PLC控制系統的地線包括系統地、屏蔽地、交流地和保護地等。接地系統混亂對PLC系統的干擾主要是各個接地點電位分布不均，不同接地點間存在地電位差，引起地環路電流，影響系統正常工作。例如電纜屏蔽層必須一點接地，如果電纜屏蔽層兩端A、B都接地，就存在地電位差，有電流流過屏蔽層，當發生異常狀態如雷擊時，地線電流將更大。
IC697PWR724 The 24 VDC, 90 Watt Power Supply Module GE Fanuc 90-70 IC697PWR724 is a rack-mounted unit that plugs directly into a 48-pin backplanemounted connector in the leftmost slot in the rack. GE Fanuc 90-70 provides +5 volt, +12 volt and -12 volt power, and logic level sequencing signals to the backplane. GE Fanuc 90-70 can be used either in a single rack application, or can also be used to provide power to a second rack if the total load is within the supply rating.
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