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3.1 Performance Specifications
3
SPECIFICATIONS
(3) Performance specifications of MELSECNET/B data link system and
A1SJ71AT23BQ
Table 3.3 Performance specifications of MELSECNET/B data link system and A1SJ71AT23BQ
Item
Specifications
MELSECNET/B data link system
MELSECNET mode MELSECNET II mode
MELSECNET II composite
mode
Maximum applicable
link points per station
Input (X) Up to the maximum number of I/O points for the CPU module used in the master station is
applicable.
(The total number of link points for slave station is equal to the number of link using points for the
master station)
Output (Y)
Maximum link points
in a system
Link relay (B) 1024 points (128 byte) 4096 points (512 byte)
Link register
(W)
1024 points (2048 byte) 4096 points (8192 byte)
Maximum link points
per station
Master station
1024 byte
1024 byte (First half of link parameters)
1024 byte (Latter half of link parameters)
Local station
Remote I/O
station
512 byte
Number of I/O points: 512
points
-
512 byte
Number of I/O points: 512
points
Communication speed 125kbps/250kbps/500kbps/1Mbps
Communication method Half duplex bit serial method
Synchronization method Frame synchronization method
Transmission path Bus method
Overall cable distance
Changed due to communication speed
(125kbps: 1200m, 250kbps: 600m, 500kbps: 400m, 1Mbps: 200m)
Number of connected stations Up to 32 (Master station: 1, The total number of local stations and remote I/O stations: 31)
Modulation method NRZI method
Transmission format Conforming to HDLC (Frame format)
Error control system
Retries due to CRC (generating polynomial X
16
+ X
12
+ X
5
+
1) and time out
RAS function Diagnostic function including link line check of host station etc.
Connector Terminal block
Applicable cable Shielded twisted pair cable (User prepared)
Number of I/O occupied points 32 points (Intelli: 32 points)
Internal current consumption (5VDC) 0.66A
Weight 0.22kg