Siemens SINUMERIK 828D Function Manual page 38

Detailed description
2.3 System variables for synchronized actions
Activation
The system variables contain only valid values when the following applies:
MD11510 $MN_IPO_MAX_LOAD > 0 (maximum permissible interpolator utilization)
Note
The variables always contain the values of the previous interpolator cycle.
Overload limit
An overload limit can be set via the following machine data:
MD11510 $MN_IPO_MAX_LOAD = <maximum permissible utilization in %>
If the value set in the machine data is exceeded, the 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.
Resetting of min./max. values
The following system variables for min./max. values are reset by writing arbitrary values:
System variables
$AN_SERVO_MAX_LOAD
$AN_SERVO_MIN_LOAD
$AN_IPO_MAX_LOAD
$AN_IPO_MIN_LOAD
$AN_SYNC_MAX_LOAD
$AC_SYNC_MAX_LOAD
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Meaning
Longest computing time of the position controller
Shortest computing time of the position controller
Longest computing time of the interpolator level
(incl. synchronized actions of all channels)
Shortest computing time of the interpolator level
(incl. synchronized actions of all channels)
Longest computing time for synchronized actions
over all channels
Longest computing time for synchronized actions
in the channel
Function Manual, 07/2012, 6FC5397-5BP40-3BA0
Synchronized actions