Lenze PROFIBU PC-based Automation Manual de usuario Pagina 60

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Control technology | PROFIBUS communication manual
Defining the minimum cycle time of the PLC project
Calculating the minimum cycle time
60 L DMS 2.2 EN 07/2011 TD17
9.3 Calculating the minimum cycle time
The minimum cycle time T
min
for a system results from the sum of the times detected
before, multiplied by the safety factor:
Example
Note!
For calculating the minimum cycle time, a safety factor of 1.5 is included.
T
min
> safety factor x ( T
Task utilisation
+ T
Correction
)
Configuration: Industrial PC (ATOM 1.6 GHz) with 3 axes
Access time determined Result
Calculated correction value T
Correction
200 μs
(140 μs + 40 μs +(2 x 10 μs))
Value read from task configuration: T
Task utilisation
500 μs
Actual required computing time 700 μs
Minimum cycle time including a safety factor of 1.5 T
min
1050 μs
Actual cycle time 2000 μs
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