Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | 900R08R-0200 |
| Manufacturer | Honeywell |
| Product Type | 8-Slot I/O Rack with Redundant Power Assembly |
| Series / Platform | ControlEdge HC900 |
| Slot Capacity | 8 I/O module slots |
| Power Configuration | Dual redundant power supplies, automatic failover, hot-swappable |
| Compatible Power Modules | 900P02-0001 (28 W, 5 V DC / 24 V DC), 900P01-0001 (60 W, universal AC input) |
| Power Status Monitoring | 900PSM-0001 power status module (for redundant configurations) |
| Backplane Output | Regulated 5 V DC logic rail + 24 V DC field rail |
| Backplane Bus | Integrated power distribution and high-speed communications bus |
| Module Hot-Swap | Yes – IRUP (Insertion / Removal Under Power) |
| Compatible Modules | All HC900 I/O modules (analog, digital, universal, relay, pulse/frequency, communication) |
| Dimensions (H × W × D) | 137 × 530.9 × 151.7 mm (5.4 × 20.9 × 6.0 in) |
| Weight | 4.42 kg (9.75 lb) |
| Mounting | Standard 35 mm DIN rail or panel mounting |
| Operating Temperature | 0 °C to 60 °C (32 °F to 140 °F) |
| Storage Temperature | -40 °C to 70 °C |
| Humidity Range | 10–95% RH, non-condensing |
| Cooling | Passive (no fans required) |
| Channel Isolation | Channel-to-channel isolation to prevent ground loops and transients |
| Certifications | CE, UL, FM, CSA |
| Environmental Protection | Conformal coated to G3 harsh-environment standard |
Main Features and Advantages
The 900R08R-0200 is purpose-engineered to eliminate single points of failure in the I/O subsystem. Its design addresses two of the most persistent pain points in industrial automation: unexpected power loss and inflexible system expansion.
Redundant power architecture:
The defining advantage of the 900R08R-0200 is its dual-power backplane. With two power supplies installed, a failure of one supply becomes a logged alarm rather than a process event. The surviving supply takes over the full load instantaneously, the rack continues scanning, and control loops remain closed. Maintenance can then be scheduled for normal working hours instead of treated as an emergency response.
Hot-swappable modules and power supplies:
Both the redundant power supplies and the I/O modules in the 900R08R-0200 can be inserted or removed under power. This IRUP capability means that a faulty analog input card or a failed power supply can be replaced without halting the process, dramatically reducing unplanned downtime and the risks associated with emergency interventions.
Scalable, mixed-module expansion:
The eight slots accept any combination of HC900 I/O and communication modules, allowing engineers to tailor the rack to specific application needs. The 900R08R-0200 can be added to an existing HC900 system as a local or remote rack and mixed with 4-slot and 12-slot racks in the same system, making growth an incremental purchase rather than a re-architecture project.
Low-noise, isolated backplane:
The integrated backplane separates power distribution traces from sensitive data signal buses and provides channel-to-channel isolation across inserted I/O modules. This prevents ground loops and high-voltage transients from corrupting measurement channels, preserving signal integrity for 4–20 mA loops, HART telemetry, and millivolt sensor signals.
