Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Instrukcja Użytkownika Pobierz pdf (Strona 11)

Choosing a Backup Configuration

Chapter 1

1-4

There are two backup configurations:

scanner backup (Figure 1.2) which uses only I/O scanner modules

MX backup (Figure 1.3) which uses 1775-MX memory communication

modules

How

Scanner Backup W

orks

Figure 1.2 shows the implementation of scanner backup. The number one

scanner module controls switchover as well as backup, peer-to-peer, and

I/O communication channels.

Figure 1.2

Scanner

Backup Configuration

CH2

TO/FROM

OTHER

PEERTOPEER

CHANNELS

SCANNER

MODULE

SCANNER

MODULE #1

B/U

CH1

CH2

CH3

CH4

B/U

CH1

CH2

CH3

CH4

PRIMAR

Y PROCESSOR

BACKUP PROCESSOR

BACKUP CABLE

BACKUP COMMUNICA

TION

PEERTOPEER

COMMUNICATION

I/O COMMUNICA

TION

CH3TO/FROM

I/O

10972I

The data table of the backup processor can be updated in three ways.

The backup processor listens only to discrete real world inputs.

The input/output buffer transfers data files over the backup

communication cable. (You must program move and move file

instructions to transfer critical data table information.)

Data Highway or Data Highway Plus communication

Choosing a Backup

Configuration

1 2 ... 6 7 8 9 10 11 12 13 14 15 16 ... 118 119

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