170AAI14000 SCHNEIDER Remote I/O controller

Use a Modicon Quantum Hot Standby with Unity system when downtime cannot be

tolerated. Hot standby systems deliver high availability through redundancy. A hot

standby system consists of two identical configurations.

Modicon Quantum 140 CPU 671 60

Modicon Quantum Power Supply Module

Modicon Quantum RIO Head

Modicon Optional Modules (NOE, NOM)

One of the 140 CPU 67160’s acts as the Primary controller, and the other acts as

the Standby controller. The Primary controller runs the application program and

operates the remote I/O.

Identical

Configurations

Two backplanes are configured with identical hardware and software.

One of the programmable logic controllers (PLCs) functions as the Primary

controller and the other as a Standby controller, and either controller can be put in

the Primary state, but the other must be in the Standby state or offline.

Primary and

Standby

Controllers

The Primary controller executes the application program, controls the remote I/O,

and updates the Standby controller after every scan (program cycle). If the Primary

controller fails, the Standby controller takes control within one scan. To determine if

the Primary controller failed, note controller’s status displayed in the HE CPU LCD

screen and the RIO Head’s status displayed by the RIO Head’s LEDs. (See

Troubleshooting the Primary, p. 133)

The Standby controller does not execute the full application program but only the

first section, and the Standby controller does not control the remote I/O but checks

out the availability of the Modicon Quantum Hot Standby with Unity equipment.

Switchover

Capability

Either of the two controllers may function as the Primary controller and the other as

the Standby controller.

Primary and Standby states are switchable.

Therefore, if one of the two controllers is functioning as the Primary controller, the

other must be in Standby mode. Otherwise, the second controller is in the default

mode, which is offline.

The remote I/O is always controlled by the Primary

Monitoring the

System

The Primary and the Standby controllers communicate with each other constantly to

monitor the functionality of the system.

If the Primary controller fails, the state of the controllers is switched.

The Standby controller becomes the Primary, executes the application program,

and controls the remote I/O.

If the Standby controller fails, the Primary controller continues to run without

redundancy and acts as a stand alone system.

Power Cycle

On power cycle, the controller that has the lowest MAC address will become the

Primary. The second system automatically becomes the Standby.

Handling I/O

Handling Local

I/O

Local I/O is not supported in a Modicon Quantum Hot Standby with Unity system

environment. However, local I/O can be configured and run but will not have any

corresponding backup.

Software

Requirements

Required to use a Quantum Modicon Hot Standby with Unity system:

Unity Pro 2.0 or higher

CRA firmware: Release 1.25 or higher

CRP firmware: Release 1.14 or higher

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