Performance Specifications Comparisons - Mitsubishi Electric MELSEC-A Series Manual

5
REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)

5.1.2 Performance specifications comparisons

(1) Module performance comparisons
(a) Performance comparison of remote master station
1) Performance comparison of AJ71LP21/A1SJ71LP21/AJ71QLP21/A1SJ71QLP21 and
QJ71LP21-25
Item
LX/LY 8192 points
Maximum number
LB 8192 points
of link points per
network
LW 8192 points
<Remote master station 
remote I/O station>
{(LY + LB) 8 + (2 × LW)}
Maximum number of link 1600 bytes
<Remote I/O station 
points per station
remote master station>
{(LY + LB) 8 + (2 × LW)}
1600 bytes
Communication speed 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)
255 (Total number of PLC to
Maximum number of
PLC networks and remote I/
networks
O networks)
Number of stations connected
65 stations (Remote master station: 1, remote I/O station: 64)
in one network
SI optical cable, H-PCF optical cable, Broad-band H-PCF optical cable, and QSI
Applicable cable
optical cable
Overall distance 30km
SI optical cable: 500m, H-PCF optical cable: 1km,
Distance between stations Broad-band H-PCF optical cable: 1km, and QSI
optical cable: 1km
Error control system
CRC (X
• Loop-back function due to error detection or broken cable
• Diagnostic function for checking local link lines
RAS function
• Abnormal detection using link special relays and link special registers
• Network monitoring and various diagnostic functions
• Monitor, program up/download with peripheral
device
Transient transmission • Dedicated link instruction
• Available for Intelligent function module (only
AJ71QLP21/A1SJ71QLP21)
Specifications
AJ71LP21 AJ71QLP21
A1SJ71LP21 A1SJ71QLP21
<Remote master station  remote I/O station>
{(LY + LB) 8 + (2 × LW)}
<Remote I/O station  remote master station>
{(LY + LB) 8 + (2 × LW)}
<Multiplexed remote master station  multiplexed
remote sub-master station>
{(LY + LB)  8 + (2 × LW)}
239 (Total number of PLC to PLC networks and
remote I/O networks)
16 12 5
+X +X +1) and retry by a time over
: Compatible, : Partial change required, × : Incompatible
Compatibility Precautions for replacement
QJ71LP21-25
*1
16384 points
*1
16384 points
*2
1600 bytes
*2
1600 bytes
2000 bytes
25Mbps/10Mbps
*3
<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
• 1:1 communication
(Monitor, program up/
download)
• Dedicated link
instruction
Network No.240 to No.250
cannot be set. Alternate them
with unused network No.
Use 10 Mbps when using SI
optical cable and HPCF optical
cable.
For comparison of dedicated
link instruction, refer to Section
5.1.7.
5
- 3