Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario descargar pdf (Pagina 102)

Programming Techniques

Chapter 5

5-21

Figure 5.7

Sending

a Message at Switchover

| B1:0 S0:3 +MSG–––––––––––––––––––––––––+

+––] [–––] [–––––––––––––––––––––––––––––––+MESSAGE

+–(EN)–+

| 00 17 |Control #B200:1|

| |Channel E2.5.1+–(DN)

| |#H045$N4:17=$B3:5 |

| | +–(ER)

| | |

| +––––––––––––––––––––––––––––+

Bit B1:0/00 is an internal storage bit used to control execution of the

transfer command. You can use any unused data table bit for this purpose. Bit

S0:3/17 is the run/backup bit.

Automatic Switchover

The following information applies if you selected Data Highway and

configured your PLC-3 backup system for automatic switchover.

At switchover,

the data highway port is disabled on the communication adapter module

in the primary processor

the station addresses of the Data Highway and modem ports on the

communication adapter module in the backup processor change to those

selected in LIST

Table 5.H lists the conditional responses that can occur with automatic

switchover.

Table 5.H

Automatic

Switchover Responses

Switchover occurs and: Then:

the processor is waiting for a response the response is ignored.

1 2 ... 97 98 99 100 101 102 103 104 105 106 107 ... 118 119

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Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Manual de usuario Pagina 102