Mitsubishi Electric Melsec A Series - Page 205

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REPLACEMENT OF THE MELSECNET/10 (REMOTE I/O NETWORK)
5
(2) Comparison of AJ72LP25G/AJ72QLP25G and QJ72LP25G (MELSECNET/10 mode)
: Compatible, : Partial change required, × : Incompatible
Item
Specifications
Compatibility Precautions for replacement
AJ72LP25G AJ72QLP25G
QJ72LP25G
(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
<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
Maximum number of I/O
points per remote I/O station
X + Y 2048 points X + Y 2048 points
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.250 cannot
be set. Replace them with unused
network No.
Number of stations connected
in one network
65 stations (Master station: 1, remote I/O station: 64)
Applicable cable GI optical cable
Overall distance 30km
Distance between stations GI optical cable: 2km
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 disconnection of a cable
Diagnostic function for checking local link lines
Abnormal detection using the link special relay and link special register
Network monitoring and various diagnostic functions
Transient transmission
Monitoring, program up/download with a peripheral device
Dedicated link instruction
For comparison of dedicated link
instructions, refer to Section 5.1.7.