AH500 Programming Manual B. The accumulative timer When the instruction TMR is executed, the accumulative timer begins to count. As the value of the timer matches the setting value, the output coil is ON. As long as users add the letter S in front of the letter T, the timer becomes the accumulative timer. When the conditional contact is OFF, the value of the accumulative timer is not reset. When the conditional contact is ON, the timer counts from the current value. When Ч 0.0 is ON, the timer T250 takes 100 milliseconds as the timing unit and counts up. As the current value of the timer matches the setting value 100, the output coil of T250 is ON.
When Ч 0.0 is OFF, the timer T250 stops counting and the current value of the timer remains unchanged. Not until Ч 0.0 is switched ON will the timer counts again. When the timer counts up from the current value to the setting value 100, the output coil of T250 is ON. C. The timer used in the function block T1920~T2047 are the timers which users can use in the functional block or the interrupt. When the instruction TMR or END is executed, the timer used in the functional block begins to count. As the value of the timer matches the setting value, the output coil is ON.
If the general-purpose timer is used in the functional block or the interrupt, and the functional is not executed, the timer can not count correctly. 2-52