GE UR8AH Communication card
“PLC is an electronic device specially designed for digital operation in industrial environment. It uses programmable memory to store instructions of logic operation, sequential operation, timing, counting and arithmetic operation, and can control various types of machinery or production processes through digital or analog input and output. PLC and its related peripheral equipment should be designed according to the principle of easy connection with industrial control system and easy expansion of its functions.” 3 The hydraulic decoking electrical control system is composed of the high pressure pump room electrical control cabinet, the tower top positive pressure explosion-proof operation panel and the tower bottom contact switch box. 4. Control flow chart and working principle of hydraulic decoking electrical control system
(1) Temperature PLC requires an ambient temperature of 0~55oC. During installation, it should not be placed under elements with large heat, and the surrounding ventilation and heat dissipation space should be large enough.
(2) Humidity To ensure the insulation performance of PLC, the relative humidity of air should be less than 85% (non condensing).
(3) The vibration shall keep the PLC away from strong vibration sources and prevent frequent or continuous vibration with vibration frequency of 10~55Hz. When vibration is unavoidable in the use environment, damping measures must be taken, such as damping rubber.
(4) The air shall be free of corrosive and flammable gases, such as hydrogen chloride, hydrogen sulfide, etc. For the environment with more dust or corrosive gas in the air, PLC can be installed in the control room or control cabinet with good sealing.
(5) The power supply PLC has certain ability of resisting power line interference. In the environment with high reliability requirements or serious power interference, isolation transformer with shielding layer can be installed to reduce the interference between the equipment and the ground. Generally, PLC has DC 24V output to the input. When external DC power supply is used at the input end, DC regulated power supply shall be selected. Due to the influence of ripple, ordinary rectifier and filter power supply is easy to make PLC receive error information.
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