Hardware measures:
The main modules use large-scale or ultra-large-scale integrated circuits, a large number of switching actions are completed by non-contact electronic memory, and the I/O system is designed with complete channel protection and signal conditioning circuits.
① Shielding—Main components such as power transformers, CPUs, programmers, etc., are shielded by materials with good electrical conductivity and magnetic conductivity to prevent external interference.
② Filtering – Various forms of filtering are used for the power supply system and input lines, such as LC or π-type filtering networks, to eliminate or suppress high-frequency interference, and to weaken the mutual influence between various modules.
③ Power supply adjustment and protection – The +5V power supply required by the core component of the microprocessor is multi-stage filtered and adjusted with an integrated voltage regulator to adapt to the fluctuation of the AC power grid and the influence of overvoltage and undervoltage.
④ Isolation – between the microprocessor and the I/O circuit, photoelectric isolation measures are adopted to effectively isolate the electrical connection between the I/O interface and the CPU, reducing faults and malfunctions; isolated from each other.
⑤ Adopt a modular structure – this structure is helpful for short-term repair in case of failure. Once a module is found to be faulty, it can be quickly replaced to restore the system to normal operation; it also helps to speed up the search for the cause of the fault.
PM511V08
