Table 7: Cable length guidelines for recommended wire sizes
Guideline
Wire size/gauge and type
Maximum cable length and
type
Assumptions
1.0 mm (18 AWG) stranded copper
457 m (1,500 ft) twisted wire
0.8 mm (20 AWG) stranded copper
297 m (975 ft) twisted wire
0.6 mm (22 AWG) stranded copper
183 m (600 ft) twisted wire
A
0.5 mm (24 AWG) stranded copper
107 m (350 ft) twisted wire
100 mV maximum voltage drop
Depending on the cable length
and the connected input or
output device, you may have
to define an offset in the setup
software for the input or output
point.
1.0 mm (18 AWG) stranded copper
229 m (750 ft) twisted wire
0.8 mm (20 AWG) stranded copper
137 m (450 ft) twisted wire
0.6 mm (22 AWG) stranded copper
91 m (300 ft) twisted wire
B
0.5 mm (24 AWG) stranded copper
61 m (200 ft) twisted wire
100 mV maximum voltage drop
Depending on the cable length
and the connected input or
output device, you may have
to define an offset in the setup
software for the input or output
point.
C
See Figure 8 to select wire size/gauge. Use
stranded copper wire.
See Figure 8 to determine cable
length. Use twisted wire cable.
N/A
Maximum cable length versus load current
In most cases inputs/outputs with cables less than 30 m (100 ft) do not require an offset in the software setup. Cable
runs over 30 m (100 ft) may require an offset in the input/output software setup. Use Figure 8 to estimate the maximum
cable length relative to the wire size and the load current (in mA) when wiring inputs and outputs.
Figure 8: Maximum wire length by current and wire size
Communications Bus and supply terminal blocks, functions, ratings, requirements,
and cables
Table 8: Communications Bus and supply terminal blocks, functions, ratings, requirements, and cables
Terminal block/
port label
Terminal
labels
Function, electrical ratings/requirements
Recommended cable type
- (03)
+ (04)
FC Bus Communications
COM (02)
Signal Reference (Common) for bus communications
FC BUS
SHLD (01)
Isolated terminal (optional shield drain connection)
0.6 mm (22 AWG) stranded, 3-
wire twisted, shielded cable
recommended
FC BUS
(port)
FC Bus
RJ12 6-Position Modular Connector provides:
•
FC Bus Communications
•
FC Bus Signal References and 15 VDC Common
•
15 VDC Power for Wireless Commissioning
•
Converter or ZFR1811 Wireless Router
Wireless Commissioning Converter
retractable cable or 24 AWG 3-pair
CAT 3 Cable <30.5 m (100 ft)
F4-SNC Installation Guide
11
