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　　(2) Installation environment

　　PLC is suitable for industrial field. In order to ensure its working reliability and prolong its service life, attention should be paid to the surrounding environmental conditions during installation: the ambient temperature is in the range of 0 ~ 55℃; The relative humidity is in the range of 35% ~ 85% (no frost), and there are no flammable or corrosive gases, excessive dust and metal particles around; Avoid excessive vibration and impact; Avoid direct sunlight and water sputtering.

　　(3) Installation precautions

　　In addition to environmental factors, attention should also be paid to installation: all units of PLC should be installed and disassembled when power is cut off; Do not drop wires, metal scraps and other sundries into the body; A certain space should be reserved around the module to facilitate ventilation and heat dissipation around the machine body. In addition, in order to prevent the interference of high electronic noise to the module, S7-200 module should be separated from the equipment (such as frequency converter) that produces high electronic noise as far as possible.