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CONNECT TIMER Statement
Purpose: Causes an INTEGER variable to start being updated as a millisecond clock
Syntax : CONNECT TIMER TO clock_var
where:
clock_var :a static, user-defined INTEGER variable
Details:
• clock_var is presently incremented by the value of the system variable $SCR.$COND_TIME
every $SCR.$COND_TIME milliseconds as long as the program is running or paused
and continues until the program disconnects the timer, ends, or aborts. For example, if
$SCR.$COND_TIM E=32 then clock_var will be incremented by 32 every 32 milliseconds.
• You should initialize clock_var before using the CONNECT TIMER statement to ensure a
proper starting value.
• If the variable is uninitialized, it will remain so for a short period of time (up to 32 milliseconds)
and then it will be set to a very large negative value (-2.0E31 + 32 milliseconds) and incremented
from that value.
• The program can reset the clock_var to any value while it is connected.
• A clock_var initialized at zero wraps around from approximately two billion to approximately
minus two billion after about 23 days.
• If clock_var is a system variable or a local variable in a routine, the program cannot be translated.
Note If two CONNECT TIMER statements using the same variable, are executed in two different
tasks, the timer will advance twice as fast. For example, the timer will be incremented by 2 *
$SCR.$COND_TIME every $SCR.$COND_TIME ms. However, this does not occur if two or
more CONNECT TIMER statements using the same variable, are executed in the same Task

DISCONNECT TIMER Statement
Purpose: Stops updating a clock variable previously connected as a timer
Syntax : DISCONNECT TIMER timer_var
where:
timer_var :a static, user-defined INTEGER variable
Details:
A–111
A. KAREL LANGUAGE ALPHABETICAL DESCRIPTION MARRC75KR07091E Rev D
• If timer_var is not currently connected as a timer, the DISCONNECT TIMER statement has
no effect.
• If timer_var is a system or local variable, the program will not be translated.
See Also: Appendix E , ‘‘Syntax Diagrams,’’ for additional syntax information, CONNECT TIMER
Statement
Example: The following example moves the TCP to the initial position in PR[1], sets the INTEGER
variable timevar to 0 and connects the timer. After moving to the destination position in PR[2], the
timer is disconnected.
DISCONNECT TIMER Statement
move_to_pr1 – Call TP program to move to PR[1]
timevar = 0
CONNECT TIMER TO timevar
move_to_pr2 – Call TP program to move to PR[2]
DISCONNECT TIMER timevar