Power that is derived from a PLC's power supply and then used for inputs and outputs is ___.

Power that is derived from a PLC's power supply and then used for inputs and outputs is ___.

• A. Internally sourced power
• B. Externally sourced power
• C. Indirect power
• D. Direct power

Answer: (A)

Internally sourced power means the PLC provides its own operating voltage to power its CPU and I/O modules. The PLC’s dedicated power supply creates the voltage rails (for example 24 V DC) that the input modules use to sense signals from sensors and the output modules use to drive actuators. This keeps the I/O circuits powered from the same source as the PLC, ensuring consistent voltage levels and proper isolation from field devices. If the I/O were powered from an external source separate from the PLC, that would be externally sourced power, which is not the standard arrangement for a PLC’s I/O operation.

Internally sourced power means the PLC provides its own operating voltage to power its CPU and I/O modules. The PLC’s dedicated power supply creates the voltage rails (for example 24 V DC) that the input modules use to sense signals from sensors and the output modules use to drive actuators. This keeps the I/O circuits powered from the same source as the PLC, ensuring consistent voltage levels and proper isolation from field devices. If the I/O were powered from an external source separate from the PLC, that would be externally sourced power, which is not the standard arrangement for a PLC’s I/O operation.