Reasons for interference Issues with materials and equipment The control signals connected to the DCS system usually use cables as transmission media to send signals to the DCS system. When the insulation material of the signal cable ages and the shielding material is damaged, it will be interfered by other electromagnetic interference sources, which will cause measurement errors. Severe interference can cause equipment damage. Construction is not standardized In DCS control systems, there are often many signals connected to DCS simultaneously. These signal lines either go through cable trays or cable conduits, resulting in many different types of cables being attached to the same path on site. There are distributed capacitors between these signals, which can be used to add interference to other signal lines. At the same time, alternating magnetic flux is generated in the surrounding environment of signal transmission, such as power lines,
