Shielded Twisted Pair Cable - Mitsubishi Electric A1SJ71AP23Q User Manual

5.3 Shielded Twisted Pair Cable

This section describes how to connect a shielded twisted pair cable with
the local module.
(1) Precautions for wiring
(a) Laying shielded twisted pair cable
(b) Connection of terminating resistor
(c) Installing/removing shielded twisted pair cable
(2) Connection of cable
A shielded twisted pair cable is connected as shown below.
In addition, use a terminating resistor for stations at both ends.
SDA/RDA
Terminating
resistor
SDB/RDB
(110 1/2W)
SG(L)
FG
When laying a shielded twisted pair cable, pay attention to the
following points so that it will not be affected by noise or surge
induction.
1) Do not install a shielded twisted pair cable together with
the main circuit, high-voltage cable, or load line, and also
do not bring them closer to each other. (Keep a distance of
100mm (3.94 inch) or more between them.)
2) Do not use a part of shielded twisted pair cable (for
example, one pair among three pairs) as a cable for power
supply.
For the stations at both ends of the MELSECNET/B data link
system, connect SDA/RDA and SDB/RDB with an attahced
terminating resistor (110 , 1/2W).
Be sure to shut off all phases of the external power supply
used by the system.
SDA/RDA
SDB/RDB
SG(L)
FG
Shielded twisted pair cable
Figure 5.5 Connection method
SDA/RDA
SDB/RDB
SG(L)
FG
17
SDA/RDA
Terminating
resistor
SDB/RDB
(110 1/2W)
SG(L)
FG