Chapter 5 Wiring
Solving noise problem
5-16
The special type 3 ground (resistance less than 10ohm) must be installed separately with PLC
ground.
Applying underground pipeline may isolate the voltage induced from the air. (Under
thunderbolt, the
voltage induced from the air may be exceeding 24 VDC.) The pipeline should be
buried underground in depth at least 60 cm.
60cm or 120cm depth under ground
Applying relay to input/output signal wire may isolate induced voltage and protect the PLC
from
damage.
5.3 Anti-Noise for Expansion Cable
If an elector-magnetic switch is operating ON/OFF action near the PLC or expansion cable, it is
possible to generate messy noise or high voltage and cause undesired effect to the PLC. Please
install surge protector beside the elector-magnetic switch. The system expansion cable must not be
placed into the same wiring duct with any other input/output signal or power line.
5.4 Anti-Noise for I/O Wiring
Please apply insulated twisted pair to be input signal line to prevent noise interference. Shielding
wire of insulated twisted pair should be connected to the FG terminal of TP03 and then to the ground.
Please refer to “Precautions for connecting output terminals” for information.
Surge Absorber is not included in the output circuit of relay output module. Please apply
additional surge absorber in operation.
Power lines should be arranged away from input/output signal line and communication wire to
prevent noise interference.
In case the signal connection distance of input/output wire is longer, input wires should be wired
separately to the output wires to prevent noise interference.
Never wire the signal lines of PLC to the same wiring duct of any other power line.
Inverter
TP03
Inverter
TP03
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