Motion synchronous actions
10.3 Main run variables for synchronized actions
Job planning
568 Programming Manual, 07/2010, 6FC5398-2BP40-0BA0
10.3.9 Timer variable ($AC_Timer[n])
Function
System variable $AC_TIMER[n] permits actions to be started after defined periods of delay.
Timer variable: Data type:REAL
$AC_TIMER[n]
Channel-specific timer of data type REAL
s
Unit in seconds
n
Index of timer variable
Setting timers
Incrementation of a timer variable is started by means of value assignment:
$AC_TIMER[n]=value
n : Number of time variables
value: Starting value (generally "0")
Stopping timers
Incrementation of a timer variable can be stopped by assigning a negative value:
$AC_TIMER[n]=-1
Reading timers
The current timer value can be read whether the timer variable is running or has been
stopped. After a timer variable has been stopped through the assignment of -1, the current
time value remains stored and can be read.
Example
Output of an actual value via analog output 500 ms after detection of a digital input:
Program code Comments
WHEN $A_IN[1] == 1 DO $AC_TIMER[1]=0
WHEN $AC_TIMER[1]>=0.5 DO $A_OUTA[3]=$AA_IM[X] $AC_TIMER[1]=-1
;
Reset and start timer
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