What are the requirements of PLC to the work environment

PLC is a kind of used for industrial production automation control equipment, generally do not need to do, can be directly used in the industrial environment. However, although as mentioned in the high reliability, strong anti-jamming capability, but when the production environment is too bad, particularly strong electromagnetic interference, improper use or installation, can cause bugs or operational errors, resulting in a input error and the error output, this will lead to equipment is out of control and false action, which can guarantee the normal operation of the PLC. To improve the reliability of PLC control system, on the one hand, requires the PLC manufacturers to improve the anti-interference ability of the equipment; Requirements, on the other hand, cause attaches great importance to the design, installation and use and maintenance, parties cooperate to perfect solve the problem, effectively enhance the anti-jamming performance of the system. So in use should be paid attention to the following questions: ( 1) Temperature: PLC controller requirement in 0 ~ 55 ℃, environment temperature when installation cannot be put below the calorific value larger components, ventilation cooling around the space should be large enough. ( 2) Humidity: in order to guarantee the insulation performance of PLC, air relative humidity should be less than 85% ( No condensation) 。 ( 3) Vibration: should make PLC controller from strong vibration source, to prevent the vibration frequency of 10 ~ 55 Hz frequency or continuous vibration. When using the environment inevitably vibration damping measures must be taken, such as using damping rubber. ( 4) Corrosion and flammable gas in the air: avoid such as acid-base chemistry. For more dust in the air or the environment of corrosive gas, PLC can be installed in a closed better control room or control cabinet. Such as power plant of dry slag discharge, dry ash, etc. , in the late infrastructure increases the closed cabin. ( 5) For the power cord to the disturbance of power: PLC controller has a certain ability to resist. In the high requirement of reliability or power interference, especially serious environment can install a shield of isolation transformer, to reduce the interference between the device and ground. PLC are usually provided by a dc 24 V output to the input, when the input using an external dc power, dc regulated power supply should be chosen. Because the average power rectifier filter, because of the influence of the ripple, makes the PLC receives the error information.
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