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MELSEC-Q
1 OVERVIEW
POINT
(1) Use QCPU for MELSECNET/H remote I/O network PLC selection time.
(2) Remote I/O networks and PLC to PLC networks cannot be mixed on the same
MELSECNET/H network. Always build separate networks.
(3) Only MELSECNET/H network modules can be connected to a MELSECNET/H
remote I/O network. They cannot be mixed with MELSECNET/10 network
modules.
The following table shows the types of networks the CPU modules can be connected to.
Network to be connected
MELSECNET/10 MELSECNET/H
CPU module
Type of networks
that can be used
with CPU
PLC to PLC network Remote I/O network PLC to PLC network Remote I/O network
MELSECNET/H
(10 Mbps)
(MELSECNET/10 mode)
QCPU
MELSECNET/H
(25 Mbps)
(MESLECNET/H mode,
MELSECNET/H
Extended mode
1)
AnUCPU MELSECNET/10
QnACPU MELSECNET/10
: Can be used : Cannot be used
1: The MELSECNET/H Extended mode is inapplicable to the Redundant CPU.
1.2 Features
The MELSECNET/H remote I/O network has the following features.
(1) Achievement of a high-speed communication system
(a) High-speed data sending at a communication rate of 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)
and 16384 points for the link register (LW). (See 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
(maximum total extension of 30 km (98430 ft.)) which has a long station-to-
station distance and total distance, and is resistant to noise, or the coaxial
bus system (maximum total extension of 500 m (1640.5 ft.) which can easy
be wired.
(See Section 3.1, "Performance Specifications.")
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