Allen-Bradley 1790-15CMCBL CompactBlock I/O Expansion Cable

The 1790-15CMCBL is a specialized 15 cm expansion ribbon cable designed for Allen-Bradley 1790 CompactBlock I/O distributed automation systems. It provides internal system bus connectivity between a primary CompactBlock base unit and adjacent CompactBlock expansion modules. Supplied in a package of 5 pieces, this flexible ribbon cable enables compact side-by-side module interconnection inside panel enclosures without requiring external terminal wiring.

System Interconnection and Bus Communication

The 1790-15CMCBL carries high-speed system bus communication signals and internal logic power from the main CompactBlock I/O base block to expansion I/O blocks. Its 15 cm length provides sufficient slack for proper positioning and alignment of adjacent DIN rail mounted blocks while maintaining minimal signal latency and low noise susceptibility across the expansion bus.

Installation and Physical Specification

Featuring pre-molded multi-pin ribbon connectors at both ends, the cable plugs directly into the designated expansion ports on the side housing of CompactBlock I/O modules. Keyed connector housings prevent reversed insertion, ensuring correct pin alignment during installation or module maintenance. The ribbon cable construction accommodates clean wire routing in tight control cabinets.

Frequently Asked Questions

Q: What is the primary function of the 1790-15CMCBL expansion cable? A: It connects a primary 1790 CompactBlock I/O base module to an adjacent CompactBlock expansion I/O module to extend internal system bus communication and logic power.

Q: Can the 1790-15CMCBL cable be daisy-chained for longer distance runs? A: No, this cable is designed solely for direct point-to-point connections between adjacent CompactBlock I/O units within its 15 cm length specification.