Detailed Description 
  2.12 Program runtime/workpiece counter 
Mode Group, Channel, Program Operation, Reset Response (K1) 
Function Manual, 08/2005 Edition, 6FC5397-0BP10-0BA0 
2-159 
NC-specific system variables 
The following NC-specific system variables are available:  
 
Names  Meaning  Description 
$AN_SETUP_TIME  Time since the last control powerup 
with default values ("Cold start" in min.) 
Counts the time since the last control powerup 
with default values.  
It is automatically reset to the default values each 
time the control is powered up.  
$AN_POWERON_TIME  Time since the last normal control 
powerup ("Warm start" in min.) 
Counts the time since the last normal control 
powerup.  
It is automatically reset to the default values on 
each normal control powerup.  
The timers of the system variables are always active. 
All system variables are reset to default values on each control power-up. 
Channelspecific system variables 
The following channel-specific system variables are available 
Several channel-specific system variables are available and can be activated via machine 
data. Each active runtime measurement is interrupted automatically by a program status 
"Program running" and an active override = ZERO.  
Dry run feedrate and program testing 
The behavior of the active time measurements during the functions: "Dry run feedrate" and 
"Program testing" can be specified via machine data. 
The following channel-specific system variables are available:  
 
Names  Meaning  Description 
$AC_OPERATING_TIME  Total runtime of NC programs in 
Automatic mode (in s) 
Totals the accumulated runtimes of all programs 
between NC Start and end of program/NC reset. 
It is automatically reset each time the control is 
powered up.  
$AC_CYCLE_TIME  Runtime of the selected NC program  
(in s; always only one active per 
channel) 
The runtime between the NC Start and the end of 
program/NC reset is measured in the selected NC 
program. 
It is reset automatically when a new NC program 
is started. 
$AC_CUTTING_TIME  Tool operating time (in s)  The measurement produces the runtime of the 
path axes (at least one is active) without active 
rapid traverse in all NC programs between NC 
Start and program end/NC reset with active tool. 
The measurement is also interrupted when a 
dwell time is active.  
It is automatically reset to the default values each 
time the control is powered up.