The state of a ladder rung determines whether a discrete handshake bit is turned on or off.

• A. True
• B. False
• C. Not applicable
• D. Sometimes

Answer: (A)

In ladder logic, a rung is a conditional path where the left-side inputs determine whether current can reach the right-side output. A discrete handshake bit is typically modeled as a coil or internal bit on the right side of a rung. When the rung’s input conditions evaluate to true, the coil is energized and the handshake bit turns on; if any required condition is not met, the coil is not energized and the bit is off. The exact behavior depends on whether contacts are normally open or normally closed, but the essential idea is that the rung’s evaluated state directly sets the handshake bit.