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2.7
Date Code 20020501
SEL-2701 Ethernet Processor Instruction Manual
Installation
Network Connections
Figure 2.8
100BASE-FX and 10/100BASE-T Port Configuration.
Figure 2.9
100BASE-FX and 10BASE-FL Port Configuration.
Twisted-Pair
Networks
While Unshielded Twisted Pair (UTP) cables dominate office Ethernet
networks, Shielded Twisted Pair (STP) cables are often used in industrial
applications. The SEL-2701 is compatible with standard UTP cables for
Ethernet networks as well as STP cables for Ethernet networks.
NOTE:
Use caution when applying
the SEL-2701 with UTP cables as
these cables do not provide adequate
immunity to interference in
electrically noisy environments unless
additional shielding measures are
employed.
Typically UTP cables are installed in relatively low-noise environments
including offices, homes, and schools. Where noise levels are high, you must
either use STP cable or shield UTP using grounded ferrous raceways such as
steel conduit.
Several types of STP bulk cable and patch cables are available for use in
Ethernet networks. If noise in your environment is severe, you should consider
using fiber-optic cables. We strongly advise against using twisted-pair cables
for segments that leave or enter the control house.
If you use twisted-pair cables, you should use care to isolate these cables from
sources of noise to the maximum extent possible. Do not install twisted-pair
cables in trenches, raceways, or wireways with unshielded power,
instrumentation, or control cables. Do not install twisted-pair cables in parallel
with power, instrumentation, or control wiring within panels, rather make
them perpendicular to the other wiring.
You must use a cable and connector rated as Category 5 (CAT 5) to operate the
twisted-pair interface (10/100BASE-T) at 100 Mbps. Because lower
categories are becoming rare and because you may upgrade a 10 Mbps
network to 100 Mbps, we recommend using all CAT 5 components.
Some industrial Ethernet network devices use 9-pin connectors for STP
cables. The SEL-2701 RJ-45 connectors are grounded so you can ground the
shielded cable using a standard, externally shielded jack with cables
terminating at the SEL-2701.
Lnk/Rx
Port A
Port B
B
A
Rx 100FX Tx
SEL-2701
10/100T
Pwr/Tx
SN: 2000189163
Lnk/Rx
Port A
Port B
B
A
Rx 100FX Tx
Rx 10FL Tx
SEL-2701
Pwr/Tx
SN: 2000189163
Содержание SEL-2701
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