Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Uživatelský manuál stáhnout pdf (Strana 12)

Choosing a Backup Configuration

Chapter 1

1-5

How MX Backup Works

Figure 1.3 shows the implementation of MX backup. The scanner modules

still control I/O communication channels but the memory communication

modules handle data transfers between the primary and backup processors.

Figure 1.3

Backup Configuration

CH1

SCANNER

MODULE

SCANNER

MODULE #1

B/U

CH1

CH2

CH3

CH4

B/U

CH1

CH2

CH3

CH4

PRIMAR

Y PROCESSOR

BACKUP PROCESSOR

I/O COMMUNICA

TION

PEERTOPEER

COMMUNICATION

I/O COMMUNICA

TION

CH2

CH3

TO/FROM

I/O

MEMORY

COMMUNICATION

MODULE

MEMORY

COMMUNICATION

MODULE

B/U

XMTG

RCVG

B/U

XMTG

RCVG

BACKUP COMMUNICA

TION

INTERCONNECT CABLE

TO/FROM

OTHER

PEERTOPEER

CHANNELS

10973I

1 2 ... 7 8 9 10 11 12 13 14 15 16 17 ... 118 119

Backup Systems 1
Important User Information 2
Table of Contents 3
Table of Contentsii 4
Manual Objectives 5
Audience 5
What This Manual Contains 5
WARNINGS, CAUTIONS and 6
Important Information 6
Terms and Conventions 6
Related Publications 7
Chapter 8
Chapter Objectives 8
Backup Concepts 8
Chapter 1 10
Configuration 11
Choosing a Backup 11
Choosing a Switchover 14
Installing a Backup System 16
Chapter 2 17
Power Supply Considerations 21
Grounding Considerations 21
Shielding Considerations 21
Configuring the I/O Chassis 22
Configuring Scanner Modules 23
Connecting the I/O 30
Channel Wiring 30
Configuring 1775MX Memory 39
Communication Modules 39
Operating a Backup System 41
Chapter 3 42
Figure 3.1 44
Table 3.B 45
Restarting 45
Procedure Selection 45
Using the 1775MX 48
Memory Communication Module 48
Table 4.A 49
Chapter 4 50
Using LIST Functions 50
Using Message Instructions 64
Error Codes 80
Timers and Counters at 83
Switchover 83
Timing Considerations at 84
Reducing Backup 87
Communication Overhead 87
Using Data Table Status Bits 90
Data Highway Plus 97
Programming Techniques 100
Chapter 5 100
Programming Considerations 103
Diagnosing Faults 105
Chapter 6 106
Locating a Fault 106
A Logic Diagnostic Routine 112

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