PP877K 3BSE069274R1 ABB Man machine touch screen operation screen

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Product Description

Product Description
PP877K 3BSE069274R1 ABB Man machine touch screen operation screen
PP877K 3BSE069274R1 ABB Man machine touch screen operation screen
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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.
If the primary unit fails because of an error, the backup unit resumes execution from
the last rollback point, which means the last execution unit is partially re-executed
by the backup unit. In order to re-execute a portion of the execution unit without
affecting the peripheral units (communication units on the CEX-Bus), the peripheral
units' references are also logged between rollback points. During re-execution, the
results of the peripheral units' references, which have already been executed, are
used, rather than re-executing them. 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.
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.
• At every memory read cycle, the data from tho two memories is compared.
• If there is a mismatch in the data a changeover is forced.
The double inverted memory handling is done in hardware and without any delay to
the memory cycle time.

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