Wiring; Wiring Procedure; Cable - Mitsubishi MELSEC iQ-F FX5 User Manual

2.5

Wiring

This section explains about the wiring.
For the wiring of FX3 PLC, refer to FX Series User's Manual - Data Communication Edition.

Wiring procedure

1.
Preparing for wiring
Prepare cables required for wiring. (Page 21 Cable)
2.
Turn OFF the PLC power
Before wiring, make sure that the PLC power is OFF.
3.
Wire the communication equipment.
Connect the RS-485 communication equipment. (Page 23 Connection diagram)

Cable

Select cables using the procedure described below.
Twisted pair cable
Use shielded twisted pair cables for connecting RS-485 communication equipment.
The specifications of the cables used in wiring are shown.
■RS-485 cable specifications
Items
Cable type
Number of pairs
Conductor resistance (20)
Insulation resistance
Voltage resistance
Electrostatic capacitance (1 kHz)
Characteristic impedance (100 kHz)
■Cable structural drawing (reference)
Example of two-pair cable structural drawing
Connecting cables
The table below shows applicable cables and tightening torques.
FX5U CPU module built-in RS-485 port
FX5UC CPU module built-in RS-485 port
FX5-485-BD
FX5-485ADP
Pair
Shield
Number of wires
connected per
terminal
One wire
Two wires
One wire
Two wires
Descriptions
Shielded cable
2p, 3p
88.0 Ω/km or less
10000 MΩ-km or more
500 V DC, 1 minute
60 nF/km or less by an average
110±10 Ω
Example of three-pair cable structural drawing
Wire size
Solid wire, Wire ferrule with
Stranded wire insulation sleeve
2
0.2 to 0.5 mm 0.2 to 0.5 mm
(AWG24 to 20) (AWG24 to 20)
2

0.2 mm (AWG24)
2
0.3 to 0.5 mm 0.3 to 0.5 mm
(AWG22 to 20) (AWG22 to 20)
2

0.3 mm (AWG22)
Tightening torque
2
0.22 to 0.25 N⋅m
2
2 N:N NETWORK
2.5 Wiring
2
21