Siemens CPU 313C Hardware And Installation Manual page 224

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The time-of-day interrupt belongs to one of the priority classes in SIMATIC S7
program processing. It is generated depending on a specific date (or daily) and
time-of-day (e.g. 9:50 or hourly, or every minute). A corresponding organization
block is then executed.
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An update interrupt can be generated by a DPV1 slave and causes OB 56 to be
called on the DPV1 master. For detailed information on OB 56, see the 5HIHUHQFH
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A vendor-specific interrupt can be generated by a DPV1 slave. It causes OB57 to
be called on the DPV1 master.
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A watchdog interrupt is generated periodically by the CPU in a configurable time
pattern. A corresponding Æ organization block is then executed.
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Load memory is part of the CPU. It contains objects generated by the programming
device. It is implemented either as a plug-in Memory Card or permanently
integrated memory.
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Æ Data, temporary
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Work memory is a RAM memory in the Æ CPU accessed by the processor during
user program execution.
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Masters in possession of the Æ Token can send/request data to/from other nodes
(= active node).
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03