Overview
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Type:
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Function
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Available as of:
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SystemInterface_1.32.6.0
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Versions:
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Current version
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Task
Measure time high-precisely.
Description
The function outputs the length of time for a processor timer cycle in ns. The value can be used to convert into ns the value that the function FC_GetTSC() returns.
Return Value
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Data type
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Description
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LREAL
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GetNsPerCPUClockCycle: Number of ns per processor clock cycle
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Example
Declaration
ulStartClock: UDINT;
ulEndClock: UDINT;
ulClock: UDINT;
lrTimeUs: LREAL;
Program
ulStartClock := FC_GetTSC();
: <zu messende Programmsequenz>
ulEndClock:= FC_GetTSC();
ulClock := ulEndClock - ulStartClock;
lrTimeUs:= UDINT_TO_LREAL(ulClock) * FC_GetNsPerCPUClockCycle() /1000.0;