Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Uživatelský manuál stáhnout pdf (Strana 44)

Installation

Chapter 2

232

Figure 2.13

Example

of a Rung that Sends a Message during switchover from primary PLC-3 to backup

PLC-3.

MSG

MESSAGE TYPE

CTL = FB200:00001 = 0

CHANNEL: E2.5.

#H045$N4:17= $B3:5

E0000

S0003

STAT

E0000

S0003

NOTE:

Bits E0000/00 and E0000/01 are internal storage bits. You can use any unused data

table section to reference these bits. Bit S0003/17 is the run/backup bit.

Using Automatic Switchover

After you select the BACKUP OPERATION for a rev. D. (or later)

1775–KA module, you may want to use automatic switchover for your

PLC–3 backup system. During automatic switchover:

the 1775–KA module for the primary PLC–3 processor disables its

Data Highway port.

the 1775–KA module for the backup PLC–3 processor becomes the

address that you selected with the LIST function (rather than the

corresponding address it received during the BACKUP OPERATION).

NOTE: You cannot select the BACKUP OPERATION for a multidrop

modem applications because the modem port will not become disabled

after a PLC–3 processor fault regardless of the switch settings on the

module.

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Rockwell-automation 1775-KA PLC-3 Communication Adapter Module User Ma Uživatelský manuál Strana 44