Grounding is to achieve a low impedance link between the circuit, the Danyun, and the first-class point or the equipotential surface that is used as the common reference point of the signal. The grounding of the dcs system is to ensure that when the signal entering the dcs system, the power supply or the equipment of the dcs system has a problem, the effective grounding system can withstand the overload current and can quickly lead the overload current to the ground.