The memory space of a PLC can be divided according to which two types?

• A. Program and I/O.
• B. Program and data.
• C. Data and stack.
• D. Code and comments.

Answer: (B)

The memory space in a PLC is organized into two main regions: program memory and data memory. Program memory stores the control program—the ladder logic or other language that defines the sequence of operations the PLC will perform. Data memory holds the values the program uses at run time, such as inputs, outputs, timers, counters, flags, and other variables that can change as the process runs. This separation makes it clear which part contains the instructions to execute and which part holds the dynamic data those instructions operate on.

Other pairings don’t fit as the primary memory division. I/O relates to the external hardware points the PLC interacts with, not where the program is stored. A stack is a CPU concept used for managing temporary data during function calls, not a general division of the PLC’s memory space. Code and comments aren’t separate memory regions used during execution; comments are non-executable notes for humans.