Siemens SINUMERIK 840D sl Function Manual page 39

Figure 3-1 Computing time shares of the synchronized actions on the interpolator cycle
Activation
The system variables only contain valid values when the "Utilization evaluation via
synchronized actions" diagnostic function is active.
For this, the following machine data must be greater than zero:
MD11510 $MN_IPO_MAX_LOAD > 0 (maximum permissible interpolator utilization)
When the function is active, the current values are displayed in the "Time required for
synchronized actions" line in the "Diagnostics" > "System utilization" operating area.
Note
The system variables always contain the values of the previous interpolator cycle.
Overload limit
An overload limit is specified via the value set via MD11510 $MN_IPO_MAX_LOAD:
MD11510 $MN_IPO_MAX_LOAD = <maximum permissible utilization in % of the interpolator
cycle>
If the value set in the machine data is exceeded, the following system variable is set:
$AN_IPO_LOAD_LIMIT = TRUE
If the value falls below the set value again, the system variable is reset:
$AN_IPO_LOAD_LIMIT = FALSE
Application
A user-specific strategy to avoid a level overflow can be implemented via the system variable
$AN_IPO_LOAD_LIMIT.
Synchronized actions
Function Manual, 08/2018, 6FC5397-5BP40-6BA2
3.3 System variables for synchronized actions
Detailed description
39