Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario descargar pdf (Pagina 14)

Choosing a Backup Configuration

Chapter 1

1-7

The three methods of switching control of outputs from the primary to the

backup processor are:

automatic switchover with no switchback

automatic switchover with controllable switchback

manual switchover

You can use any one of these methods for scanner backup, but you must

use automatic switchover with controllable switchback for MX backup.

Table 1.C lists the attributes associated with each method.

Table 1.C

Switchover

Method Attributes

Switchover

Method:

Attributes:

Automatic

Switchover with

No Switchback

 Backup processor automatically takes control of outputs when the primary

processor faults.

 No operator intervention required at switchover.

 Shutting off the primary processor initiates switchover.

 Both the primary and the backup processor must be shut down and

restarted when reinstalling a repaired processor.

 Not recommended for applications using multidrop modems with 1775KA

modules because the modem port is not disabled after a processor fault.

Automatic

Switchover with

Controllable

Switchback

 Backup processor automatically takes control of outputs when the primary

processor faults.

 No operator intervention required at switchover.

 Shutting off the primary processor initiates switchover.

 Either processor can be the primary" processor.

 The backup processor does not have to be shut down when reinstalling a

repaired primary processor.

 Not recommended for applications using multidrop modems with 1775KA

modules because the modem port is not disabled after a processor fault.

Continued

on Next Page

Choosing a Switchover

Method

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