3.
SPECIFICATIONS
MELSEC-A
3.2.3
RS422
terminal block
specifications
~~
I
I
I
1
Signal Direalon
A171
C24
c.
Abbreviation
Computer
Description
I
I
SDA
.
Send data
1
Receive data
Receive data
Signal ground
Frame ground
Fig.
3.2
RS-422 Terminal Block Specifications
(1)
Fig.
3.3
shows the
RS-422
function block diagram.
data
h
I1
RDA
RDB
I
Fig.
3.3
RS-422 Function Block Diagram
3.2.4
RS-422
cable speciflcritlon8
An
RS-422
cable is recommended in Section
3.2.1.
Other types
of
cables
may be used instead, if they conform to the specifications listed in the
following table.
I
item
I
Doscrlption
I
Cable
type
88.0
Qlkm
or
less
Conductor resistance (20°C)
3
Pairs
Number
of
pairs
Shielded cable
Insulation resistance
500
VDC,
1
minute
Dielectric strength
10.000
MQ km or less
1
Electrostatic caDacitv
(1
KHz1
I
60
nFlkm
or
less on averaae
I
I
Characteristic impedance
(100
KHz)
1
1102
1OQ
I
Fig. 3.4 RS-422 Cable Specifications
(km
=
3-5
n
a
:-7
I
3
4
J
1
d'
1
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