GE Fanuc IC655CHS506 / IC655CHS508 Series Five Base Units
Six- and eight-I/O-slot Series Five base units with different widths but the same CPU/power-supply architecture.
Function, System Position and Selection Boundary
Both base units mount in a panel and accept a power supply plus either a CPU or local I/O interface in the defined positions. Series Five I/O modules then occupy the remaining configured slots.
IC655CHS506 is the 16-inch base with six I/O slots; IC655CHS508 is the 19-inch base with eight I/O slots. With modules installed, the manual allows a cabinet depth of 5.5 inches, subject to front connectors and cable clearance.
Technical Specifications
Shared architecture
Mechanical differences
Cabinet Fit and Addressing
The wider rack adds two I/O positions, but a correct migration also needs the same base-unit identity, cable path, ventilation and unique ID.
IC655CHS506
Use where six I/O positions and 16-inch width match.
IC655CHS508
Use where eight I/O positions and 19-inch width match.
Both
Allow wiring space and preserve the base-unit ID and I/O references.
Installation and Acceptance Sequence
- Measure cabinet width, depth, mounting holes and cable clearance.
- Record the rotary base-unit ID and every I/O reference assignment.
- Mount with the documented ventilation space and grounding.
- Reconnect expansion cables in sequence and verify that no ID is duplicated.
FAQ
What is common to IC655CHS506 / IC655CHS508?
Both are Series Five base units using the same defined power-supply and CPU/local-interface positions.
How do IC655CHS506 / IC655CHS508 differ in capacity?
IC655CHS506 provides six I/O slots; IC655CHS508 provides eight.
How wide are IC655CHS506 / IC655CHS508?
The manual gives 16 in (399 mm) for IC655CHS506 and 19 in (483 mm) for IC655CHS508.
What ID must a CPU base use with IC655CHS506 / IC655CHS508?
The base containing the CPU must use ID 0; expansion bases use other unique values from 1 to 7.
Why can cabinet depth exceed 5.5 inches for IC655CHS506 / IC655CHS508?
Front connectors and installed cable bends may require more space than the base-unit depth alone.
Legacy and Hard-to-Find Parts
Parts sourcing includes discontinued, obsolete and difficult-to-find automation components for installed systems that remain in service.
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