Panasonic FPS Series, User Manual

Page: 111 / 332

Installation and Wiring
FP Σ 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
).