Precautions Concerning Installation - Panasonic FP2 ET-LAN Technical Manual

3.1 Precautions Concerning Installation

Noise resistance
The Ethernet is a network used in offices and buildings, where there is comparatively little noise. It does
not have a higher resistance to noise than ordinary FA application networks. Consequently, caution is
required when installing the transceiver and hub, and when laying cables.
Guidelines to noise generation
If any of the following are occurring, there is a danger that external noise is affecting the communication
circuit.
The RX LED on the ET-LAN unit is lighted or flashing, whether or not communication is taking place at
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the moment.
Cause: External noise from the communication circuit is penetrating the ET-LAN unit and is being
interpreted as a reception signal.
An error subsequent to error code 8020H has occurred.
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Cause: External noise from the communication circuit is penetrating the ET-LAN unit and is causing a
communication error.
An error subsequent to error code A001H has occurred.
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Cause: External noise from the communication circuit is penetrating the ET-LAN unit and is causing a
communication error.
Confirm the following items and take any necessary corrective action.
Check to see if the RXLED lights or flashes, or if a communication error is occurring, in synch with the
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operation of the device.
If either of these is happening in synch with the operation of the device, take whatever measures are
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necessary to suppress the generation of noise from the device side.
Measures that can be taken in the installation environment
The ET-LAN unit, transceiver, hub, and communication cables should be installed as fast as possible
from high-voltage wires, high-voltage equipment, power lines, power equipment, equipment that
generates strong breaker surges, and the wiring for any of this equipment. At least 100 mm of clearance
should be allowed when installing the equipment.
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