3.22 Program runtime/part counter
Information on the program runtime and workpiece counter is provided to support the machine
tool operator.
This information can be processed as system variables in the NC and/or PLC program. This
information is also available to be displayed on the operator interface.
3.22.1 Program runtime
The "program runtime" function provides internal NC timers to monitor technological
processes, which can be read into the part program and into synchronized actions via the NC
and channel-specific system variables.
The trigger for the runtime measurement ($AC_PROG_NET_TIME_TRIGGER) is the only
system variable of the function that can be written to – and is used to selectively measure
program sections. This means, by writing $AC_PROG_NET_TIME_TRIGGER in the NC
program, the time measurement can be enabled and disabled again:
System variable Meaning Activity
NC-specific
$AN_SETUP_TIME Time since the last control power up with default values
("cold restart") in minutes.
Is automatically reset to "0" every time the control pow‐
ers up with default values.
● Always active
$AN_POWERON_TIME Time since the last normal control power up ("warm
restart") in minutes.
Is automatically reset to "0" every time the control pow‐
ers up normally.
Channel-specific
$AC_OPERATING_TIME Total runtime of NC programs in automatic mode in
seconds.
The value is automatically reset to "0" every time the
control powers up.
● Activated via
MD27860
● Only AUTOMATIC
mode
$AC_CYCLE_TIME Runtime of the selected NC program in seconds.
The value is automatically reset to "0" every time a new
NC program starts up.
$AC_CUTTING_TIME Processing time in seconds
The runtime of the path axes (at least one is active) is
measured in all NC programs between NC start and
end of program/NC reset without rapid traverse active.
The measurement is interrupted when a dwell time is
active.
The value is automatically reset to "0" every time the
control powers up with default values.
Work preparation
3.22 Program runtime/part counter
NC programming
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0 983
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