Siemens CPU 313C Hardware And Installation Manual page 223

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To ground means to connect an electrically conducting component to the
grounding electrode (one or more conducting components which have a very good
contact with the earth) across a grounding system.
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The device master file (GSD file) stores all slave specific properties. The GSD file
format is specified in EN 50170,Volume 2, PROFIBUS.
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A DB is automatically generated and assigned to every function block in the
67(3  user program. The values of the input, output and in/out parameters are
stored in the instance data block, together with local block data.
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The CPU's Æ operating system knows 10 different priority classes for controlling
user program execution. These priority classes include interrupts, such as process
interrupts. When an interrupt is triggered, the operating system automatically calls
an assigned OB. In this OB the user can program the desired response (for
example in an FB).
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The delay interrupt belongs to one of the priority classes when processing
programs in SIMATIC S7. It is started on expiration of a time generated in the user
program. A corresponding organization block is then executed.
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Æ Diagnostic interrupt
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Æ Process interrupt
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A status interrupt can be generated by a DPV1 slave and causes OB55 to be
called on the DPV1 master. For detailed information on OB55, see the 5HIHUHQFH
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S7-300 Automation Systems, Hardware and Installation: CPU 31xC and CPU 31x
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