Delta AS Series Programming Manual page 551

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9. The timers T0–T411 are defined as general timers, and T412–T511 are subroutine timers by default. Use the
hardware configuration software HWCONFIG if you need to change the ranges of the two types of timers.
10. The general timers compare the timing values when the TMR instruction is scanned. The system applies the timer
to the condition every time the TMR instruction status is scanned.
For the subroutine timers, the system counts the time and compares the timing values after the END instruction is
executed. Use subroutine timers when the TMR instruction is executed not in every scan, but you need longer lasting
timing and comparing.
Example 1 (using general type of counter; counts for 100 ms time window)
When X0.0 is ON, the instruction loads the setting value 50 to the timer T0, and T0 counts from 0 to 50. When the value
of T0 matches 50, the contact of T0 is ON.
Example 2 (using accumulative type of counter; counts for 100 ms time window)
When X0.0 is ON, the instruction loads the setting value 50 to the timer ST0. When the value of T0 is 25 and X0.0
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switches from OFF to ON, then T0 counts up from 25 to 50, and the contact of T0 is ON (accumulative).
Example 3 (using general type of counter; counts for 1 ms time window)
When X0.0 is ON, the instruction loads the setting value 1000 to the timer T5, and T5 counts up from 0 to 1000, and the
contact of T5 is ON.
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