To display the next higher number on the LED display, what must be changed?

To display the next higher number on the LED display, the essential action is to change only the relevant output, specifically setting the output signal QX.0 to 1. In many control systems utilizing programmable logic controllers (PLCs), the output signals directly control the state of devices such as indicators or displays. If the display is intended to show a higher number, changing the output to correspond to the desired numeral on the LED display is necessary.

The reason this option is effective is that in a binary or digital system, simply toggling the appropriate output signal can effectively increment the displayed number. The output QX.0 in this context likely signifies a specific bit that represents part of the total number displayed on the LED. Hence, by altering this single output, you can control the display without needing to engage in broader system modifications.

Different choices represent actions that either won't directly produce the intended outcome or pertain to processes that are not necessary for simply incrementing the displayed number. For instance, adjusting PLC input values or recalibrating sensor readings does not directly influence the output displayed; they're more aligned with data input and accuracy but not with manipulating the visual output on the display. Similarly, resetting all output signals would revert the entire output state, likely