6EP1961-2BA00 inverter
Problems needing attention in PLC application
PLC is a kind of equipment used for industrial production automation control. Generally, it can be used directly in industrial environment without any measures. However, although the reliability is higher as described above and the anti-interference ability is strong, when the production environment is too harsh, the electromagnetic interference is particularly strong, or the installation is improperly used, it may cause a program error or an operation error, thereby causing a false input and Causes false output, which will cause the equipment to run out of control and malfunction, thus can not guarantee the normal operation of the PLC, to improve the reliability of the PLC control system, on the one hand requires PLC manufacturers to improve the anti-interference ability of the equipment; on the other hand, requires design In the installation, use and maintenance, it is highly valued, and multi-party cooperation can solve the problem and effectively enhance the anti-jamming performance of the system. Therefore, you should pay attention to the following issues during use:
Working environment
(1) Temperature
The PLC requires an ambient temperature of 0~55oC. It should not be placed under the component with large heat output during installation. The space for ventilation and heat dissipation should be large enough.
(2) Humidity
In order to ensure the insulation performance of the PLC, the relative humidity of the air should be less than 85% (no condensation).
(3) Vibration
The PLC should be kept away from strong vibration sources to prevent frequent or continuous vibrations with a vibration frequency of 10 to 55 Hz. When the use environment is unavoidable, shock absorption measures must be taken, such as damping rubber.
(4) Air
Avoid corrosive and flammable gases such as hydrogen chloride, hydrogen sulfide, etc. For environments with more dust or corrosive gases in the air, the PLC can be installed in a well-closed control room or control cabinet.
(5) Power supply
PLC has a certain resistance to the interference caused by the power line. In environments with high reliability requirements or particularly severe power disturbances, an isolation transformer with a shield can be installed to reduce interference between the equipment and the ground. General PLC has DC 24V output provided to the input terminal. When the input terminal uses external DC power supply, DC stabilized power supply should be selected. Because of the ordinary rectified and filtered power supply, it is easy for the PLC to receive error information due to the influence of ripple.
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