Wiring; Wiring Procedure; Cable - Mitsubishi Electric FX5 User Manual

5.5

Wiring

This section explains about the wiring.

Wiring procedure

1.
Preparing for wiring
Prepare cables and termination resistors required for wiring. (Page 131 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, RS-232C communication equipment. (Page 134 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
Pair
Shield
Description
Shielded cable
2p, 3p
88.0 /km or less
10000 M-km or more
500 V DC, 1minute
60 nF/km or less as an average
11010 
Example of three-pair cable structural drawing
5 NON-PROTOCOL COMMUNICATION
5
131
5.5 Wiring