Chapter 4: RLL Programming
Timer Mode 7 (FLASH Cascade without Reset)
Mode 7 Timer is a Flash timer without reset that uses two timers in a cascade configuration. 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 current time value is non-retentive and will reset to zero on a loss of power to the PLR.
In the example below, timer status bit T1 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 T2 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.
Note: Timer Mode 7 uses two timers. These timers cannot be reused as timers for other modes in other areas of the
program.
48
SG2 PLR User Manual
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