Mitsubishi Electronics A1SJ71AR23Q ユーザーズマニュアル
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5.4 Wiring
5.4.3 Shielded twisted pair cable
5.4.3 Shielded twisted pair cable
5
PREPARATORY PROCEDURES BEFORE
OPERATION
5.4.3
Shielded twisted pair cable
The following describes how to connect a shielded twisted pair cable with the local
module.
module.
(1) Precautions for wiring
(a) Laying shielded twisted pair cable
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.
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.)
(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.
(b) Connection of terminating resistor
For the stations at both ends of the MELSECNET/B data link system, connect
SDA/RDA and SDB/RDB with an attached terminating resistor (110 , 1/2W).
(Refer to
(Refer to
(c) Connecting/disconnecting a shielded twisted pair cable
Be sure to shut off all phases of the external power supply used by the system.
(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.
In addition, use a terminating resistor for stations at both ends.
Figure 5.12 Connection method
SDA/RDA
SDB/RDB
SG(L)
FG
SDA/RDA
SDB/RDB
SG(L)
FG
SDA/RDA
SDB/RDB
SG(L)
FG
SDA/RDA
SDB/RDB
SG(L)
FG
Shielded twisted pair cable
Terminating
resistor
(110 1/2W)
Terminating
resistor
(110 1/2W)