Product Name:Redundant Switch Module
Brand Name: HONEYWELL
Model Number:900RSM-0101
Country of Origin:USA
Warranty: 12 Months
Whatsapp：+86 18159889985
Email：[email protected]
Brand Name: |
HONEYWELL |
Model Number: |
900RSM-0101 |
Country of Origin: |
USA |
Packaging Details: |
Original new Factory Sealed |
Delivery Time: |
Delivery time in stock |
Payment Terms: |
T/T |
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Sales Manager: |
Stella |
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Send an email: |
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The HONEYWELL 900RSM-0101 is a dedicated Redundant Switch Module engineered for the ControlEdge HC900 redundant controller rack. Positioned physically between two C75/C75S CPUs, the 900RSM-0101 manages automatic failover and mode synchronization between the Lead and Reserve processors. This HONEYWELL module provides green LED indicators for at‑a‑glance status monitoring and features a keyed switch to manually initiate switchovers when needed. Supporting hot‑swappable RIUP replacement, the 900RSM-0101 ensures continuous process control without requiring system downtime. It is a mandatory hardware component for any HC900 safety or high‑availability configuration and draws only 22 mA from the 5V backplane supply.
Oil & Gas Refining: Maintains continuous process control during CPU maintenance or unplanned failures
Power Generation: Provides bumpless transfer between redundant controllers in boiler and turbine control systems
Chemical Processing: Guarantees uninterrupted safety instrumented functions (SIF) in SIL‑rated environments
Water/Wastewater Treatment: Enables high‑availability control for critical pumping and filtration operations
Pharmaceutical Manufacturing: Prevents production stoppages during controller firmware upgrades or hardware replacement
Pipeline Monitoring: Sustains 24/7 supervisory control and data acquisition (SCADA) across remote assets
Metal & Mining: Delivers fault‑tolerant logic for material handling and processing equipment
Automatic Failover Management: Continuously monitors Lead CPU heartbeat and seamlessly transfers control to Reserve CPU upon fault detection
Manual Switchover Capability: Keyed switch with a momentary contact position allows operators to force control transfer from CPU‑A to CPU‑B or vice‑versa for planned maintenance
Clear Visual Status Indication: Green arrow LEDs instantly identify the active Lead controller and which CPU is standing by as Reserve
Hot‑Swappable (RIUP) Design: The module may be removed or inserted while the rack is powered without inducing a controller failover
Synchronized Mode Control: Both Lead and Reserve CPUs maintain identical operating modes as dictated by the RSM key switch position
Critical Redundancy Enabler: Mandatory component for building a SIL‑capable redundant controller rack with C75 processors
Low Power Consumption: Draws only 22 mA from the 5V backplane supply, minimizing overall rack power loading
Industrial Temperature Rating: Rugged design ensures stable operation across 0°C to 60°C ambient conditions
Failover Arbitration: Determines when to switch control from Lead to Reserve based on internal health checks (watchdog timeouts, communication loss, processor exceptions). If the Lead CPU fails, the RSM directs the Reserve to immediately take over I/O and network control
Mode Synchronization: Propagates the selected operating mode (Run‑Locked, Run/Program, Program‑Locked) from the Lead CPU to the Reserve through the RSM, ensuring both processors operate in lockstep
Manual Transfer Coordination: Interprets momentary key‑turn actions and executes a controlled, bumpless switchover from Lead to Reserve without disrupting I/O or host communications
Lead/Reserve Status Indication: Drives green arrow LEDs on the front panel to show which CPU is currently in control (Lead) and which is the hot‑standby (Reserve)
Startup Leader Assignment: At system power‑up, the first available C75 assumes Lead status; in a tie condition, the RSM designates the left CPU (CPU‑A) as Lead. No user configuration is required to establish initial priority
System Integrity Assurance: Prevents "split‑brain" scenarios by ensuring only the Lead CPU communicates with I/O racks and external hosts. The RSM acts as the sole arbitration point for control authority
Q1: Is the 900RSM-0101 compatible with all HC900 controller models?
A: No. The HONEYWELL 900RSM-0101 is specifically designed for the ControlEdge HC900 platform when configured with dual C75 or C75S CPUs. It is NOT supported in non‑redundant applications or with C30/C30S, C50/C50S, or C70/C70S standalone controllers. For legacy redundant C70R systems, the RSM is still required. Always verify controller model numbers match the system revision (e.g., 900C75S‑0360‑00 paired with this RSM).
Q2: Can the 900RSM-0101 be replaced while the controller rack is powered on?
A: Yes. The 900RSM-0101 supports Removal and Insertion Under Power (RIUP). However, before doing so, site personnel must bring the process to a safe state or transfer critical loops to manual control. The C70R CPU modules remain in their last used mode while the RSM is removed, and replacement does not induce a controller failover. Always disconnect field power from terminal blocks before servicing.
Q3: How do I manually force a failover using the key switch?
A: The lead‑designated CPU will actively control the process. To perform a manual failover, turn the key switch on the 900RSM-0101 to the momentary "Failover" position and hold it there until both Reserve lights illuminate, then release the key. This transfers control to the Reserve CPU without affecting the controller operating mode.
Q4: What do the green arrow LEDs on the 900RSM-0101 indicate?
A: The green arrow LEDs identify the current Lead and Reserve CPUs. One arrow pointing to the left CPU indicates that CPU‑A is the Lead. One arrow pointing to the right CPU indicates that CPU‑B is the Lead. If neither arrow is lit, the redundancy link is not established or a diagnostic condition exists. Check the controller status LEDs or use HC Designer to view detailed system diagnostics.
Q5: Does the 900RSM-0101 consume a slot in the controller rack?
A: Yes. The HONEYWELL 900RSM-0101 is a dedicated hardware module that occupies the middle slot of the redundant controller rack, positioned physically between the two C75/C75S CPUs. It does not consume an I/O slot; rather, it sits in a dedicated position within the controller rack alongside the two power supplies and the two CPUs. The rack will be pre‑configured with a slot specifically for the RSM.
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