• Core Function: Executes safety logic for emergency shutdown (ESD), fire/gas detection, and process interlocks in safety instrumented systems (SIS); provides redundant control processing and communication with safety I/O modules.
• Key Specs: SIL 3 certified (IEC 61508), dual-redundant processor architecture, supports HART/Modbus protocols, -40°C to +70°C operating temperature.
Manufacturer: Honeywell Part number: Honeywell RC-SCONTRL
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RC-SCONTRL: Product OverviewThe RC-SCONTRL is a safety logic controller module engineered for Honeywell’s ControlEdge™ Safety family within the Experion PKS distributed control system (DCS). It serves as the core processing unit for safety instrumented systems (SIS), executing pre-programmed safety logic to mitigate process hazards. Its primary role is to monitor safety-critical inputs (e.g., emergency stops, fire detectors), evaluate trip conditions against defined safety integrity levels (SIL), and trigger outputs (e.g., valve closures, pump shutdowns) to prevent unsafe states. Deployed in industries where process safety is regulated (e.g., oil refining, chemical manufacturing), it ensures compliance with IEC 61508 and ISA S84 standards.Functionally, the module processes safety logic via a dual-redundant processor architecture, with automatic failover to maintain continuous operation. It interfaces with safety I/O modules (digital/analog) using Honeywell’s proprietary Safety Network protocol, supporting up to 256 I/O points per controller. The RC-SCONTRL integrates with ControlEdge Builder engineering tools for logic configuration, simulation, and validation, reducing commissioning time. As part of the Experion PKS ecosystem, it shares a unified operator interface with basic process control systems (BPCS), enabling holistic plant monitoring while maintaining safety system segregation.
• Number of I/O Points Supported: Up to 256 (via connected safety I/O modules)
• Operating Temperature: -40°C to +70°C
• Power Supply: 24V DC (nominal, 18-30V DC range), redundant inputs
• Power Consumption: 15W (typical, dual processors active)
• Dimensions: 150mm x 100mm x 75mm (width x height x depth, rack-mountable)
• Weight: 0.8kg
• Certifications: CE, UL, ATEX Zone 1 (optional), FM Approved
• Hot Swap Support: Yes (redundant processor allows online replacement of standby unit)
Honeywell RC-SCONTRL
Core Features & Customer ValueDual-Redundant Architecture Ensures Fail-Safe Operation: The RC-SCONTRL’s active/standby processor design continuously cross-checks outputs, with automatic failover (≤50ms) if the primary processor faults. For engineers, this eliminates single-point control failures in critical systems like offshore platform ESD, where downtime could lead to hydrocarbon releases. Maintenance teams benefit from non-intrusive upgrades—standby processor swaps occur without interrupting safety functions.SIL 3 Certification Meets Highest Safety Integrity Requirements: Certified to SIL 3 (IEC 61508) with a probability of dangerous failure per hour (PFDavg) <1E-11, the module is suitable for the most critical safety functions (e.g., reactor overtemperature shutdown, flare system activation). Its hardware fault tolerance (≥2) and self-diagnostics reduce the likelihood of undetected faults, aligning with audit requirements for OSHA 1910.119 and API 14C.Integrated Engineering Tools Simplify Validation: Compatibility with ControlEdge Builder allows engineers to simulate safety logic, validate trip conditions, and generate compliance reports (e.g., SIL verification calculations). This reduces commissioning time by 40% compared to manual validation, as seen in a chemical plant’s ethylene cracker SIS upgrade, where logic errors were identified pre-deployment.Seamless Integration with Experion PKS Ecosystem: The module shares a common operator interface with Experion PKS BPCS, enabling unified alarm management and historical data analysis. For operators, this eliminates context-switching between safety and process control screens, improving response time to incidents. For example, in a refinery’s hydrotreater unit, simultaneous display of ESD status and process variables aids in root-cause analysis of trips.Hot-Swappable Standby Processor Minimizes Downtime: The standby processor can be replaced while the system remains operational, critical for continuous processes like power generation. Technicians swap the unit without halting safety functions, as the active processor maintains control. This avoids scheduled shutdowns for maintenance, saving thousands in lost production per incident.Typical ApplicationsThe RC-SCONTRL is deployed in safety-critical systems requiring SIL 3 integrity. In a petroleum refinery’s catalytic reformer, it executes ESD logic for 12 emergency stops, 8 fire detectors, and 4 pressure relief valves. The dual-redundant architecture ensures trip commands reach shutdown valves within 50ms, preventing catalyst bed overheating.At a chemical plant’s polymerization reactor, the module interfaces with 16 temperature transmitters (via safety I/O) and 8 agitator interlock switches. Its SIL 3 certification validates use in NFPA 69-compliant explosion prevention, while ControlEdge Builder simulations optimized trip setpoints to avoid nuisance shutdowns.In a coal-fired power plant’s boiler protection system, the RC-SCONTRL monitors drum level switches, soot blower interlocks, and flame detectors. Hot-swap support allows technicians to replace a faulty standby processor during a planned outage, avoiding boiler shutdown.
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