Factory Automation

Controllers MELSEC-Q Series

Product features -Network-

MELSECNET/H network

MELSECNET/H network module

  • Optical loop type
    • QJ71LP21-25
    • QJ71LP21S-25
    • QJ71LP21G
    • QJ72LP25-25
    • QJ72LP25G (Remote I/O station)
  • Coaxial bus type
    • QJ71BR11
    • QJ72BR15 (Remote I/O station)
  • Twisted bus type
    • QJ71NT11B
  • MELSECNET/H network systems support controller-to-controller, controller-to-personal computer, and controller-to-remote I/O station communications. Multiple wiring types are available and many functions designed to increase reliability are included, such as support for redundant systems.
  • Optical loop type: Communication speeds up to 25 Mbps. Fiber optic cable is immune to EMI/RFI noise. Up to 2 km between stations using GI type cable.
  • Coaxial bus type: Using low cost coaxial cable allows networks to be constructed at less cost than optical loop networks.
  • Twisted bus type: The combination of an affordable network module and twisted-pair cables allows a network system to be built at very low cost.

[Optical loop system]

[Coaxial bus system]

[Twisted bus system]

■ Performance Specifications

Item Specification
Network configurations Optical loop system Coaxial bus system
Model QJ71LP21(S)-25
QJ72LP25-25		 QJ71LP21G
QJ72LP25G		 QJ71BR11
QJ72BR15
Cable Fiber optic (SI) Fiber optic (GI) Coaxial (3C-2V) Coaxial (5C-2V)
PLC to PLC network Maximum number of
link points per network		 LB 16384 points (8192 points in the MELSECNET/10 mode)
LW 16384 points (8192 points in the MELSECNET/10 mode)
LX/LY 8192 points
Maximum number of
link points per station
  • MELSECNET/H mode
    {(LY + LB) /8 + (2 x LW)} ≤ 2000 bytes
  • MELSECNET/H extended mode
    {(LY + LB) /8 + (2 x LW)} ≤ 35840 bytes
Number of stations per network Up to 64 stations
(1 control station, 63 normal stations)		 Up to 32 stations
(1 control station, 31 normal stations)
Remote I/O network Maximum number of
link points per network		 LB 16384 points
(Remote Master to Remote Sub-master or Remote I/O: 8192 points,
Remote Sub-master or Remote I/O to Remote Master: 8192 points)
LW 16384 points
(Remote Master to Remote Sub-master or Remote I/O: 8192 points,
Remote Sub-master or Remote I/O to Remote Master: 8192 points)
LX/LY 8192 points
Maximum number of
link points per station
  • Remote Master to Remote I/O ((LY + LB) /8 + (2 x LW)) ≤ 1600 bytes
  • Remote I/O to Remote Master ((LX + LB) /8 + (2 x LW)) ≤ 1600 bytes
  • Multiplexed Remote Master from/to Multiplexed Remote Sub-master
    ((LY + LB) /8 + (2 x LW)) ≤ 2000 bytes
Maximum I/O points
per remote I/O station		 X + Y ≤ 4096 points
If X/Y numbers are duplicated, 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
Number of stations per network Up to 65 stations (1 remote master station,
64 remote I/O stations)		 Up to 33 stations (1 remote master station,
32 remote I/O stations)
Communication speed 25 Mbps/10 Mbps 10 Mbps
Overall distance 30 km 300 m 500 m
Distance between stations Up to 1 km 2 km —
Item Specification
Network configurations Twisted bus system
Model QJ71NT11B
Cable Twisted pair CC-Link Ver. 1.10-compatible cable
PLC to PLC network Maximum number of
link points per network		 LB 16384 points
LW 16384 points
LX/LY 8192 points
Maximum number of
link points per station
  • MELSECNET/H mode
    {(LY + LB) /8 + (2 x LW)} ≤ 2000 bytes
  • MELSECNET/H extended mode
    {(LY + LB) /8 + (2 x LW)} ≤ 35840 bytes
Number of stations per network Up to 32 stations (1 control station, 31 normal stations)
Communication speed 156 kbps/312 kbps/625 kbps/1.25 Mbps/2.5 Mbps/5 Mbps/10 Mbps
Overall distance 1200 m/156 kbps,
600 m/312 kbps,
400 m/625 kbps,
200 m/1.25 Mbps		 1200 m/156 kbps,
900 m/312 kbps,
600 m/625 kbps,
400 m/1.25 Mbps,
200 m/2.5 Mbps,
150 m/5 Mbps,
100 m/10 Mbps