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1.The function of the power switch is to convert AC voltage into DC voltage. This is because of the DC voltage for most electricityGas equipment is safer and more stable.

2. Switching power supplies can provide higher power density than traditional transformers.

3. Most switching power supplies use switching tubes or semiconductor devices to control current and voltage

4, the efficiency of switching power supplies is usually higher than that of traditional linear power supplies.

5.In switching power supplies, the power of the transformer is usually reduced, thus reducing the volume and cost.

6. DC/DC converter (DCDC) switching power supplies can convert the voltage to the required level to meet the requirements of a specific system.

(P182)The expression of the input and the measured value1). According to the different resolution, the corresponding bit when the analog is written to the accumulator is also different, usually the left alignment is used, and the "0" is not replaced by the bit. (P181)2). This way of expression makes the replacement of the same type of module will not cause the conversion worth different because of the difference in resolution without adjusting the program.3). An analog input signal is already converted into a number inside the PLC, but the numerical conversion is normalized. (P182)

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