Table 3: Cable length guidelines for recommended wire sizes for low-voltage (<30 V) Inputs and Outputs
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 cable 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 cable 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
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 applies to low-voltage (<30 V) inputs
and outputs only.
Figure 8: Maximum wire length for low-voltage (<30
V) Inputs and Outputs by current and wire size
Communications bus and supply power
wiring guidelines
The provides information about the functions, ratings,
and requirements for the communication bus and supply
power terminals. The table also provides guidelines for
wire sizes, cable types, and cable lengths for when you
wire the controller's communication buses and supply
power.
In addition, observe these guidelines when you wire an SA
or FC bus and the 24 VAC supply power:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All SA and FC bus cables, regardless of wire size, should
be twisted, insulated, stranded copper wire.
• Shielded cable is strongly recommended for all SA and
FC bus cables.
• Refer to the
MS/TP Communications Bus Technical
Bulletin (LIT-12011034)
for detailed information
regarding wire size and cable length requirements for
SA and FC buses.
Communications bus and supply power
terminal block
Note:
The SA Bus and FC Bus wiring
recommendations in this table are for MS/TP
bus communications at 38.4k baud. For more
information, refer to the
MS/TP Communications Bus
Technical Bulletin (LIT-12011034).
Table 4: Communications bus and supply power terminal blocks, functions, ratings, requirements, and cables
Terminal block/
Port label
Terminal labels
Function, electrical ratings/Requirements
Recommended cable type
+
-
FC Bus Communications
COM
Signal Reference (Common) for Bus
communications
FC BUS
SHLD
Isolated terminal (optional shield drain
connection )
0.6 mm (22 AWG) stranded, 3-wire
twisted, shielded cable recommended
FAC3611 Advanced Application Controller Installation Guide
8
