The TRICONEX 3501T is a high-performance Digital Input (DI) module designed for the Tricon Triple Modular Redundant (TMR) controller platform. It is engineered to interface with high-voltage field signals, supporting a nominal 115 VAC or VDC. As a TMR module, it utilizes three independent sensing circuits (branches) that perform 2-out-of-3 (2oo3) voting on every input signal before passing the data to the Main Processors. This ensures that the system maintains high safety integrity and avoids false signals caused by single-component failures in the input circuitry.
Product Specifications
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Model Number: 3501T
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Part Number: 3000803-310 / 3000803-350
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Input Type: TMR Digital Input (Isolated)
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Number of Channels: 32 Points
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Nominal Voltage: 115 VAC/VDC
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Input Voltage Range: 90–155 VAC/VDC
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Frequency Range: 47–63 Hz (for AC signals)
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Dimensions: 380 mm x 300 mm x 30 mm
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Weight: 2.15 kg
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Country of Origin: USA
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Self-Test Diagnostics: Continuous hardware and software integrity checks
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Isolation: 1500 VDC (Field circuit to logic)
Application Fields
The 3501T is a staple in critical safety systems where high-voltage monitoring is required. It is commonly used in Emergency Shutdown (ESD) systems, Fire and Gas (F&G) detection, and Burner Management Systems (BMS). Its ability to handle 115V makes it ideal for utility power plants, refineries, and chemical processing facilities where standard field switches, limit switches, and push-buttons operate on high-voltage DC battery banks or AC power circuits.
Product Instructions
Installation must be performed within a Tricon TMR chassis. The module should be inserted into the designated I/O slot until the levers are fully engaged. The 3501T requires an External Termination Panel (ETP) to facilitate field wiring. When wiring AC signals, ensure that all phase and neutral connections are properly identified and fused. The module supports “Hot-Swapping,” which allows a technician to replace a faulty module while the controller remains online. Upon insertion of a new module, the Tricon system automatically synchronizes the state of the new hardware with the active processors to ensure bumpless operation.
FAQ: Common Questions and Answers
Q: Can the 3501T handle both AC and DC signals simultaneously? A: While the hardware is capable of reading both, it is highly recommended to use the same voltage type (either all AC or all DC) across the points of a single module to simplify wiring and avoid noise interference.
Q: What is the significance of the “T” in the model name? A: The “T” typically indicates TMR (Triple Modular Redundant) capability, highlighting that the module performs internal 2-out-of-3 voting to ensure the highest reliability of input data.
Q: How does the module handle a “stuck” input signal? A: The 3501T features sophisticated “Hot-Spot” and “Stuck-On” diagnostic routines. If an input circuit fails in a way that locks the signal state, the module will report a fault to the TriStation software while the remaining two redundant branches maintain the correct process state.
Find professional support and technical documentation for the TRICONEX 3501T to enhance your industrial safety architecture.
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