Mitsubishi Electric Melsec A Series - Page 171

5 - 5
REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
5
2) Performance comparison of AJ71QLP21S/A1SJ71QLP21S and QJ71LP21S-25
: Compatible, : Partial change required, × : Incompatible
Item
Specifications
Compati-
bility
Precautions for replacement
AJ71QLP21S
A1SJ71QLP21S
QJ71LP21S-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
<Multiplexed remote master
station  multiplexed remote
sub-master station>
{(LY + LB)  8 + (2 × LW)} 2000
bytes
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 239 (Total number of PLC to PLC networks and remote I/O networks)
Number of stations connected in
one network
65 stations (Remote master station: 1, remote I/O station: 64)
*3
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
• Available for Intelligent function
module
• 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.
External power supply
Voltage 20.4VDC to 31.2VDC
Current 0.2A
Applicable
cable size
0.75 to 2mm
2
0.3 to 1.25mm
2
Cables of 1.25mm
2
or more should be
replaced with cables of 0.3 to 1.25mm.