fault's instructions, to produce a prompt signal of various important modules work normally or not. By the corresponding user program to the working condition of PLC, and monitor PLC control system, to ensure its reliable work. PLC after each access to electricity, also must run self-checking program and initialized to the system. This is the system configuration program, user intervention. Has the corresponding error signal malfunction. It is in the aspects of hardware and software of PLC has strong reliability measures, to ensure the PLC has the characteristics of reliable work. Its MTBF can reach more than tens of thousands of hours; There is something wrong with the average repair time is very short, a few hours so that a few minutes. It has been done why use PLC questionnaire. In answer, most users reliable PLC work as the main reason of it, namely the PLC can work reliably, as its preferred indicators.
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