Modular PLCs are built by selecting components that fulfill the requirements for the control application and installing them into the rack or chassis. This statement is which of the following?

• A. True
• B. False
• C. Not always
• D. Sometimes

Answer: (A)

Modular PLCs are designed to be built to fit the specific control task by choosing the right modules and putting them into a rack or chassis. You pick the CPU, power supply, I/O, and any needed communication or specialty modules, and then mount them in the backplane of a standard rack. The backplane provides the electrical connections and data paths so every module can work together with the CPU. This configurability is what makes modular PLCs adaptable to different applications and scalable as requirements grow or change. That’s why this statement is true: the intended method is exactly how modular PLCs are configured.