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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
Retry
due 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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