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3 SPECIFICATIONS
3.3.2 RS-422/485 cable specifications
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The following shows the RS-422/485 cable specifications.
(1)
Use an RS-422/485 cable (cable connected to the QD51(-R24) terminal block),
which satisfies the following specifications, with a length of 1200 m or less.
(2)
Also, when connecting multiple devices at 1:n, n:1, or m:n, keep the total cable
length within 1200 m.
(3)
The RS-422/485 cable specifications are shown below.
Item
Cable Type
Number of Pairs
Conductor Resistance (20°C)
Insulation Resistance
Voltage Resistance
Electrostatic Capacity (1 KHz)
Characteristic Impedance (100 KHz)
Recommended conductor size
(Recommended Cables)
SPEV (SB) – MPC –0.2
SPEV (SB) – 0.2
The electrical characteristics of the recommended cables SPEV (SB) -MPC-
0.2
3P and SPEV (SB) -0.2
in their external dimensions and internal wire colors.
3P : (Manufactured by Mitsubishi Electric Wire Co.
Ltd.)
3P
: (Manufactured by Mitsubishi Electric Wire Co.
Ltd.)
3P are equivalent, but they differ somewhat
MELSEC-Q
Description
Shielded Cable
3
88.0 Ω / km or less
10,000 MΩ - km or greater
500 V DC 1 minute
Average 60 nF/km or less
110 +/- 10Ω
2
2
0.2 mm
to 0.75 mm
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