Description
Product Overview
The CCC TIOC-555HD is a highly specialized, ruggedized Triple Modular Redundant (TMR) Input/Output Controller designed for mission-critical and safety-instrumented applications, likely within the aerospace, defense, or nuclear industries. The «CCC» manufacturer is almost certainly Curtiss-Wright Controls, a leader in high-reliability embedded computing. The designation «TIOC» stands for Triple I/O Controller, and «555HD» indicates a specific high-density or high-performance variant within the product family. This unit is a sophisticated electronic assembly that provides a fault-tolerant interface between a TMR (Triple Modular Redundant) safety controller or flight computer and the physical sensors and actuators in the field. Its core function is to acquire analog and digital input data from critical field devices through three independent, parallel signal paths, perform 2-out-of-3 (2oo3) voting on the inputs, and output voted control commands to actuators, ensuring system operation even in the presence of a single channel failure.
The value of the CCC TIOC-555HD lies in its uncompromising fault tolerance, high reliability, and deterministic performance for the most demanding control environments. It is engineered to meet stringent standards such as DO-254 for airborne hardware design assurance and DO-160 for environmental testing. By implementing TMR architecture at the I/O level, it provides an extremely high level of safety integrity, preventing a single point of failure in the I/O subsystem from causing a hazardous event. For system architects in applications like fly-by-wire flight control, engine control (FADEC), or safety-critical industrial processes, the TIOC-555HD is a key building block that enables the design of systems with Design Assurance Level (DAL) A or Safety Integrity Level (SIL) 4 requirements, where failure is not an option.
Technical Specifications
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Parameter Name
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Parameter Value
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Product Model
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CCC TIOC-555HD
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Manufacturer
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Curtiss-Wright Controls
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Product Type
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Triple Modular Redundant (TMR) Input/Output Controller
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Architecture
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Triple Modular Redundancy (TMR) with 2-out-of-3 (2oo3) voting on all critical I/O channels. Three independent, synchronized channels (A, B, C) operate in lockstep.
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I/O Types & Density
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High-density mix of configurable I/O. Likely includes:
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Key Features and Advantages
CCC TIOC-555HD is distinguished by its inherent fault tolerance at the I/O layer. Its foremost advantage is providing true triple redundancy from the sensor/actuator interface inward. Unlike systems where redundancy starts at the processor, the TIOC ensures that a failure in a signal conditioner, an A/D converter, or an output driver in one channel is masked by the two healthy channels. This delivers an extremely high level of safety availability and prevents nuisance trips. The deterministic, lockstep operation of the three channels is critical for time-critical control loops.
Advanced diagnostics and high reliability design are engineered into its DNA. The module incorporates comprehensive Built-In Test (BIT) that can detect over 95% of potential faults. This includes monitoring for «stuck-at» faults, out-of-sync conditions, and invalid data. The ability to isolate a fault to a specific channel or component is essential for maintenance and system health management. Constructed with high-reliability (Hi-Rel) components and designed for harsh environments, it offers a long mean time between failures (MTBF), which is paramount in applications where maintenance access is limited (e.g., in-flight).
Seamless integration into safety-critical architectures is a key benefit. As a product from Curtiss-Wright, it is designed to work seamlessly with other TMR components (processors, communication modules) within a defined system architecture (e.g., for flight control or engine control). Its standard rugged form factors (ATR, VPX) and communication protocols (1553, ARINC 429) make it a preferred, off-the-shelf choice for aerospace integrators, reducing development risk and time compared to a custom-designed solution. In summary, the TIOC-555HD provides the robust, intelligent, and fault-tolerant «hands and senses» required for the most critical automated systems on earth.
Application Areas
The CCC TIOC-555HD is deployed in the most demanding, safety-critical control systems where failure could result in catastrophic consequences.
Its primary application domains are:
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Aerospace & Defense:
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Fly-by-Wire Flight Control Systems: Primary flight control actuation and surface position sensing.
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Full Authority Digital Engine Control (FADEC): Interface with engine sensors (temperature, pressure, speed) and fuel metering valves.
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Utility Management Systems: For landing gear, brakes, and other critical aircraft systems.
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Industrial Safety Systems:
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Nuclear Power Plant Protection Systems: Where the highest Safety Integrity Level (SIL 4) is required.
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Rail Transportation Control: For safety-critical train control functions.
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Essentially, it is used in any application that requires a Design Assurance Level (DAL) A per DO-178C/DO-254 or SIL 4 per IEC 61508, and where a TMR architecture is mandated to achieve the necessary level of fault tolerance and reliability.
Related Products
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TMR Processor Modules (e.g., from Curtiss-Wright): The triple-redundant main computers that the TIOC interfaces with.
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MIL-STD-1553 or ARINC 829 Interface Cards: For integration into the vehicle data network.
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Power Supply Modules: Ruggedized, redundant 28V DC or MIL-STD-704 compliant power supplies.
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Sensor & Actuator Specific Conditioners: LVDT/RVDT signal conditioners, solenoid drivers, though much of this may be integrated into the TIOC.
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System Integration & Testing Services: Provided by Curtiss-Wright or specialized integrators for these complex systems.
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Airborne Chassis/Enclosures: ATR racks or VPX backplanes for housing the module.
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