Racks, chassis, and termination units provide the mechanical, electrical, and signal-distribution structure for modular industrial control systems. Their architecture can combine module slots, backplane buses, power distribution, field terminals, grounding provisions, connectors, and mounting hardware. The category includes system racks, controller chassis, backplanes, terminal bases, module termination units, field termination assemblies, and related mounting components. Technical characteristics vary by platform and include slot count, bus architecture, supported module family, terminal configuration, current capacity, mounting format, connector type, and environmental design. Functionally, these products secure system modules, distribute power and backplane communication, and provide organized field wiring between I/O electronics and plant devices. Replacement selection should match the exact controller or I/O family, chassis size, terminal arrangement, bus type, and original manufacturer part number.
