Mitsubishi Electric MELSEC-A Series Manual page 148

4
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
(5) Performance comparison of AJ71BR11/A1SJ71BR11/ AJ71QBR11/A1SJ71QBR11 and
QJ71BR11 (MELSECNET/10 mode)
Item
A1SJ71BR11
Maximum
LX/LY 8192 points
number of link
LB 8192 points
points per
LW 8192 points
network
Maximum number of link
{(LY + LB)  8 + (2 × LW)}
points per station
Communication speed 10Mbps
Communication method Token bus method
Synchronous type Frame synchronization method
Encoding method Manchester code
Transmission method Single bus
Transmission format HDLC standards (frame format)
255 (Total number
of PLC to PLC
Maximum number of
networks and
networks
remote I/O
networks)
Maximum number of
9
groups
Number of stations
32 stations (Control station: 1, normal station: 31)
connected in one network
Applicable cable 3C-2V, 5C-2V, 5C-FB
3C-2V: 300m
Overall distance
5C-2V, 5C-FB: 500m
Distance between 3C-2V: 300m
stations 5C-2V, 5C-FB: 500m
Error control system
CRC(X
• Diagnostic function for checking local link lines
• Prevention of system down by switching the control station
RAS function • Abnormal detection using link special relays and link special
registers
• Network monitoring and various diagnostic functions
• N:N communication (e.g. monitor, program up/download)
Transient transmission
• Dedicated link instruction
Number of occupied I/O 32 points per slot (I/O assignment:
points special 32 points)
4
- 7
Specifications
AJ71BR11 AJ71QBR11
A1SJ71QBR11
2000 bytes
239 (Total number of PLC to PLC networks
and remote I/O networks)
16 12 5
+ X + X + 1) and retry by a time over
: Compatible,
Compatibility
QJ72LP21G
(MELSECNET/10 mode)
32 points per slot (I/O
assignment: intelli. 32
points)
: Partial change required, ×: Incompatible
Precautions for replacement
Network No.240 to No.250
cannot be set.
Alternate them with unused
network No.
For comparison of dedicated
link instruction, refer to
Section 4.6.2.