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MELSEC-Q
3 SPECIFICATIONS
3.1.2 Coaxial cable system performance specifications
Table 3.2 lists the performance of the coaxial bus system.
Table 3.2 Coaxial cable system performance specifications
Item
Remote master station Remote I/O station
QJ71BR11 QJ72BR15
Maximum
number of links
per network
LX/LY 8192 points
LB
16384 points (Remote master station
remote sub-master station, remote I/O station: 8192 points, remote sub-master
station, remote I/O station
remote master station: 8192 points)
LW
16384 points (Remote master station
remote sub-master station, remote I/O station: 8192 points, remote sub-master
station, remote I/O station
remote master station: 8192 points)
Maximum number of links per
station
• Remote Master Station
Remote I/O station ((LY + LB)/8 + (2 LW)) 1600 bytes
1
• Remote I/O station Remote Master Station ((LX + LB)/8 + (2 LW)) 1600 bytes
• Multiplexed remote master station multiplexed remote sub-master station ((LY + LB) /8 + (2 LW)) 2000 bytes
Maximum I/O points per remote I/O
station
X + Y 4096 points
If the X/Y numbers are the same, only one side is taken into consideration.
Device points per
remote I/O
station
M 8192 points
SM 2048 points
D 12288 points
SD 2048 points
Communication speed 10 Mbps
Number of stations per network 33 stations (Remote master stations: 1 Remote I/O stations: 32)
2
Overall distance
3C-2V
300 m (Between stations 300 m)
3
5C-2V
500m (Between stations 500 m)
3
5C-FB
500m (Between stations 500 m)
3
Can be extended up to 2.5 km with the use of a repeater (A6BR10,A6BR10-DC)
Maximum number of networks 239 (Total including PLC to PLC networks)
Transmission path format Single layer bus
Communication method Token bus
Synchronization method Frame synchronization
Coding method Manchester code
Transmission format HDCL standards (Frame format)
Error control CRC (X
16
+ X
12
+ X
5
+ 1) and retry by timeover
RAS functions
• Station separation function due to error detection or cable disconnection
• Diagnostic function for checking local link lines
• Detection using link special relays or link special registers
• Configuring a redundant power supply on a remote I/O station
• Online module change in a remote I/O station
Application function • Remote password for remote I/O station
Transient transmission
• 1:1 communication (Monitor, program upload/download, etc.)
• Various send/receive commands from the programmable controller program (READ/WRITE,REMFR/REMTO)
Maximum number of modules per
CPU
4 modules —
Number of I/O points 32 points (Intelligent function module: 32 points) —
5 V DC internal current consumption 0.75 A 1.10 A
External dimensions 98 (3.86)(H) 27.4 (1.08)(W) 90 (3.54)(D) [mm (inch)]
Weight 0.11 kg 0.16 kg
1: The remote master station includes the multiplexed remote master station and multiplexed remote sub-master station.
2: On a multiplexed remote I/O network, one of 32 remote I/O stations works as a multiplexed remote sub-master station.
3: There are restrictions on the interstation cable length depending on the number of connected stations. Refer to Section 4.8.2 for
details.