Class context for the integrator
PLCs of this class are the rack-mounted logic cell that holds the scan cycle, the I/O map, and the fieldbus slice for a cell or a sub-panel, which means the panel-builder's first question is whether the cabinet footprint, the backplane draw, and the existing terminal layout will accept the 3ADT220099R0003 without re-cutting DIN rail or re-marking row labels. Provided that the surrounding rack, supply, and fieldbus terminations already match the ABB PLCs family in this cabinet, the unit drops into a slot of the right form factor with no re-engineering; the 0.41 kgs figure is a handling number, not a derating curve, and a single tech can set it without lifting gear.