4.A2CCPU
MELSEC-A
(2) Data link module performance specifications
I
•
Table
4.2
Data
Link
Module
Performance
Specifications
-------------
Optical
Data
Link
Coaxial
Data
Link
A2CCPUP2t
A2CCPUR2t
Maximum
number
of
I/O
points
512
Max.
number
of
Input
(X)
512
points
(64
bytes)
usable link
points per station
Output
(y)
512
points
(64
bytes)
Max.
number
of
Link
reley
(B)
1024
(1/8
byte/point,
128
bytes)
link
points
in
1
system
Link
register
rt'/)
1024
(2
bytes/points,
2048
bytes)
Max.
number
of
link
points
in 1
station
Y + B + W s
1024
bytes
Allowable
momentary
power
failure
time
Within
20 msee
Communication
speed
1.25
MBPS
Communication
method
Half
duplex
bit
serial method
Synchronous
method
Frame
synchronous
method
Transmission path
method
Duplex
loop
method
Overall loop
distance
*1
Max. 10 km (32810 It) Max. 10 km (32810 It)
(1 km (3281 It)
station
interval)
(500 m (1640.5 It)
station
intervaQ
Number
of
connected
stations
Max. 65
units/loop
(1 master station, 64 local/remote I/O stations)
Demodulation
method
CMI
method
Transmission
format
Conforms
to
HOLe
(frame
method)
Error
control
system
Retrydue to CRC (generating polynomial X
16
+X
12
+
x.s
+ 1) and time over
RAS
function
Loopback
function
due
to
error
detection
and
cable
breakage,
diagnostic
function
such
as
host
link
line
Connector
2-core
optical
connector
plug
BNC-P-5, BNC-P-3-NI (DDK)
(CA9003)
equivalent
Cable
used
81-200/250 3C-2V, 5C-2V
equivalent
IREMARKSI
The
overall
loop
distance
is
the
distance
from
the
sending
port
of
the
master
station
to
the
receiving
port
of the
master
station
via
slave
stations.
The
maximum
loop
distance
is
10 km (32,810 tt) in
both
optical
and coaxial
cable
loop.
Overall
loop
distance
4-3
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