HONEYWELL CC-TDOB01 技术参数 _ 山西润盛进出口有限公司

When choosing equipment, firstly choose products with high anti-interference ability, including electromagnetic compatibility (EMC), especially anti-external interference ability, such as PLC system with floating technology and good isolation performance; Understand the anti-interference indicators given by the manufacturer, such as the common analog system ratio, the poor analog system ratio, the withstand voltage capability, the allowable electric field strength and high frequency magnetic field strength environment; the other is to check its performance in similar work. application performance. When choosing imported products, pay attention: my country adopts 220V high internal resistance power grid system, while Europe and the United States use 110V low internal resistance power grid. Due to the large internal resistance of my country’s power grid, the large zero-point potential drift, and the large ground potential change, the electromagnetic interference of industrial enterprises is at least 4 times higher than that in Europe and the United States, and the system has higher requirements for anti-interference performance. PLC products that can work normally abroad In the domestic industry, it may not be able to operate reliably, which requires a reasonable choice according to our country’s standard (GB/T13926) when using foreign products.

Comprehensive anti-jamming design

Mainly consider several if suppression measures from outside the system. The main contents include: shielding the PLC system and the outer leads to prevent electromagnetic interference from space radiation; isolation and filtering of the outer leads, especially the principle power cables, layered arrangement to prevent the introduction of conducted electromagnetic interference through the outer leads; correct design of the grounding point And grounding device, perfect grounding system. In addition, software means must be used to further improve the safety and reliability of the system.

Main anti-interference measures

Adopt the power supply with excellent performance to suppress the interference introduced by the power grid

In the PLC control system, the power supply occupies a very important position. The power grid interference into the PLC control system is mainly coupled into the PLC system power supply (such as CPU power supply, I/O power supply, etc.), the transmitter power supply and the instrument power supply that has a direct electrical connection with the PLC system. Now, for the power supply of the PLC system, the power supply with better isolation performance is generally used, while the power supply of the transmitter and the power supply of the instrument with direct electrical connection to the PLC system have not received enough attention, although certain measures have been taken. The isolation measures are generally not enough. The main reason is that the isolation transformer used has large distribution parameters and poor interference suppression capability. Common mode interference and differential mode interference are connected in series through power coupling. Therefore, for the power supply of the transmitter and the common signal instrument, the distributor with small distributed capacitance and large suppression band (such as using multiple isolation and shielding and leakage inductance technology) should be selected to reduce the interference of the PLC system.

In addition, to ensure that the power grid feed point is not interrupted, an online uninterruptible power supply (UPS) can be used to supply power to improve the safety and reliability of power supply. And UPS also has strong interference isolation performance, it is an ideal power supply for PLC control system.

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