Chapter 5 Relay Ladder Logic Programming
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Timer Mode 7 (FLASH Cascade without Reset)
Mode 7 Timer is a Flash Timer which using two Timers in a cascade configuration without reset. The second
Timer number follows the first Timer. The cascade configuration connects the timer status bit of first timer to enable
the second timer. The second timer will time up to its preset value then flash and its timer status bit will enable the
first timer. Additionally, the Timer current value will reset to zero when Timer is disabled. In the example below,
timer status T01 will be ON after it completes its timing sequence of 2.5 seconds. Timer 2 will then begin its timing
sequence of 1 second. When the current time value of Timer 2 reaches its preset of 1 second, its status bit T02 will
flash and Timer 1 will begin timing again. This type of cascade timer is of ten used in combination with a counter in
applications where it is necessary to count the number of time cycles completed.
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Those t
wo timers of Timer Mode 7 that cannot be double used as Timers for other modes in the same program.
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The current value of Timer can not be kept on a loss of power to smart.
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