Omron CJ1W-FLN22, Operation Manual, Page: 39 / 277

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Precautions Section 1-6
1-6 Precautions
Be sure to observe the following precautions when installing and using an FL-
net Unit.
1-6-1 Installation
Observe the following precautions when installing an FL-net Unit.
1,2,3... 1. Use transceiver cable that meets IEEE802.3 standards to ensure high
noise resistance.
2. Use a transceiver with a current consumption of not more than 0.4 A per
port.
3. Always turn OFF the power supply to the PLC before connecting or discon-
necting the transceiver cable.
4. Be sure not to exceed the current capacity of the Power Supply Unit on the
Rack to which the FL-net Unit is mounted. The current consumption is 380
mA maximum for the CS-series FL-net Unit and 370 mA for the CJ-series
FL-net Unit. This value added to the current consumption of all other Units
mounted to the same Rack must not exceed the capacity of the Power
Supply Unit.
5. Do not install the transceiver cables or coaxial cables of the network near
power supply lines. If installation near possible sources of noise is unavoid-
able, install the cables in grounded metal ducts or take other measure to
eliminate noise interference.
1-6-2 Ethernet and IEEE802.3 Standards
The FL-net Unit was designed based on Version-2.0 Ethernet standards and
not on the international IEEE802.3 standards, which were developed based
on Ethernet specifications. Although these two sets of standards are similar,
they are not necessarily the same. Particularly, different frame formats are
used, making direct communications impossible between systems that do not
support the same standards. Standards for equipment used to configure net-
works are the same, allowing IEEE802.3-standard equipment to be used with
the FL-net Unit. In particular, the transceiver cable for the IEEE802.3 stan-
dards provides superior noise resistance and should be used for the FL-net
Unit.
Terminology also differs between Version-2.0 Ethernet and IEEE802.3 stan-
dards. These differences are shown in the following table. Version-2.0 Ether-
net terminology is used in this manual.
Ethernet IEEE802.3
Transceiver MAU
Transceiver cable AUI
Ethernet address MAC address
Ethernet 10Base-5/10Base-T