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MELSEC-Q
1 OVERVIEW
The following table shows the types of networks the CPU modules can be connected to.
CPU module
Type of networks
that can be used
with CPU
Network to be connected
MELSECNET/10 MELSECNET/H
PLC to PLC network Remote I/O network PLC to PLC network Remote I/O network
QCPU
MELSECNET/H
(10 Mbps)
(MELSECNET/10 mode)
(MESLECNET/H mode,
MELSECNET/H
Extended mode)
MELSECNET/H
(25 Mbps)
AnUCPU MELSECNET/10
QnACPU MELSECNET/10
: Can be used : Cannot be used
1.2 Features
The MELSECNET/H remote I/O network has the following features.
(1) Realization of a high-speed communication system
(a) High-speed data communication at 10 Mbps/25 Mbps is possible.
(25Mbps is available for only the optical loop type QJ71LP21-25,
QJ71LP21S-25 and QJ72LP25-25.)
(2) Large-scale and flexible system configuration
(a) The link device has a larger capacity: 16384 points for the link relay (LB),
16384 points for the link register (LW), and 8192 points for the link inputs
(LX)/link outputs (LY). (Refer to Section 2.1.3, "Available device range
settings.")
(b) A maximum of 4096 I/O points can be set for each remote I/O station.
The link points between a remote master station and a remote I/O station
can be set up to 1600 bytes. The link points of up to 2000 bytes can be set
between a master station and a sub-master station on a multiplexed remote
I/O network.
(c) Either of the following systems can be chosen: the optical loop system
which allows a long station-to-station distance and total distance (up to 30
km (98430 ft.)) and is resistant to noise, or the coaxial bus system
(maximum cable distance of 500 m (1640.5 ft.)) which can be wired easily.
(Refer to Section 3.1, "Performance Specifications.")