Help with timers and counters in STEP7

The S7-200 CPU provides timers that count the number of 10-ms intervals that have elapsed since the active 10-ms timer was enabled. These timers are updated at the beginning of each scan by adding the accumulated number of 10-ms intervals (since the beginning of the previous scan) to the current value for the timer. Since the current value of an active 10-ms timer is updated at the beginning of the scan, the update is automatic. Once a 10-ms timer is enabled, execution of the timer’s controlling TON/TONR instruction is required only to control the enabled or disabled state of the timer. Unlike the 1-ms timers, a 10-ms timer’s current value is updated only once per scan and remains constant throughout a given execution of the main user program. A reset of an enabled 10-ms timer turns it off, resets its current value to zero, and clears its T-bit"
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