Mitsubishi Electric Melsec A Series - Page 180

REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
5 - 14
5
3) Performance comparison of AJ72LR25/AJ72QLR25/A1SJ72QLR25 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 A1SJ72QLP25, 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 64 stations of the remote I/O station is used for the multiplexed
remote sub-master station.
*6 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
AJ72LR25
AJ72QLR25
A1SJ72QLR25
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 ring method Token bus method
Nothing to be noted though the
communication method differs.
Synchronous type Frame synchronization method
Encoding method Manchester code
Transmission method Duplex loop Single bus
The loopback function and
multiplex transmission function
cannot be used on a coaxial bus
system. To use the functions,
using an optical loop system is
recommended.
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
65 stations (Remote master station: 1, remote
I/O station: 64)
*5
33 stations (Remote master
station: 1, remote I/O station:
32)
*6
Remote I/O stations up to 32
stations can be used on a coaxial
bus system. To use 33 remote I/O
stations or more, using an optical
loop system is recommended.
Applicable cable 3C-2V, 5C-2V, 5C-FB
Overall distance
3C-2V: 19.2km
5C-2V, 5C-FB: 30km
3C-2V: 300m
5C-2V, 5C-FB: 500m
Either use an A6BR10/A6BR10-
DC type repeater unit, or use an
optical loop system.
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
• Diagnostic function for
checking local link lines
• Abnormal detection using
link special relays and link
special registers
• Network monitoring and
various diagnostic
functions
The loopback function cannot be
used on a coaxial bus system. To
use the loopback function, using
an optical loop system is
recommended.
Transient transmission
• Monitor, program up/download with
peripheral device
• Dedicated link instruction
• 1:1 communication
(Monitor, program up/
download)
• Dedicated link instruction
For comparison of dedicated link
instruction, refer to Section 5.1.7.