Wiring considerations and guidelines
Table 11: Ethernet network rules
Category Allowed maximums and rules
General Star topology with network switches
2,000 m (6,600 ft) for plastic or glass fiber optic with external adapterLine length and type
1000 BaseT: 100 m (330 ft) CAT5E cable
100 BaseT: 100 m (330 ft) CAT5 cable
10 BaseT: 100 m (330 ft) CAT5 cable
Terminations For 1000/100/10 BaseT, no line terminators allowed.
Table 12: FC Bus rules for MS/TP devices
Category Allowed maximums and rules
General One FC Bus with up to 50 MS/TP devices for SNC2515x-0 and SNC1612x-0 and up to 4 MS/TP
devices for the SNC2515x-04x and SNC1612x-04x.
Note: An FC port on a SNC can connect to only one bus segment on an FC Bus.
Only a daisy-chain topology is allowed (no Star or T topology configurations).
One FC Bus Supports up to 50 MS/TP controllers on a single FC Bus segment for the SNC2515x-0
or SNC1612x-0.
Number of devices
One FC Bus Supports up to 4 MS/TP controllers on a single FC Bus segment for the SNC2515x-04x
or SNC1612x-04x.
FC Bus can be up to 1,520 m (4,987 ft) using 0.6 mm (22 AWG) 3-wire twisted, shielded cable.Cable length for FC Bus
When using fiber-optic connections: 2,010 m (6,594 ft) between two fiber-optic modems.
Cable Stranded 0.6 mm (22 AWG) 3-wire twisted, shielded cable is recommended.
Stranded 0.6 mm (22 AWG) 4-wire (two twisted-pairs) shielded cable is acceptable.
Note: Ensure the + and - bus leads are a twisted pair. On applications using 4-wire two
twisted-pairs cable, isolate and insulate unused conductor.
EOL termination on the FC Bus The EOL switch must be set to on (or an EOL terminator installed) on the two devices located
at either end of each bus segment on an FC Bus. The EOL switches must be set to off (or EOL
termination disabled) for all other devices on the bus segment on an FC Bus.
Table 13: SA Bus rules
Category Allowed maximums and rules
General Each bus supervisor supports one SA Bus.
Number of SA devices SA Bus applications are limited to a power load of 240 mA. The best practice when configuring an
SA bus is to limit the total available operating power consumption to 100 mA or less.
Note: Refer to the technical specifications on the type of sensors you are using as this limits
the amount of devices on the SA Bus.
365 m (1,198 ft) maximum bus length.
152 m (500 ft) maximum between an NS network sensor and the bus supervisor SNC supplying
power to the sensor) using bus cable connected to the SA Bus screw terminal blocks.
30 m (98 ft) maximum length for network sensors using bus cables connected to the 6-pin
modular jack (6-Pin SA Bus port).
Cable length for SA Bus
366 m (1,198 ft) maximum Bus Length.
Recommended bus cable type Screw Terminal Connections: 0.6 mm (22 AWG) Stranded 4-wire, 2-Twisted Pairs, Shielded Cable
for screw terminals.
Modular Jack Connections: 6-Pin Modular Connectors with 24 or 26 AWG 6-Wire, 3 Twisted-Pairs.
EOL termination on the SA Bus Each SA Bus supervisor has integral (fixed ON) EOL termination, which provides sufficient EOL
termination on a SA Bus. Long SA Bus runs or persistent communication problems on a SA Bus
may require EOL termination at the last device on the SA Bus in addition to the integral EOL
termination at the SA Bus supervisor) All SNC models are SA Bus supervisors.
F4-SNC Installation Guide 21
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