Performance Specifications Comparisons; Module Performance Comparisons Incompatible - Mitsubishi Electric MELSEC-A Series Manual

4
REPLACEMENT OF THE MELSECNET/10 (PLC TO PLC NETWORK)

4.2 Performance Specifications Comparisons

4.2.1 Module performance comparisons incompatible

(1) Performance comparison of AJ71LP21/A1SJ71LP21/AJ71QLP21/A1SJ71QLP21 and
QJ71LP21-25 (MELSECNET/10 mode)
Item
A1SJ71LP21
Maximum
LX/LY 8192 points
number of link
LB 8192 points
points per
LW 8192 points
network
Maximum number of link
{(LY + LB)  8 + (2 × LW)}
points per station
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 PLC
Maximum number of
networks and
networks
remote I/O
networks)
Maximum number of
9
groups
Number of stations
64 stations (Control station: 1, normal station: 63)
connected in one network
SI optical cable, H-PCF optical cable, Broad-band H-PCF optical
Applicable cable
cable, and QSI optical cable
Overall distance 30km
Distance between SI optical cable: 500m, H-PCF optical cable: 1km, Broad-band H-
stations 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
• Prevention of system down by switching the control station
RAS function
• Abnormal detection using link special relays and link special
registers
• Network monitoring and various diagnostic functions
• N:N communication (e.g. monitor, program up/download)
Transient transmission
• Dedicated link instruction
Number of occupied I/O 32 points per slot (I/O assignment:
points special 32 points)
Specifications
AJ71LP21 AJ71QLP21
A1SJ71QLP21
2000 bytes
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,
Compatibility
QJ71LP21-25
MELSECNET/10 mode)
32 points per slot (I/O
assignment: intelli. 32
points)
: Partial change required, ×: Incompatible
Precautions for replacement
Network No.240 to No.255
cannot be set.
Alternate them with unused
network No.
For comparison of dedicated
link instruction, refer to
Section 4.6.2.
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