Why can digital computers be easier to reprogram than conventional industrial control equipment?

Digital computers are easier to reprogram than conventional industrial control equipment because they allow for functional changes through software updates rather than physical modifications.1

In conventional control systems, which typically consist of single-loop analogue devices, implementing new functions or revising existing ones requires replacing the actual physical hardware apparatus. In contrast, a digital computer can be programmed to perform a wide variety of tasks, and its instructions can be easily modified to accommodate process changes or system revisions without altering the physical equipment.1

This flexibility is a significant advantage in industrial automation, as it allows for rapid adaptation to new requirements, such as handling smaller production runs or compensating for variations in manufacturing processes, without the need for costly and time-consuming hardware replacements. While some internal components like hardwired control units are impossible to modify without physical alteration, the general programmability of digital systems provides a versatile and efficient alternative for modern industrial control.12