The output interface module connects to

• A. Input Sensors
• B. Load Devices Such as Lamps or Solenoids
• C. Communication Protocols
• D. Memory Chips

Answer: (B)

An output interface module is used to drive external devices that perform work, turning the PLC’s control signals into real action. It provides the voltage/current and switching capability needed to energize actuators.

That’s why it connects to load devices like lamps or solenoids—these are actuators that consume electrical energy to produce heat, motion, or illumination, and they require a controlled output from the PLC.

Input sensors, by contrast, feed signals into the PLC via input interfaces, not outputs. Communication protocols are handled by dedicated network or communication modules, and memory chips belong to the PLC’s internal memory system, not the output interface.