num parameter manual - Documentation CN

9.12 Maximum Time Allocated to the PLC Application P99
Description
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Category Miscellaneous
Type 5 Unsigned decimal
No. of words 1
Defines the maximum time allocated to the PLC application for a system equipped with the UC SII central processing
unit.
Word N0
Used to define the maximum time allocated to the PLC for the customer PLC programme application. This time is
expressed in ms. The default value is 10 ms.
REMARK: For P99 to operate correctly, word N0 must be higher than word N0 of P50. The
default value is twice as high.
The maximum time cannot be less than 4 ms nor greater than 14 ms. It must be a multiple of 2 ms. Values outside
these limits are forced to the limit values.
The time must be set to the minimum value allowing execution of the sequential tasks but no greater than necessary
so as to prevent the background tasks from penalising analysis of the part programmes.
Setting the Time Allocated to the PLC Application
Two cases can occur:
- If there are no background tasks, set P99 to the minimum value required to prevent the PLC from going into fault
status (the sequential tasks must be executed cyclically). The extra time will be allocated to the CNC.
- If there are background tasks, set P99 to the minimum value required to prevent the PLC from going into fault status
then increase P99 if necessary to improve the time allocated to the PLC background tasks (transparent mode).
Word N1
Not significant
! CAUTION
Setting a higher value than necessary can degrade the CNC performance (block
preparation time and maximum speed).