Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Uživatelský manuál stáhnout pdf (Strana 57)

Using the 1775MX

Memory Communication Module

Chapter 4

4-10

Data

able T

ransfer Command

The DATA TABLE XFER command lets you transfer all of the data table

sections except the status section (section 13), from the primary processor

to the backup processor continuously. The memory communication module

transfers all undefined sections, i.e., 14, 15, and so on, as well.

The primary processor must be in run mode or test mode for transfers to

occur. If you switch the primary processor to program mode, data table

transfer becomes inactive.

The memory communication module forces the data table in the backup

processor to be identical to the one in the primary processor. Thus,

deletions as well as creations may take place in the backup processor.

Further, if a section of the data table exists in the backup processor but not

in the primary processor, that section will be deleted in the backup

processor.

LIST commands INACTIVE, FILE TRANSFER, and DATA TABLE

XFER are mutually exclusive, i.e., only one may be used at a time.

CAUTION: To guard against damage to equipment, make sure

there is sufficient memory available in the backup processor to

accommodate the data when the memory communication

module (1775-MX) executes a data table transfer. If not enough

memory is available, the backup processor will shut down.

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Rockwell-automation 1775-MX_S4A,D17756.3.1 User Manual PLC-3 BACKUP CO Uživatelský manuál Strana 57