PLC anti-jamming software on the measures should be taken

Fault detection: PLC itself has a perfect self-diagnosis function, but in engineering practice, the PLC I/o devices such as limit switches, solenoid valve, contactor, etc. The failure rate is significantly higher than that of PLC itself, the failure rate of these components after a failure, the PLC generally won't notice it, will not stop immediately, which can result in multiple fault occurred, personal equipment accident, serious when malfunction after downtime to also want to spend a lot of time [ 4] 。 Available for the convenience of detection fault ladder diagram program implementation, here introduces a kind of combination logic judgment method, the system is running, PLC there is a certain relationship between the input and output signals, so according to the output signal of the logical relationship between the state and the control process to determine whether the equipment operation is normal. Data protection and recovery: when there is an accidental fault conditions, does not destroy the PLC internal information, once the fault conditions disappear, could keep the original resume normal work. So, PLC in detecting the fault condition, immediately save now state in memory, cooperate to closed storage software, prohibit any operation of storage, in case of storage information torn away once detection to the external environment of normal, can restore to the state before the failure, continue to work the original program. Set the alarm clock WDT: mechanical equipment action time is generally the same, can be for reference to these time, when the control signal from PLC controller, the corresponding mechanical action, at the same time starts a timer, timer Settings than under normal circumstances the action of mechanical equipment 20% longer, if the time, haven't received the actuator motion signals the end of the PLC is started. Improve the reliability of the input signal: due to electromagnetic interference and noise, the influence of factors such as analog signal error, will cause the error of the input signal, cause judgment procedure, cause an accident, for example, a shaking of the button, relay contact instantly beating misoperation will cause system, software time delay can be used to shake. For analog signal error could take the influence of the analog signal sampling three times in a row, sampling interval based on the a/d conversion time and the change of the signal frequency, three data has been stored in different data register, after comparing the average value or take the middle as the current input values.
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