In which mode do most programming changes occur without interrupting the process?

Most programming changes in a ControlLogix system typically occur in Remote Run Mode. This mode allows maintenance staff or programmers to make changes to the program while the process is still running, thereby preventing any interruptions. It is particularly useful for making adjustments or updates to application logic without taking down the production line or affecting ongoing operations.

Using Remote Run Mode, users can connect remotely to the control system, allowing for changes to be made seamlessly. This capability is essential for systems that require high availability and minimal downtime since it ensures that changes can be tested and implemented in a live environment without disrupting the process.

Program Mode and Run Mode do not provide the same advantages. In Program Mode, changes are made when the processor is not actively executing the control logic, which could lead to unplanned system downtime. Run Mode allows the processor to execute logic but does not permit making changes to the program. Remote Test Mode, while it allows certain tests, does not generally accommodate the full range of programming changes that can occur in Remote Run Mode.