Wiring pilot signals in series accomplishes which logic?

• A. AND
• B. OR
• C. NOT
• D. NAND

Answer: (A)

Wiring pilot signals in series creates an AND condition: the circuit completes only if all pilots are energized. Each pilot acts as a gate; for current to flow to the actuator, every pilot must be on. If any one pilot is off, the path opens and the output remains de-energized, so the actuator does not operate. This is why the series arrangement embodies AND logic—all inputs must be true for the output to be true. If you wired the pilots in parallel, any one energized pilot would let current flow, which is OR logic. Not is a different concept that inversion or a separate arrangement would provide, not simply series wiring.