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Section Sharing the Same Power Supply 3-6 3-7 Correcting Faulty Operation Caused by Noise When noise is thought to be the cause of a malfunction in the DeviceNet network, the following measures may be effective. Communications Cable Shielding Suspend the communications cable shielding wire without grounding it. This will filter the noise that flows from the ground to the communications cable and will filter the noise current that flows in the shielding wire. Communications Power Supply Suspend the communications power supply without grounding it. This will also filter the noise that flows from the communications power supply ground to the communications cable or the noise current that flows in the shielding wire. The switching power supply is usually connected to the case and the capacitor as shown below. The FG terminal must be suspended and the control board for the power supply itself must be insulated. Switching Power Supply Configuration Switching power supply AC power supply Power supply circuit AC input DC output Casing Suspending the Communications Power Supply S82J power supply DC power supply Insulating material (such as baked board or acrylic board) S82Y-jjN (Mounting Tool) When using S82J power supply 3-7 When using other power supplies Sharing the Same Power Supply Slave Units in the DeviceNet network can be classified into three types according to how the power is supplied, as shown below. (The DeviceNet Interface Unit is the middle type.) Communications power supply Slave Unit Internal circuit power supply I/O power supply Communications power supply Same power supply for communications and internal circuit Slave Unit Slave Unit I/O power supply Internal circuit power supply Because the power supplies for the communications, internal circuit and I/O are individually insulated as shown below, as a general rule each power supply should be connected separately. Communications circuit Internal circuit Insulation Communications power supply 40 I/O circuit Insulation Internal circuit power supply Insulation I/O power supply
