Questions: The main advantage of fixed I / O is;
Lower cost
Increased flexibility
Greater selection of modules
Faster replacement of I/O modules
Transcript text: The main advantage of fixed $\mathrm{I} / \mathrm{O}$ is;
Lower cost
Increased flexibility
Greater selection of modules
Faster replacement of I/O modules
Solution
The answer is the fourth one: Faster replacement of I/O modules.
Explanation for each option:
Lower cost: Fixed I/O systems are generally less expensive than modular systems because they are simpler and have fewer components. However, this is not the main advantage highlighted in the context of fixed I/O systems.
Increased flexibility: Fixed I/O systems are typically less flexible than modular systems because they have a predetermined set of inputs and outputs that cannot be easily changed or expanded. Therefore, increased flexibility is not an advantage of fixed I/O.
Greater selection of modules: Fixed I/O systems do not offer a greater selection of modules compared to modular systems. Modular systems are designed to allow users to select and configure different modules according to their needs, which is not the case with fixed I/O.
Faster replacement of I/O modules: Fixed I/O systems can offer faster replacement of I/O modules because they are designed as a single unit, which can be swapped out quickly if needed. This is a key advantage in situations where downtime needs to be minimized.
In summary, the main advantage of fixed I/O is the faster replacement of I/O modules.