Mitsubishi Electric Melsec A Series - 4.2 Performance Specifications Comparisons; 4.2.1 Module performance comparisons incompatible

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REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)
4
4.2.1 Module performance comparisons incompatible
(1) Performance comparison of AJ71LP21/A1SJ71LP21/AJ71QLP21/A1SJ71QLP21 and
QJ71LP21-25 (MELSECNET/10 mode)
: Compatible, : Partial change required, ×: Incompatible
4.2 Performance Specifications Comparisons
Item
Specifications
Compatibility Precautions for replacement
AJ71LP21
A1SJ71LP21
AJ71QLP21
A1SJ71QLP21
QJ71LP21-25
MELSECNET/10 mode)
Maximum
number of link
points per
network
LX/LY 8192 points
LB 8192 points
LW 8192 points
Maximum number of link
points per station
{(LY + LB)  8 + (2 × LW)} 2000 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)
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.255
cannot be set.
Alternate them with unused
network No.
Maximum number of
groups
9
Number of stations
connected in one network
64 stations (Control station: 1, normal station: 63)
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
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
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special
registers
• Network monitoring and various diagnostic functions
Transient transmission
• N:N communication (e.g. monitor, program up/download)
• Dedicated link instruction
For comparison of dedicated
link instruction, refer to
Section 4.6.2.
Number of occupied I/O
points
32 points per slot (I/O assignment:
special 32 points)
32 points per slot (I/O
assignment: intelli. 32
points)