Kuhnke Electronics Instruction Manual
Kuhnke Electronics Instruction Manual
Kuhnke Electronics Instruction Manual
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4.4.1 Installing a Thread<br />
Function Libraries<br />
A thread is the executive part of a process with several<br />
threads being allowed to run at a time (parallel program).<br />
Thread properties:<br />
The operating system assigns a time slice of a defined<br />
size (in µs) to the program identified by its index and runs<br />
that program as a process. When the time slice comes to<br />
its end, the thread is terminated and the next process is<br />
run. It is the first thread's turn again when all other<br />
registered processes have been completed. The RUNS<br />
parameter allows you to restrict the number thread runs.<br />
When the count of runs is complete, the thread is killed<br />
and needs to be set up again if and when required.<br />
Parameter Type Value Explanation<br />
NPOU_Idparam WORD module index<br />
TSLICE WORD<br />
100..<br />
6500<br />
RUNS WORD 1..<br />
65553<br />
else 800µs<br />
size of time slice, in µs<br />
0 always<br />
number of runs<br />
Only one thread can run at exactly the same time. Your<br />
program should provide for just 1 program module being<br />
set up as a thread.<br />
Modules defined to be threads must not also be started<br />
directly by other parts of the program. You otherwise run<br />
the risk of producing incalculable program runs.<br />
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