Rockwell-automation 5720 DriveLogix System Manual do Utilizador descarregar pdf (Página 236)

Publication 20D-UM002C-EN-P - November 2003

12-12 DriveLogix Back-Up on DeviceNet

Reading Back-up Status

You can read the back-up status of the DeviceNet scanner with a single rung

of ladder logic. The back-up state is useful for debugging or more

sophisticated back-up schemes. The message in this rung uses the SINT data

type.

Figure 11.7 shows the rung you can use to read the back-up state.

Figure 11.7

Table 11.1 describes the possible values this message may return when reading

the back-up status of the DeviceNet scanner.

Rung 6 message configuration and communication tabs

Table 11.2

If the message reads

this value:

the back-up state of the DeviceNet scanner is:

0 No back-up scanner detected

1 Primary scanner forcing IDLE (back-up in RUN but primary in

IDLE)

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