What hosts the PLC logic, memory and communications?

What hosts the PLC logic, memory and communications?

• A. Input/Output Module
• B. Power Supply
• C. Central Processing Unit
• D. Network Interface Card

Answer: (C)

In a PLC, the central processing unit is where the PLC logic runs, where program and data are stored in memory, and where communications with I/O and networks are managed. The CPU executes the control program (the ladder or other code), uses its memory to hold the program and data, and handles the exchange of information with both local I/O modules and remote devices. The input/output module is responsible for interfacing with field signals, but it doesn’t run the control program. The power supply just provides the necessary power. The network interface card enables connectivity, but it isn’t the entity that hosts and executes the PLC logic or holds the main memory.

In a PLC, the central processing unit is where the PLC logic runs, where program and data are stored in memory, and where communications with I/O and networks are managed. The CPU executes the control program (the ladder or other code), uses its memory to hold the program and data, and handles the exchange of information with both local I/O modules and remote devices. The input/output module is responsible for interfacing with field signals, but it doesn’t run the control program. The power supply just provides the necessary power. The network interface card enables connectivity, but it isn’t the entity that hosts and executes the PLC logic or holds the main memory.