Installation and Wiring
FPΣ User's Manual
94
6.7.1 Transmission Cables
Please use the following cables for systems using RS485 type communication cassettes.
Conductor Insulator
Type
Size
[mm
2
]
Resistance (at
20°C) [Ω/km]
Material
Thickness
[mm]
Cable
diameter
[mm]
≥1.25
(AWG16)
≤16.8 ≤0.5 ≈8.5
Shielded twisted pair
1
2
3
4
≥0.5
(AWG20)
≤33.4
Polyethylene
≤0.5 ≈7.8
VCTF
1
2
3
≥0.75
(AWG18)
≤25.1
Polychlorinated
biphenyl
≤0.6 ≈6.6
1
Cover
2
Insulator
3
Conductor
4
Shield
NOTE
• Only use shielded twisted pair cables.
• Only use one type of transmission cable. Do not mix more than one type.
• Twisted pair cables are recommended in noisy environments.
• When using shielded cable with crossover wiring for the RS485
transmission line, ground one end.
• If two wires are connected to the plus and minus terminals of the RS485
port of FPG-COM4, use wires of the same cross-sectional area (0.5–
0.75mm
2
).
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