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5. WIRING
/MELSEC
( 2 ) RS-422 m u l t i d r o ~ connection.
External
!quipment
as
master
station
A 0 5 1
as
master
station
equipment
..........
S D A
..........
...........
CS A
..........
CSB
..........
RSA
.
.
-
. .
-
. .
-
.
RSB
.
-
.
.
- -
.
- -
.
-........
.........
.........
. . . . . . . . .
. . . . . . . . .
.........
R D A
R D A
.........
.........
R D B
........-
.........
POINT
1
A maximum of 32 stations may be included in the multidrop
system with an overall link distance of 500m.
I
RS-422 multidrop cabling should conform t o the following specifications.
Item
Specifications
Cable type
Shielded cabie
Conductor resistance (2O0CI
8 8 . 0 R i k m or less
l n ~ u l a t ~ o n
reristance
10.000MR-km or less
Dielectric strength
500V D C f o i 1 minute
Electrostati~ capacity (1 KHz)
6OnFikrn or less on average
Characteristic impedance (100KHzl
1 1 0 i l O R
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