What is the expected voltage range for standard industrial control systems?

The expected voltage range for standard industrial control systems typically includes low voltages to ensure safety and compatibility with various control components and sensors. The most common standard in industrial applications for control circuits is 24V DC, which is widely used for sensors, relays, and low-voltage control devices. This voltage level minimizes the risk of electric shock while providing adequate power for operation.

In addition to the low DC voltage, industrial control systems often utilize 120V AC for the power supply of larger equipment and control circuits. This voltage is also standard in many industrial settings, making it a practical choice for interfacing with various machinery and equipment.

The inclusion of both 24V DC and 120V AC in the correct answer reflects the common practices in the industry, ensuring compatibility and safety without compromising functionality. Other options may present voltage ranges that could either be too high or are less commonly used in typical industrial control settings, making them less relevant to the standard practices within the industry.