ABB 3HAC045759-001
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The backup unit's status is updated each time the primary unit passes a rollback point, enabling the backup unit to resume program execution from the last rollback point passed, should the primary unit fail due to error.
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 3HAC045759-001
3HAC045759-001 | ABB | Interface Module
The RAM included in the processor unit provides an automatic double inverted memory function for detection of arbitrary bit errors in the memory.
• All memory updates are written to both the primary memory and to the inverted memory in parallel.
| ABB | ||
| NINT44 NINT 44 | 3HAC4790-1 | |
| HITE303166R1 HITE515100 IDB761A | 3HAC10602-1 | |
| HESG330086R64 HE693116-307 | 3HAC10601-1 | |
| SAMC11POW SAMC 11 POW | 3HAC10602-2 | |
| SAFT181INF SAFT 181 INF | SDCS-PIN-41A 3BSE004939R1 | |
| SAFT188IOC SAFT 188 IOC | SDCS-PIN-48 3BSE004939R0002 | |
| SNAT7261MGK SNAT0205BDB | YPK112A 3ASD573001A13 | |
| SAFT103CON 57777290 SAFT 400F380E 57778865 | YPP110A 3ASD573001A1 | |
| SAFT171PAC SAFT 171 PAC | SDCS-IOB-21 3ADT220090R0014 | |
| SAFT103CONB SAFT315F380 | SAMC 5 PRO SAMC5PRO 57149868QG | |
| SAFT185TBC SAFT 185 TBC | SAMC 7 REL SAMC7REL 57172509KE | |
| SAFT172POW SAFT 172 POW | SAMC 7 REL SAMC7REL 57172509LE | |
| SNAT7261NBN SNAT1005BDB | GHG125 2011F1106 A2141 | |
| SNAT7261SCP SNAT2105BDB | AO2000 AO2040 | |
| SAFT103CON SAFT 103 CON | GHG125 2021F1106A2140 | |
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