PLC programming is performed by which device or tool?

• A. A handheld programmer
• B. A PC connected over network
• C. A human-machine interface
• D. A touchscreen panel

Answer: (A)

Programming a PLC requires an interface that can create and transfer the control logic into the PLC. A handheld programmer is designed for this role: it is a dedicated, portable device that runs the PLC programming software and connects directly to the PLC to write, load, and debug the program in the field. Its portability and ruggedness make it especially suitable for commissioning, field service, and on-site updates. While a PC running programming software connected over a network is also used in many environments, the device most directly performing the programming action in many practice scenarios is the handheld programmer. HMIs and touchscreen panels, on the other hand, are intended for operator interaction with the process rather than for writing PLC logic.