Configured for redundant CPM mounting in HC900 controller networks, the Honeywell 900RR0-0200 (900RR0-0200 rack assembly) provides direct mechanical and backplane engagement for dual‑processor execution.
Hardware Specifications
Parameter
Specification
Model
900RR0-0200
Brand
Honeywell
Origin
Not specified
Weight
1751 g
Dimensions
137 mm H x 261.6 mm W x 151.7 mm D
Operating Temp
Not specified
Power Consumption
Not specified
Core Performance Indicators
Redundant CPM rack assembly for HC900 backplane connectivity
4-20 mA HART Loop Protocol Behavior
Although the 900RR0-0200 is a mechanical rack assembly, its backplane routing supports stable operation of CPM modules handling 4-20 mA HART loop channels. The rack’s connector geometry maintains channel-to-channel isolation, preventing impedance drift that could distort analog loop readings. HART burst packets are passed through the CPM module’s interface without cross-talk, and cold junction compensation (CJC) routines—when present in associated analog modules—are processed without interference from adjacent slots.
Frequently Asked Questions
Q: Can CPM modules be hot-swapped while installed in the 900RR0-0200 rack? A: CPM modules may be removed with power applied, but the rack itself does not add hot-swap circuitry. System impact depends on the redundancy configuration.
Q: Does the rack contribute active current load to the HC900 power system? A: The rack does not draw active current. It distributes regulated DC supplied by the HC900 power module, with total load determined by installed CPM and I/O modules.
Q: How does redundancy switchover occur when using this rack? A: Switchover timing is governed by CPM firmware. The rack provides the physical dual-slot arrangement and backplane signal paths required for redundant operation.
Field Installation Guidelines
Mount the rack on a rigid panel surface to prevent vibration-induced connector wear.
Ensure proper grounding by bonding the rack frame to the cabinet grounding bar.
Maintain separation between analog and digital wiring to reduce noise coupling into CPM channels.
Verify full seating of backplane connectors before applying power to avoid intermittent CPM communication.
Allow clearance for module removal and avoid cable strain that may obstruct CPM extraction.
