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S7-300 Automation Systems, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
13-3
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--> Communication processor
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Central processing unit of the S7 programmable controller with open and closed-
loop control systems, memory, operating system and interface for programming
device.
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The CPU OS organizes all functions and processes of the CPU which are not
associated to a specific control task.
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The term cycle time describes the time required by a Æ CPU to run through a
Æ user program on
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Data blocks (DB) are data areas in the user program which contain user data.
Global data blocks can be accessed by all code blocks while instance data blocks
are assigned to a specific FB call.
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Static data is data which can only be used within a function block. The data is
saved in an instance data block belonging to the function block. The data stored in
the instance data block is retained until the next function block call.
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Temporary data is local data of a block that is stored in the L stack during block
execution and no longer available after execution.
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Æ Interrupt, Delay
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The diagnostic buffer is a buffered memory area in the CPU in which diagnostic
events are stored in the order of their occurrence.
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