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FX3U Series Programmable Controllers 9 Preparation for Wiring and Power Supply Wiring Procedures User’s Manual - Hardware Edition 9.4 9.4 Grounding Grounding Ground the PLC as stated below. • Perform class D grounding. (Grounding resistance: 100Ω or less) • Ground the PLC independently if possible. If it cannot be grounded independently, ground it jointly as shown below. PLC Another equipment Independent grounding Best condition PLC Another equipment Shared grounding Good condition PLC Another equipment Common grounding Not allowed Extension devices of PLC (except expansion board and special communication/high-speed input/output adapter) PLC Special adapter Expansion board Main unit Input/output extension unit Special extension Another equipment Independent grounding Class D grounding (grounding resistance : 100Ω or less) • Use ground wires thicker than AWG14 (2 mm2). • Position the grounding point as close to the PLC as possible to decrease the length of the ground wire. 154
