Siemens SINUMERIK 840D sl Function Manual page 643

System variable (channel-specific)
$AC_OLD_PROG_NET_TIME_COUNT
$AC_PROG_NET_TIME_TRIGGER
All system variables are reset to 0 as a result of POWER ON!
Note
Residual time for a workpiece
If the same workpieces are produced one after the other, then from the timer values:
● Processing time for the last workpiece produced (see $AC_OLD_PROG_NET_TIME)
and
● Current processing time (see $AC_ACT_PROG_NET_TIME)
the remaining residual time for a workpiece can be determined.
The residual time is displayed on the user interface in addition to the current processing time.
Basic Functions
Function Manual, 01/2015, 6FC5397-0BP40-5BA2
K1: Mode group, channel, program operation, reset response
Description
Changes to $AC_OLD_PROG_NET_TIME
After POWER ON, $AC_OLD_PROG_NET_TIME_COUNT is at "0".
$AC_OLD_PROG_NET_TIME_COUNT is always increased if the control has
newly written to $AC_OLD_PROG_NET_TIME.
If the user terminates the running program with RESET,
$AC_OLD_PROG_NET_TIME and $AC_OLD_PROG_NET_TIME_COUNT re‐
main unchanged.
With $AC_OLD_PROG_NET_TIME_COUNT it can thus be ascertained, wheth‐
er $AC_OLD_PROG_NET_TIME was written.
Example:
If two programs running consecutively have the same runtime and were ended
correctly, then the user can identify this via the changed value in
$AC_OLD_PROG_NET_TIME_COUNT.
Trigger for the selective measurement of program sections.
The function is triggered by the writing of the value to the variable:
Val‐ Function
ue
0 Not active
1 Terminates the measurement
● $AC_OLD_PROG_NET_TIME = $AC_ACT_PROG_NET_TIME
● $AC_ACT_PROG_NET_TIME = 0 and then continues to run
2 Starts the measurement
● $AC_ACT_PROG_NET_TIME = 0
● $AC_OLD_PROG_NET_TIME is not changed
3 Stops the measurement
● $AC_OLD_PROG_NET_TIME is not changed
● $AC_ACT_PROG_NET_TIME is not changed
4 Continues the stopped measurement
● $AC_ACT_PROG_NET_TIME continues to run
● $AC_OLD_PROG_NET_TIME is not changed
9.18 Program runtime / part counter
643