The PLC maintenance and overhaul the main content

Although PLC failure rate is very low, composed of PLC control system can be long-term, stable and reliable work, single for maintenance and inspection of it is indispensable. Generally every half a periodic inspection should be made for PLC controller system. Maintenance content includes: ( 1) The power supply. Check the PLC controller power supply voltage is within the scope of the standard. The working voltage of the ac power range of 85 ~ 264 v, 24 v dc power supply voltage should be. ( 2) Environmental conditions. See if the temperature of the control cabinet within 0 ~ 55 ℃, relative humidity 35% The 85% range, and free of dust, iron dust, etc. PLC family of WWW. 100. com（ 3) Installation conditions. Connecting cable connector is inserted completely tighten, screw loosening, each unit of reliable fixation, do you have any loose. ( 4) The I/O bus voltages. Shall be within the scope of the job requirements of voltage.
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