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In order to minimize the amount of information involved in the update, the backup unit is updated only with the changes taking place since the latest rollback point.
Between rollback points, these changes that writes in the data memory, are stored in a log buffer in the backup unit. At a rollback point, the processor's total register contents are also written into the data memory, so that this information is also logged. Once the rollback point is established, the logged write operations are transferred to the backup unit's data memory.
ABB CI867KO1
CI867KO1 | ABB | Processor Module
The results of read operations are retrieved from the log, and write operations pass without execution, since they have already been executed. The peripheral units' statuses, then, are not affected by the reexecution in any way, except for the time delay which occurs.
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| ABB | ||||
| DSAX110 57120001-PC | DSPC172H | PM864A 3BSE018161R1 | ||
| PP835A | DSMB151 | 3BSE003195R1 SAMI GS | ||
| DSQC227 | 35AE92 | 3BSE008516R1 | ||
| DSQC 104 | IMDSO14 | 3BSE013230R1 | ||
| DATX130 3ASC25H214 | IMDSI14 | 3BSE020520R1 | ||
| DAPU100 3ASC25H204 | DSTA 180 | 3BSE020836R1 | ||
| 07KR264 | DSQC239 | 3BSE020924-510 B | ||
| DSSR170 48990001-PC | DSQC236G | 3BSE021447R1 | ||
| DSQC 363 | DSDO131 | 3BSE023675R1 | ||
| DSQC 335 | 1SAR3300020R0000 | 3BHE009017R0102 | ||
| DSMB116 | 07KT93 | 3BHE020959R0127 | ||
| DSBC111 | DSDO120 | CTB 811 | ||
| PU514 | DSBC 110 | HC 800 | ||
| DSTD132 | DAI04 | HAI 805 | ||
| DSQC373 | 07KT97(WT97) | HAO 805 | ||
| DSDP160 57160001-KG | SAMC19 INF 57401389 | MA12 | ||
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