The main cause of PLC control system reliability, reduce

Although industrial control machine and the programmable controller itself has a high reliability, but there is an error if the amount of switch input to the PLC signal, analog signal appear large deviation, PLC controller output control actuator without action by the requirement, all of these may make the control process error, cause irreparable economic losses. Affect the input to the PLC signal is the main reason for the error are: 1) Transmission line caused by short circuit or open circuit ( Due to mechanical drag, aging lines themselves, especially the rat) , when the transmission line is out of order, the signal cannot be transmitted to the PLC, the control error; 2) Mechanical contact jitter, although the site contact closed only once, PLC said closed many times, although the hardware filter circuit, software increase differential instruction, but as a result of PLC controller scan cycle is too short, can still be error in the count, accumulation and shift instruction, there is an error control result; 3) The transmitter, mechanical switch itself is out of order, such as contact point contact undesirable, transmitter reflect the non-electricity or not work properly, the deflection these failures will also make the control system can not work normally. Affect the actuators are the main reason for the error are: 1) PLC control load contact cannot be reliable action, the action, but the actuator is not required to action; 2) Control frequency inverter starting, due to the fault inverter itself, with motor and frequency converter is not required; 3) All kinds of electric valve, solenoid valve, the open failed to open, closed can't shut in place, because the actuator failed to according to the requirements of PLC controller control action, make the system cannot work normally, reduces the system reliability. To improve the reliability of the whole control system, we must improve the reliability of the input signal and the accuracy of the executing agency action, or PLC should be able to timely found the problem, with sound and light alarm, such as way to suggest to the operating personnel, troubleshooting as soon as possible, make the system safe, reliable and work correctly.
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