Interference from the chaotic grounding system: grounding is one of the effective means to improve the electromagnetic compatibility (EMC) of electronic equipment. Correct grounding can restrain the influence of electromagnetic interference and restrain the interference from the equipment; The wrong grounding will introduce serious interference signals, so that the DCS system will not work normally.
The ground wire of DCS control system includes: system ground, shielded ground, alternating ground and protected ground. When an abnormal state occurs, such as lightning strikes, the ground current will be larger. In addition, the shielding layer, the ground wire and the earth may form a closed loop, and under the action of changing magnetic fields, the induced current will appear in the shielding layer, which interferes with the signal loop through the coupling between the shielding layer and the core wire.
The logic voltage interference tolerance of DCS is low, and the distribution interference of the logic ground potential is easy to affect the logic operation and data storage of DCS, resulting in data confusion, program flying or crash. The distribution of simulated ground potential will lead to the decrease of measurement accuracy, and cause serious distortion and misoperation of signal measurement and control.
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