3 SPECIFICATIONS

3.3.2 RS-422/485 cable specifications

The following shows the RS-422/485 cable specification.

MELSEC-Q

(1)Use a 1200 m (3937 ft.), or shorter, cable that satisfies the following specification for the RS-422/485 cable (cable to connect the Q series C24 terminal block).

(2)Make the total distance within 1200 m (3937 ft.) when two or more device are connected in a 1:n or m:n configuration.

(3)The RS-422/485 cable specification is shown below.

Item

 

 

Description

Cable type

 

 

Shielded cable

Number of pairs

 

 

3P

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 cable)

..... (MITSUBISHI CABLE INDUSTRIES, Ltd.)

SPEV (SB)-MPC-0.2

3P

SPEV (SB)-0.2 3P

.............. (MITSUBISHI CABLE INDUSTRIES, Ltd.)

SPEV (SB)-MPC-0.2

3P and SPEV (SB)-0.2 3P have the same electrical

characteristics, but different external diameter and internal wire colors.

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