Mitsubishi Electric MELSEC-A Series Manual page 171

5
REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
2) Performance comparison of AJ71QLP21S/A1SJ71QLP21S and QJ71LP21S-25
Item
LX/LY
Maximum number of
LB
link points per network
LW
Maximum number of link points
per station
Communication speed
Communication method
Synchronous type
Encoding method
Transmission method
Transmission format
Maximum number of networks
Number of stations connected in
one network
Applicable cable
Overall distance
Distance between stations
Error control system
RAS function
Transient transmission
Voltage
Current
External power supply
Applicable
cable size
Specifications
AJ71QLP21S
A1SJ71QLP21S
8192 points
8192 points
16384 points
8192 points
16384 points
<Remote master station  remote
I/O station>
{(LY + LB)  8 + (2 × LW)}
<Remote master station  remote
bytes
I/O station>
<Remote I/O station  remote
{(LY + LB)  8 + (2 × LW)}
1600
master station>
bytes
{(LY + LB) 8 + (2 × LW)}
<Remote I/O station  remote
bytes
master station>
<Multiplexed remote master
{(LY + LB) 8 + (2 × LW)} 1600
station  multiplexed remote
bytes
sub-master station>
{(LY + LB)  8 + (2 × LW)}
bytes
10Mbps 25Mbps/10Mbps
Token ring method
Frame synchronization method
NRZI coding (Non Return to Zero Inverted)
Duplex loop
HDLC standards (frame format)
239 (Total number of PLC to PLC networks and remote I/O networks)
65 stations (Remote master station: 1, remote I/O station: 64)
SI optical cable, H-PCF optical cable, Broad-band H-PCF optical
cable, and QSI optical cable
30km
<10Mbps>
SI optical cable: 500m, H-PCF
optical cable: 1km, Broad-band H-
PCF optical cable: 1km, and QSI
SI optical cable: 500m, H-PCF
optical cable: 1km, Broad-band H- optical cable: 1km
PCF optical cable: 1km, and QSI <25Mbps>
optical cable: 1km
SI optical cable: 200m, H-PCF
optical cable: 400m, Broad-band
H-PCF optical cable: 1km, and
QSI optical cable: 1km
16 12 5
CRC (X +X +X +1) and retry by a time over
• 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
• Monitor, program up/download
with peripheral device
• Available for Intelligent function
module
• Dedicated link instruction
20.4VDC to 31.2VDC
0.2A
2
0.75 to 2mm 0.3 to 1.25mm
: Compatible,
Compati-
QJ71LP21S-25
*1
*1
*2
1600
*2
1600
2000
*3
• 1:1 communication (Monitor,
program up/download)
• Dedicated link instruction
2
: Partial change required, × : Incompatible
Precautions for replacement
bility
Use 10 Mbps when using SI optical
cable and HPCF optical cable.
For comparison of dedicated link
instruction, refer to Section 5.1.7.
2
Cables of 1.25mm or more should be
replaced with cables of 0.3 to 1.25mm.
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