Parallel operation with
long-running functions
The long-running functions "force" and ""program test" cannot
interrupt other functions and cannot be interrupted by other functions.
They can therefore not be executed parallel to other functions,
i.e. they are treated as a standard job "en bloc".
Parallel operation with
cyclic functions
Cyclic functions can be executed both parallel to other cyclic and to
short-running functions. The following example shows the standard
sequence of the "status variables" function.
PG 1
informs the CPU
of the variables
to be output.
PG 1 r equests the
current data
PG 1 r equests the
current data
PG 1 r equests the
current data.
PG 1 r equests the
current data.
PG 1 m ust wait until
the CPU is fr ee.
Job sent by PG 2 is pr ocessed
PG 2 m ust wait until
the CPU is fr ee.
PG 2 sends a job
PG 2 job com plete
CPU 948
User o n PG 1
User o n PG 2
Fig. 11-7
Typical sequence of a cyclic function and parallel short-running function
Parallel Operation of Two Serial PG Interfaces
CPU 948 Programming Guide
11 - 22
C79000-G8576-C848-04
Содержание CPU 948
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Страница 72: ...Data Blocks CPU 948 Programming Guide 2 42 C79000 G8576 C848 04 ...
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Страница 324: ...Examples of Parameter Assignment CPU 948 Programming Guide 7 18 C79000 G8576 C848 04 ...
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Страница 370: ...Addressable System Data Area CPU 948 Programming Guide 8 46 C79000 G8576 C848 04 ...
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Страница 404: ...Operations with the Base Address Register BR Register CPU 948 Programming Guide 9 34 C79000 G8576 C848 04 ...
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Страница 522: ...PG Functions via the S5 Bus CPU 948 Programming Guide 11 38 C79000 G8576 C848 04 ...
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Страница 546: ...List of Key Words CPU 948 Programming Guide Index 6 C79000 G8576 C848 04 ...