Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 57

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
Applicable connector
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 Some restrictions are applied to the cable length between stations depending on the number of stations connected. Refer to section 4.6.2 for details.
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(2) Performance specifications of the coaxial bus system
• MELSECNET/H mode, MELSECNET/10 mode
{(LY + LB) / 8 + (2
• MELSECNET/H Extended mode
{(LY + LB) / 8 + (2
3C-2V
5C-2V
5C-FB
Can be extended up to 2.5km with the use of a repeater unit (A6BR10, A6BR10-DC.)
• 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
Coaxial bus system
QJ71BR11
8192 points
16384 points (8192 points in the MELSECNET/10 mode)
16384 points (8192 points in the MELSECNET/10 mode)
LW)}  2000 bytes
LW)}  35840 bytes
10 Mbps
Up to 32 stations (1 control station, 31 normal stations)
Coaxial cable (obtained by user)
Connector plug for 3C-2V
Connector plug for 5C-2V
Connector plug for 5C-FB
(obtained by user)
239 (total including remote I/O networks)
32 (9 in the MELSECNET/10 mode)
Single bus
Token bus
Frame synchronous
Manchester code
Conforms to HDLC (frame type)
16
Retries based on CRC (X + X
32 points (I/O assignment: intelli.; 32 points)
0.75A
98mm
27.4mm
90mm
0.11kg
MELSEC-Q
300m 2
500m 2
500m 2
12 5
+ X + 1) and timeover
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