Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario descargar pdf (Pagina 23)

Installing a Backup System

Chapter 2

2-8

Setting

Switch 2

The processor restart lockout switch (switch 2) must be ON so the backup

processor is capable of restarting the I/O chassis at switchover, if

necessary. If the system has more than one I/O chassis, switch 2 must be

ON in each chassis. For more detailed information about the processor

restart lockout feature, refer to the PLC-3 Programmable Controller

Installation and Operations Manual (publication 1775-6.7.1).

Setting

Switch 8

The chassis I/O to backup processor switch (switch 8) must be ON so the

backup processor can receive inputs from the I/O chassis. The backup

processor will not be able to receive inputs from the I/O chassis if switch 8

is set incorrectly.

CAUTION: To guard against damage to equipment, make sure

that switch 8 on a 1771-A1B I/O chassis with starting module

group 0 is set to ON. If this switch is not ON, the backup

processor will not receive inputs from the I/O chassis.

You set up and install scanner modules whether you are configuring a

system for scanner backup or MX backup. The only difference is the cable

used between the backup connectors on the various modules.

To configure a scanner module you must:

set backup switches

select a backup cable

connect the backup cable

connect I/O channel wiring.

Setting

Backup Switches

Each scanner module has four switches for selecting a switchover method

or stand-alone mode. Figure 2.5 and Figure 2.7 show the location of these

switches for the various scanner modules.

To select the backup mode, do the following:

1. Set backup switches 1 through 4 on the number one scanner module

(thumbwheel set to 1) in both primary and backup processors for the

type of switchover desired. See Table 2.A for 1775-S4A and 1775-SR

scanners or Table 2.B for 1775-S5 and 1775-SR5 scanners.

Configuring Scanner Modules

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 118 119

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Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario Pagina 23