Mitsubishi MELSEC LJ71C24, User Manual

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6 SETTING AND WIRING
6.3.2 RS-422/485 cable specifications
The following shows the RS-422/485 cable specification.
(1) Use a cable that satisfies the following specification for the RS-422/485 cable
(cable to connect the C24 terminal block) within 1200m in length.
Item Description
Cable type Shielded cable
Number of pairs 3
Conductor resistance (20
°
C) 88.0 /km or less
Insulation resistance 10000 M - km or more
Dielectric strength 500 V DC, 1 minute
Electrostatic capacitance (1 kHz) 60nF/km or less on average
Characteristic impedance (100 kHz) 110 ± 10
Recommended conductor size 0.2 mm
2
to 0.75 mm
2
Diameter AWG22 to AWG16
Type Stranded
Material Copper
Temperature rating 60°C or more
[Recommended cable]
SPEV (SB)-MPC-0.2 3P ..... (MITSUBISHI CABLE INDUSTRIES, Ltd.)
SPEV (SB)-0.2 3P ..... ..... ...(MITSUBISHI CABLE INDUSTRIES, Ltd.)
SPEV (SB)-0.3 3P .... ..... ....(MITSUBISHI CABLE INDUSTRIES, Ltd.)
The recommended cables above have the same electrical characteristics, but
different external diameter and internal wire colors.
(2) The total distance must be within 1200 m when two or more device are connected
in a 1:n or m:n configuration.