Question

For a TOF timer:

When is the enable bit of a timer instruction true?

Answer 1

The enable bit of a timer instruction becomes true when the rung preceding the timer is true.

Step-by-step explanation:

In a TOF (Timer On Delay) instruction, the enable bit becomes true when the rung preceding the timer becomes true. The rung refers to the set of conditions or events that need to be satisfied for the timer to start counting. Once the rung is true, the enable bit of the timer instruction is set to true and the timer begins counting. This enables the timer to measure the duration of a certain event or condition.