Description
The Honeywell 900R12R-0200 is a 12-slot redundant I/O expansion rack baseplate designed for the ControlEdge HC900 and legacy Hybrid Control Designer automation platforms. It functions as a remote or local I/O terminal foundation, providing physical slots and internal dual-bus backplane routing to house up to 12 process I/O modules alongside redundant remote I/O scanner modules or redundant power supplies.
Commercial Supply Status
- Condition: New Original (New Surplus), Factory Sealed
- Availability: In stock
- Lead Time: 1–3 business days
- Warranty: 12 months
- Pricing Note: Price subject to market conditions; contact us for a firm quote.
Field Engineering & Integration Notes
In high-availability plant topologies, the 900R12R-0200 is deployed when I/O drop survivability is mandatory. The “R” designation in the model number denotes the redundant backplane architecture, which features separate internal trace routes for dual Ethernet communication loops and dual power rails.
During a 2 AM troubleshooting cycle involving an I/O rack communication breakdown, verify the integrity of the dual 900C50 or 900C53 remote I/O scanner modules installed on the rack’s left-hand controller interfaces. The rack isolates communication line A from line B; if the primary scanner fails, the backplane logic automatically switches control to the secondary scanner without dropping active outputs. When replacing or adding discrete or analog modules, ensure the grounding bar along the base of the rack is bonded directly to the enclosure ground plane, as floating grounds can induce common-mode noise across the high-density 12-slot internal analog bus.
Technical Specifications
| Parameter | Value |
| Product Platform | ControlEdge HC900 / Hybrid Controller System |
| Rack Configuration | 12-Slot Redundant I/O Expansion Chassis |
| Model Number | 900R12R-0200 |
| Module Slot Capacity | 12 x Process I/O slots, 2 x Scanner slots, 2 x Power Supply slots |
| Chassis Width | 535.9 mm (21.1 inches) |
| Chassis Height | 137.0 mm (5.4 inches) |
| Chassis Depth | 151.7 mm (6.0 inches) |
| Net Hardware Weight | Approximately 3,200 g (7.05 lbs) without modules |
| Mounting Profile | Backpanel surface mount or direct DIN-rail installation |
| Environmental Approvals | CE, UL 61010-1, FM Class I Div 2, ATEX Zone 2 |
| Operating Temperature | 0 to +60 °C (+32 to +140 °F) |
| Storage Temperature | −40 to +85 °C (−40 to +185 °F) |
Internal Backplane Topology
The dual-bus circuitry of the 900R12R-0200 routes specific internal channels:
- Redundant Power Sharing: The two power slots operate in a parallel load-sharing configuration. If one supply drops due to a tripped circuit breaker, the secondary unit instantly takes on the full 12-slot load.
- Redundant I/O Bus: Features dual independent serial communication networks printed onto the multi-layer backplane board, preventing a single point of failure within the internal rack bus lines from disabling all 12 modules.
Frequently Asked Questions
- Q: Can I run this redundant rack with only a single power supply installed?
- A: Yes. The rack will boot and fully execute I/O processes with a single power module. However, the system software will flag a continuous diagnostic system alarm indicating a missing power source, and your configuration will no longer possess power redundancy.
- Q: What is the primary difference between the 900R12R-0200 and the standard 900R12-0200?
- A: The standard
900R12-0200features a non-redundant backplane, accepting only one power supply module and one scanner interface card. The900R12R-0200includes the specialized internal dual-trace architecture and mechanical slots required for full communication and power redundancy.
- A: The standard
- Q: Can I hot-swap I/O modules on this backplane while the system is under power?
- A: Yes. The HC900 platform supports Hot-Swapping (Removal and Insertion Under Power) of individual I/O modules. When replacing a card, ensure the mechanical module type keys on the rack slide correspond perfectly to the card being inserted to prevent field wiring voltage back-feeding. Verify specific alignment limits on the OEM datasheet.
Honeywell 05701-A-0302 Single-Channel Control Card Honeywell 05704-A-0144 System 57 Quad Control Card Honeywell FC-QPP-0002 – Quad Processor Pack Honeywell CC-PWRR01 – Redundant Power Supply Module
- A: Yes. The HC900 platform supports Hot-Swapping (Removal and Insertion Under Power) of individual I/O modules. When replacing a card, ensure the mechanical module type keys on the rack slide correspond perfectly to the card being inserted to prevent field wiring voltage back-feeding. Verify specific alignment limits on the OEM datasheet.
