num parameter manual - Documentation CN

9.4 Sampling Period P50
Description
9 - 10 en-938818/8
Category Miscellaneous
Type 5 Unsigned decimal
No. of words 2
Defines the CNC sampling period and the sampling period for the QVN cards.
Word N0
Defines the CNC sampling period (T) in μs. The default value is 5000 μs.
The minimum sampling period accepted by the system is 2000 μs and the maximum is period is 20,000 μs. If the value
of P50 is outside these limits, the system forces the limit values.
Programme Parameter
Programme parameter E41005 is used to read the value of the sampling period.
Programme parameter E41007 gives the recommended value of the RTC in μs.
Differences Related to the UC SII CPU
The sampling period must be a multiple of 2 ms. The default value is 6 ms.
If the sampling period is not a multiple of 2 ms, the following message appears when the system is initialised:
WARNING : SAMPLING PERIOD
IS NOT A MULTIPLE OF 2 ms
The system operates normally, but the sampling period is rounded down to the next lower multiple of 2 ms.
Word N1
Defines the sampling period for all the QVN cards in the CNC rack. The range of permissible values is from 400 μs
to 1000 μs in steps of 50 μs.
Any value outside this range is limited to 400 μs or 1000 μs.
! CAUTION
The ratio of the CNC sampling period to the QVN sampling period must be an integer value.