Bailey 820 Line of controllers, 6629543A1 Sequence.
- Application: The Bailey 820 Control System was introduced in the early 1970s with a "split" architecture. It was primarily designed for power station utility automation, serving as the modulating control for boilers (such as Babcock & Wilcox Integrated Control Systems).
- Module Function: While standard 820 modules handle modulating analog functions (such as summers, multipliers, and limiters), the 6629543A1 Sequence Module is used for step-based control logic, sequence timing, or logic operations within the system loop