Which timer would you use to turn on a "product jammed" alarm if a part is in front of a photoeye for more than 1 second?

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The timer that is appropriate for turning on a "product jammed" alarm when a part blocks a photoeye for more than 1 second is the TON, or Timer On Delay. This type of timer starts counting when the input condition is true—in this case, when the photoeye detects the presence of a part in front of it. If the presence of the part continues for the specified duration, which is 1 second in this scenario, the timer will reach its preset value, and the output will indicate that the alarm should be activated.

Using a TON timer ensures that the alarm is only triggered if the condition persists over the required time interval, effectively filtering out any brief interruptions that do not represent a true product jam. This approach prevents nuisance alarms and allows for accurate monitoring of the system's operational status.

The other timer options are designed for different applications; for instance, a TOF (Timer Off Delay) would be used to delay the turning off of an output after the input condition goes false rather than for a timing delay before an output activates. An RTO (Retentive On Delay) retains the accumulated time even if the input goes false, which is not suitable for this specific use case. Lastly, the CTU (Count

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