Mitsubishi Electric Melsec A Series - Page 177

5 - 11
REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
5
(b) Performance comparison of remote I/O stations
1) Comparison between AJ72LP25/AJ72QLP25/A1SJ72QLP25 and QJ72LP25-25
: Compatible, : Partial change required, × : Incompatible
Item
Specifications
Compatibility Precautions for replacement
AJ72LP25
AJ72QLP25
A1SJ72QLP25
QJ72LP25-25
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>
{(LY + LB) 8 + (2 × LW)}
1600 bytes
<Remote I/O station 
remote master station>
{(LY + LB) 8 + (2 × LW)}
1600 bytes
<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 25Mbps/10Mbps
Communication method Token ring method
Synchronous type Frame synchronization method
Encoding method NRZI coding (Non Return to Zero Inverted)
Transmission method Duplex loop
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
Applicable cable
SI optical cable, H-PCF optical cable, Broad-band H-PCF optical cable, and QSI
optical cable
Overall distance 30km
Distance between stations
SI optical cable: 500m, H-PCF optical cable: 1km,
Broad-band H-PCF optical cable: 1km, and QSI
optical cable: 1km
<10Mbps>
SI optical cable: 500m,
H-PCF optical cable:
1km, Broad-band H-
PCF optical cable: 1km,
and QSI optical cable:
1km
<25Mbps>
SI optical cable: 200m,
H-PCF optical cable:
400m, Broad-band H-
PCF optical cable: 1km,
and QSI optical cable:
1km
Use 10 Mbps when using SI
optical cable and HPCF optical
cable.
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
AJ72QLP25/A1SJ72QLP25)
• 1:1 communication
(Monitor, program up/
download)
• Dedicated link
instruction
For comparison of dedicated
link instruction, refer to Section
5.1.7.