Which term describes an input or output on a PLC card that requires more than one connection point?

• A. Input or output on a PLC card that requires more than one connection point
• B. A base 2 numbering system
• C. A communication channel between PLCs
• D. A high speed data transmission medium

Answer: (A)

Multi-point I/O describes an input or output on a PLC card that uses more than one connection point. In practice, a single I/O channel is spread across several terminals so multiple devices can be wired to that same channel. This lets you connect multiple sensors to one input or drive several actuators from one output while keeping the wiring compact. When using multi-point I/O, you must stay within the channel’s electrical ratings (current/voltage) and wire correctly so each device terms the signal as intended and doesn’t affect the others. The other concepts referenced—binary numbering, a PLC-to-PLC communication channel, or a high-speed data medium—relate to different ideas and don’t describe how an I/O point is physically shared across multiple connections.