Rockwell Automation 1785 PLC-5 Specifications download pdf (Page 35)

Options 33

1785-SO036C-EN-P - April 2002

Applying Backup Solutions Increasing system fault tolerance

ControlNet backup module

The ControlNet backup module provides backup of ControlNet I/O.

A secondary controller qualifies critical control information with the

primary controller. Both controllers consume information from

inputs and connect to outputs, but only the primary controller controls

the outputs. The secondary controller establishes control of outputs if

the primary controller shuts down.

The ControlNet backup module provides:

Backing up controller memory

EEPROM memory

You can back up program files using an EEPROM module.

This EEPROM module comes in four sizes:

Options

ControlNet PLC-5

Controller with 1785-CHBM

cartridge installed

PanelView 1000e/1400e

or other

Interface Device

ControlNet PLC-5

Controller with 1785-CHBM

cartridge installed

Redundant ControlNet Network

1794 FLEX I/O

1746 I/O

1771 I/O

AND/

30371-MC

Feature: Benefit:

high performance, deterministic delivery of I/O data The backup module supports standard features of ControlNet: high-speed data

transmission (5Mbps), user-selectable, deterministic delivery of remote I/O data.

execution of control programs in both the primary

and secondary controller

Both the primary and the secondary controller view remote inputs and continuously execute

their control program. Switchover time is faster because there is no need to crossload data

table information or control programs.

two selectable modes of backup operation Select:

• synchronous for a system where both controllers must keep as close as possible to

each other to minimize data table divergence.

• asynchronous for a system where application performance, such as program scan

times, must be optimized.

redundant cabling You have the option of wiring a second, or redundant, cable to all remote I/O nodes. Should

one cable break, the second cable will provide continued and uninterrupted transmission.

availability in 1771, 1746 or 1794 platforms Three offerings of I/O to choose or match the type to fit your hot backup application

If you want this amount of backup memory: Select:

16K words 1785-ME16

32K words 1785-ME32

64K words 1785-ME64

100K words 1785-ME100

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Rockwell Automation 1785 PLC-5 Specifications Page 35

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