What is the truth value of the statement: "A ladder diagram has only outputs on each rung"?

The statement that "A ladder diagram has only outputs on each rung" is false because ladder diagrams in the context of motor control and automation can have both inputs and outputs represented on each rung.

In a typical ladder diagram, the structure mirrors electrical relay circuits, where each rung often contains a combination of input devices (such as switches and sensors) and output devices (like motors or lights). The inputs are usually positioned on the left side of the rung while the outputs are on the right, but rungs can represent various types of logical functions including those that involve multiple inputs and outputs.

Furthermore, because the ladder logic is designed to relay control logic for machinery and electrical systems, inputs can be part of the same rung where outputs are used to activate or control them. This design allows for complex control scenarios where the state of outputs depends on the condition of multiple inputs.

The incorrect alternatives may imply limitations or variations that do not accurately denote the versatility and wide application of ladder diagrams in automation. While there can be specific adaptations based on the application or manufacturer, the core understanding remains that ladder diagrams can and do contain inputs alongside outputs, thereby making the original statement false.