Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 900RR0-0101 |
| Manufacturer | Honeywell |
| Product Type | Redundant CPU Rack Assembly (Redundant CPM / Controller Rack) |
| Platform | Honeywell ControlEdge HC900 Process and Safety Controller |
| Primary Function | Houses dual redundant CPU modules and the redundancy switch module; no local I/O |
| Redundancy Support | Two controller slots for active (Lead) and standby (Reserve) operation with synchronisation |
| Slot Provision | Dual CPU slots plus redundancy switch module position between the CPUs |
| Power Configuration | Two independent power supply feeds, one per CPU; dual redundant inputs supported |
| Supply Voltage | 24 V DC (distributed from HC900 power supply modules), max. 130 W |
| Backplane Function | High-speed redundant communication and synchronisation bus plus power distribution |
| Construction | Industrial-grade chassis with reinforced backplane connectors |
| Cooling | Passive convection, fanless design |
| Mounting | Wall or panel mounting with four rear screws; rear mounting plate adds to overall height |
| Dimensions (H × W × D) | 137 mm × 261.6 mm × 151.7 mm (5.4 × 10.3 × 6.0 in) |
| Weight | approx. 1.75 kg (3.9 lb) |
| Operating Temperature | 0 °C to +55 °C |
| Storage Temperature | −20 °C to +70 °C |
| Humidity | 5 % to 95 % RH, non-condensing |
| Vibration | 5 Hz to 15.77 Hz at 2.03 mm peak-to-peak; 15.77 Hz to 250 Hz at 1.0 g |
| Installation Standards | Complies with IEC 60664 and UL 840 |
| Protection Rating | IP20, for installation inside an industrial control enclosure |
| Country of Origin | USA |
Main Features and Advantages
Purpose-built for true controller redundancy: The Honeywell 900RR0-0101 separates the processors from everything else. By giving the two CPUs their own rack with no I/O slots, it removes the shared failure modes that appear when redundant controllers are squeezed into a general-purpose rack. Each controller gets its own backplane power path, its own synchronisation channel and its own Ethernet path to the I/O racks, so a fault that disables one side does not propagate to the other.Bumpless switchover support: The backplane of the Honeywell 900RR0-0101 carries the high-speed synchronisation link that keeps the standby controller continuously updated with the state of the lead controller. When a switchover occurs — whether triggered by a hardware fault, a firmware watchdog or a planned maintenance action — the reserve controller already holds the current process image, so control outputs do not bump and the operator sees no disturbance in the loops.Dual power paths: Redundancy that ignores the power supply is only half a design. The Honeywell 900RR0-0101 distributes power to the two CPU sections over independent traces, allowing two supply modules to feed the rack from separate sources. A single supply failure therefore leaves one controller powered rather than dropping the whole redundant pair, which is the practical difference between a degraded system and a shutdown.Mechanical integrity for harsh cabinets: Weighing about 1.75 kg in a reinforced chassis, the Honeywell 900RR0-0101 resists the vibration and mechanical resonance that cause micro-fretting on backplane connector pins over years of service. The fanless, passively cooled design eliminates the moving part most likely to fail first in a control cabinet, and the wall-mount form factor keeps the redundant pair accessible without consuming rack width.Standards compliance and simple integration: Built to IEC 60664 and UL 840 installation requirements and compatible with the standard HC900 module footprint and wiring layout, the Honeywell 900RR0-0101 integrates into existing HC900 cabinets without custom engineering, and it can be commissioned with a single controller installed and upgraded to full redundancy later simply by adding the second CPU and switch module.
