Final answer:
When designing a PLC system, it is crucial to choose components with extra capacity for reliable performance and system handling. Extra capacity allows for managing load changes and safety effectively by considering control limits and lead/lag criteria.
Explanation:
When planning a Programmable Logic Controller (PLC) system, it is wise to pick components with extra capacity to ensure the system can handle unexpected variations or future expansions. This additional capacity helps in ensuring the system's reliability and performance.
For example, in a furnace control system, having extra capacity in temperature controllers and valves controlling air and fuel flow can help manage load changes and safety concerns effectively.
Considering control limits and lead/lag criteria while selecting components ensures a well-functioning and safe PLC system.
Learn more about PLC system components here:
https://brainly.com/question/38836547
