Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 58

3 SPECIFICATIONS
Item
LX/LY
Maximum number of
LB
link points per network
LW
Maximum number of link points per station
1
Communication speed
Number of stations per network
Connection cable
Overall distance for one network
Maximum number of networks
Maximum number of groups
Transmission path format
Communication method
Synchronous method
Encoding method
Transmission format
Error control system
RAS function
Transient transmission
Special cyclic transmission function
Number of occupied I/O points
Internal current consumption (5V DC)
H
External dimensions W
D
Weight
1 The number of LY points of the stations set in the I/O master station is the sum total of the LY points for output to all stations within the block.
2 This value is set as default of the communication speed.
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(3) Performance specifications of the twisted bus system
• MELSECNET/H mode
{(LY + LB) / 8 + (2
• MELSECNET/H Extended mode
{(LY + LB) / 8 + (2
156kbps/312kbps/625kbps/1.25Mbps/2.5Mbps/5Mbps/10Mbps (Switched by network parameters)
Communication
speed
156kbps 2
312kbps
625kbps
1.25Mbps
2.5Mbps
5Mbps
10Mbps
• Diagnostic function of host link line check
• Prevention of system down by switching the control station
• Abnormal detection using link special relays and link special registers
• N:N communication (monitor, program upload/download, etc.)
• Various send/receive instructions from sequence programs (ZNRD/ZNWR, SEND/RECV, RECVS,
READ/WRITE, SREAD/SWRITE, REQ, RRUN/RSTOP, RTMRD/RTMWR.)
• Send function addressed to logical channel number of channel numbers 1 to 8
• Low-speed cyclic transmission function
Twisted bus system
QJ71NT11B
8192 points
16384 points
16384 points
LW)}  2000 bytes
LW)}  35840 bytes
Up to 32 stations (1 control station, 31 normal stations)
Shielded twisted pair cable or CC-Link Ver.1.10-compatible cable
Shielded twisted pair cable
1200m
600m
400m
200m
(Not applicable)
239
32
Bus (RS-485)
Token bus
Frame synchronous
Manchester code
Conforms to HDLC (frame type)
16
Retries based on CRC (X
32 points (I/O assignment: intelli.; 32 points)
0.6A
98mm
27.4mm
90mm
0.13kg
CC-Link Ver.1.10-compatible cable
1200m
900m
600m
400m
200m
150m
100m
12 5
+ X + X + 1) and timeover
MELSEC-Q
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