Mitsubishi Electric Melsec A Series - Page 181

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REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
5
4) Performance comparison of AJ72BR15/AJ72QBR15/A1SJ72QBR15 and QJ72BR15
: Compatible, : Partial change required, × : Incompatible
*1 Remote master station  remote sub-master station, remote I/O station: 8192 points
Remote sub-master station, remote I/O station  remote master station: 8192 points
*2 The remote master station includes the multiplexed remote master station and multiplexed remote sub-master station.
*3 When the X/Y numbers are duplicate, one side only is taken into consideration.
*4 For the A1SJ72QBR15, the maximum number of I/O points per remote I/O station is "X + Y 1024 points".
*5 For the multiplexed remote I/O network, one station in 32 stations of the remote I/O station is used for the multiplexed
remote sub-master station.
Item
Specifications
Compatibility Precautions for replacement
AJ72BR15
AJ72QBR15
A1SJ72QBR15
QJ72BR15
Maximum number
of link points per
network
LX/LY 8192 points
LB 8192 points
16384 points
*1
LW 8192 points
16384 points
*1
Maximum number of link
points per station
<Remote master station  remote I/O station>
*2
{(LY + LB) 8 + (2 × LW)} 1600 bytes
<Remote I/O station  remote master station>
*2
{(LY + LB) 8 + (2 × LW)} 1600 bytes
Maximum number of I/O
points per remote I/O station
X + Y 2048 points X + Y 2048 points
*4
X + Y 4096 points
*3
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)
Maximum number of
networks
255 (Total number of
PLC to PLC networks
and remote I/O
networks)
239 (Total number of PLC to PLC networks and
remote I/O networks)
Network No.240 to No.250 cannot
be set. Alternate them with
unused network No.
Number of stations connected
in one network
33 stations (Remote master station: 1, remote I/O station: 32)
*5
Applicable cable 3C-2V, 5C-2V, 5C-F B
Overall distance
3C-2V: 300m
5C-2V, 5C-FB: 500m
Distance between stations
3C-2V: 300m
5C-2V, 5C-FB: 500m
Error control system
CRC (X
16
+X
12
+X
5
+1) and retry by a time over
RAS function
• Loop-back function due to error detection or broken cable
• Diagnostic function for checking local link lines
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions
Transient transmission
• Monitor, program up/download with
peripheral device
• Dedicated link instruction
• Available for Intelligent function module
(only AJ71QBR15/A1SJ72QBR15)
• 1:1 communication
(Monitor, program up/
download)
• Dedicated link instruction
For comparison of dedicated link
instruction, refer to Section 5.1.7.