Honeywell 900RSM-0001 Redundant CPU Switch Module (RSM)

Product Overview

The Honeywell 900RSM-0001 is a Redundant CPU Switch Module (RSM) designed for the ControlEdge HC900 redundant controller rack. It provides automatic failover, synchronization, and manual override capabilities between the primary and backup CPUs, ensuring continuous control in mission-critical industrial automation environments. As an earlier-generation redundancy manager, the 900RSM-0001 maintains compatibility with legacy HC900 redundant systems while delivering the high-availability performance required for process and safety applications.

Key Features

• Automatic failover to backup CPU upon primary CPU failure
• CPU synchronization keeps both controllers aligned and ready for switchover
• Manual override enables maintenance or test-driven CPU switching
• Visual status indicators display primary and backup CPU states
• Seamless integration into ControlEdge HC900 redundant controller racks
• Designed for high-availability process control architectures
• One RSM required per redundant controller rack

Technical Specifications

• Model: 900RSM-0001
• Product Type: Redundant CPU Switch Module (RSM)
• Series: ControlEdge HC900
• Function: Automatic failover, CPU synchronization, manual switchover
• System Compatibility: ControlEdge HC900 Redundant Controller Rack
• Failover Mode: Automatic transfer to backup CPU on primary fault
• Manual Control: Manual override for maintenance and testing
• Status Indication: Visual indicators for primary and backup CPU status
• Operating Temperature: 0°C to +60°C
• Storage Temperature: −25°C to +70°C
• Humidity: 5% to 95% RH (non-condensing)
• Weight: Approx. 1.2 kg
• Mounting: HC900 redundant controller rack slot
• Certifications: CE, TÜV, UL508, CSA

Typical Applications

• Legacy HC900 redundant controller systems
• High-availability process automation
• Safety instrumented systems requiring CPU redundancy
• Chemical and petrochemical plant control
• Power generation and distribution control

FAQ

Installation Guide

1. Power Down: De-energize the redundant controller rack before installing or replacing the 900RSM-0001.
2. Slot Placement: Insert the module into the designated RSM slot in the redundant controller rack, typically located between the two CPU modules.
3. CPU Connection: Ensure both primary and backup CPUs are properly seated and connected to the RSM via the rack backplane.
4. Status Check: Power on the rack and observe the status indicators to confirm both CPUs are recognized and synchronized.
5. Failover Test: Perform a controlled failover test during commissioning to verify automatic and manual switchover functions.
6. Documentation: Record the primary/backup CPU assignments and RSM configuration in the system maintenance log.

Selection Tips

• Select the 900RSM-0001 for legacy HC900 redundant systems that specifically require this part number.
• For new installations, prefer the 900RSM-0101 for enhanced hot-swap and diagnostic capabilities.
• Always verify controller rack part number (e.g., 900RR0-0101 vs. 900RR0-0300) to ensure RSM compatibility.
• Confirm CPU model and firmware revision support the RSM before ordering.
• Maintain a spare RSM on-site for critical redundant systems to minimize downtime.