As shown in figure "A" of the illustrated block diagram of a central operating system configured for direct digital control, what does the output system block "ANALOG D/A" represent? EL-0095

Correct Answer: Option C — It receives digital outputs from the CPU and converts these to analog signals for transmission to the analog actuators.

Digital-to-Analog (D/A) converters translate the discrete binary output from the CPU into a continuous analog signal. This signal is required to drive analog actuators, such as pneumatic positioners or variable speed drives, which rely on proportional voltage or current levels to modulate machinery performance accurately.