Epson EM07ZS1647F User Manual page 145

Countermeasure 1: Improve FG.
Countermeasure 2: Disconnect the FG wire to isolate it from the ground.
♦ Induced noise via communication cable
Separate the PROFIBUS DP signal wire from the other wires (especially power wires).
PLC input/output wire
PLC power wire
Control circuit wire
Power wire
During site inspection, bypass the wire that is possibly affected by induced noise with other
cables and then lay the cables. Establish the communication under no induced noise
condition and verify whether an error occurs.
Fieldbus I/O Rev.6
Isoelectric Line
Grounding Screw
Slave Device
When noise intrudes the ground line because a noise source such as an inverter is
installed near the grounding point, disconnect the shield wire of the signal cable and
isolate it from the ground to restrain noise intrusion.
* Separate the signal wire from the power wires 300 mm or more.
Light electrical cable
Communication cable
Signal wire
Control cable
Power cable
4. Troubleshooting (PROFIBUS DP)
Peel the cable covering and
secure the cable with FG clamps.
Grounding Screw
Slave Device
Disconnect the grounding wire.
Suspended ducts
1
300 mm
2
or more
Conduit
300 mm
1 2
or more
Floor ducts
1 2
1 Signal wire
PLC input/output wire
2 Power wire
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