2
SYSTEM CONFIGURATION
2.1 System Configuration
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(4) Communication via MELSECNET/H Remote I/O Network
(a) Controlling External Devices
A redundant system controls external devices using I/O modules and intelligent
function modules that are installed to remote I/O stations on the MELSECNET/H
remote I/O network.
Communications with external devices are also available by installing a
communication module to a remote I/O station, when it cannot be mounted on the
main base unit of the redundant system.
(b) Backup of Power Supply Module
The power supply module for each remote I/O station can be backed up.
By adding a backup power supply module to a remote I/O station, the remote I/O
station can continue to operate, even if an error occurs in either power supply
system, or if the power supply module fails.
This enables the faulty power supply system to be restored and power supply
modules that have failed can be replaced, even when the remote I/O station
power supply is on.
The power supply module can also be replaced for preventive maintenance, etc.
when the remote I/O station power supply is on.
