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Totaliser, Timer. Clock, Counter Operation 2704 Controller 12.2.3. One Shot Timer Mode This timer behaves like a simple oven timer. • When the Time is edited to a non-zero value the Output is set to On • The Time value is decremented until it reaches zero. The Output is then cleared to Off • The Time value can be edited at any point to increase or decrease the duration of the On time • Once set to zero, the Time is not reset to a previous value, it must be edited by the operator to start the next On-Time • The Input is used to gate the Output. If the Input is set, the time will count down to zero. If the Input is cleared to Off, then the Time will hold and the Output will switch Off until the Input is next set. Note: since the Input is a digital wire, it is possible for the operator to NOT wire it, and set the Input value to On which permanently enables the timer. • The Triggered variable will be set to On as soon as the Time is edited. It will reset when the Output is cleared to Off. Figure 12.3 illustrates the behaviour of the timer under different input conditions. Input Time Edited Time Edited Output Time Time Time Elapsed Time Triggered This diagram shows how the Input can be used to gate the Timer as a type of hold Input Output Time Edited A B C D A+B+C+D = Figure 12-3: One Shot Timer 12-6 Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00
2704 Controller Totaliser, Timer. Clock, Counter Operation 12.2.4. Minimum On Timer Mode This timer has been targeted at guaranteeing that the output remains On for a duration after the input signal has been removed. It may be used, for example, to ensure that a compressor is not cycled excessively. • The output will be set to On when the Input changes from Off to On. • When the Input changes from On to Off, the elapsed time will start incrementing towards the set Time. • The Output will remain On until the elapsed time has reached the set Time. The Output will then switch Off. • If the Input signal returns to On while the Output is On, the elapsed time will reset to 0, ready to begin incrementing when the Input switches Off. • The Triggered variable will be set while the elapsed time is >0. It will indicate that the timer is counting. Figure 12.4 illustrates the behaviour of the timer under different input conditions. Input Output Elapsed Time Triggered Time Time Figure 12-4: Minimum On Timer Under Different Input Conditions Installation and Operation Handbook. Part No HA026502 Issue 1.0 Apr-00 12-7
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2704 Controller Contents MODEL 2704
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2704 Controller Introduction ➃
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2704 Controller Appendix A A. APPEN
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2704 Controller Appendix A B. QUICK
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