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+86 18030182217
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Triconex 3505E Digital Input Module
Product Overview
The Triconex 3505E is a high-reliability digital input module designed for safety-critical industrial automation systems. As part of the Triconex Trident Safety Instrumented System (SIS) ecosystem, this module provides secure and redundant signal acquisition for discrete field devices such as switches, sensors, and relays. Engineered with Triple Modular Redundancy (TMR) architecture, the 3505E ensures continuous operation even in the presence of single-point failures, making it ideal for applications requiring SIL 3 compliance under IEC 61508:2010.
Featuring 32 isolated digital input channels, the 3505E supports 24 VDC operation and includes advanced diagnostic capabilities to detect open circuits, short circuits, and ground faults. Its galvanic isolation (1,500 VAC) protects against electrical noise and transient voltage spikes common in harsh industrial environments. The module’s hot-swap functionality allows online replacement without system interruption, minimizing downtime during maintenance.
Leveraging Triconex’s Total Fault Management (TFM) technology, the 3505E provides real-time diagnostic feedback through LED indicators and chassis alarms, enabling proactive fault resolution. Its compact design and compatibility with Trident chassis simplify integration into existing distributed control systems (DCS), while industry-standard certifications (CE, UL, FM, CSA) ensure global applicability.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | Triconex 3505E |
| Manufacturer | Triconex |
| Product Type | Digital Input Module (TMR Redundant) |
| Input Configuration | 32 isolated channels (24 VDC) |
| Voltage Range | 20–28 VDC (continuous operation) |
| Isolation | 1,500 VAC (channel-to-logic) |
| Fault Detection | Open circuit, short circuit, ground fault, and signal degradation |
| Operating Temperature | 0°C to +60°C |
| Storage Temperature | -40°C to +85°C |
| Power Supply | 24 VDC ±15% |
| Dimensions | 120 mm (height) × 80 mm (width) × 30 mm (depth) |
| Weight | 0.7 kg |
| Certification | SIL 3-compliant platform (IEC 61508:2010), CE, UL, FM, CSA |
Main Features and Advantages
Triple Modular Redundancy (TMR): The 3505E uses three independent processing channels to compare inputs and detect discrepancies, ensuring fault tolerance and continuous operation. This architecture aligns with Triconex’s SIL 3-certified platform, providing a fail-safe design for critical applications.
Wide Voltage Compatibility: Supporting a narrow 24 VDC input range, the 3505E is optimized for systems requiring precise voltage thresholds, reducing the risk of false signals from voltage fluctuations.
Comprehensive Diagnostics: Built-in loop-back verification and real-time monitoring of signal integrity enable early detection of faults, minimizing unplanned downtime. Diagnostic data is logged with timestamps for root-cause analysis.
High Isolation and Noise Immunity: The module’s 1,500 VAC isolation protects against electrical interference, ensuring reliable signal acquisition in noisy industrial settings. This feature is critical for applications near high-voltage equipment or electromagnetic sources.
Hot-Swap Capability: Online replacement of the 3505E without system shutdown enhances maintenance efficiency, a key requirement for industries where even brief outages can lead to significant losses.
Self-Test for Stuck-On Inputs: The module can self-test to detect stuck-on conditions, a critical feature for safety systems configured with de-energize-to-trip logic. By simulating a zero input (off state), the 3505E verifies signal integrity and ensures fail-safe operation .
Application Areas
The Triconex 3505E excels in safety-critical applications across industries:
- Oil & Gas: Monitors emergency shutdown (ESD) valves, fire and gas detectors, and wellhead pressure switches on offshore platforms and refineries.
- Power Generation: Controls turbine trip systems, generator breaker status, and boiler interlocks to prevent catastrophic failures.
- Chemical Processing: Manages reactor safety interlocks, agitator status, and pressure relief valve positions to ensure compliance with OSHA and EPA standards.
- Pharmaceuticals: Ensures cleanroom access control and sterilization process validation by monitoring sensor inputs for ISO 14644-1 compliance.
In each scenario, the 3505E’s combination of TMR redundancy, diagnostic rigor, and fail-safe design makes it a preferred choice for mission-critical control functions.
Related Products
- Triconex 3503E: Digital input module supporting 24 VAC/DC with 32 channels, optimized for mixed-voltage environments.
- Triconex 3564: High-density digital input module with 64 channels, suitable for space-constrained applications.
- Triconex 3009X: Main processor module that coordinates I/O modules like the 3505E in Trident systems.
- Triconex 5354AS2: Communication interface module enabling integration with Modbus TCP/IP and Ethernet/IP networks.
- Triconex 8310: Power supply module ensuring stable energy distribution to chassis components.
- Triconex 3636T: Non-triplicated relay output module for non-critical control functions.
These products complement the 3505E in building scalable, high-integrity control systems.
Installation and Maintenance
Installation Preparation:
Ensure the Trident chassis is powered off and properly grounded before installing the 3505E. Verify compatibility with the chassis backplane and external termination panel (ETP). Use Triconex’s TriStation 1131 software to configure input voltage thresholds and diagnostic sensitivity. The module’s keyed design prevents misalignment, ensuring secure electrical connections.
Ensure the Trident chassis is powered off and properly grounded before installing the 3505E. Verify compatibility with the chassis backplane and external termination panel (ETP). Use Triconex’s TriStation 1131 software to configure input voltage thresholds and diagnostic sensitivity. The module’s keyed design prevents misalignment, ensuring secure electrical connections.
Maintenance Recommendations:
Regularly inspect the 3505E for loose connections or physical damage. Utilize the module’s diagnostic LEDs and TriStation software to monitor channel health. For faulted channels, perform hot-swap replacement using a certified spare module to maintain system continuity. Schedule annual calibration checks to ensure input thresholds remain within ±5% of rated values.
Regularly inspect the 3505E for loose connections or physical damage. Utilize the module’s diagnostic LEDs and TriStation software to monitor channel health. For faulted channels, perform hot-swap replacement using a certified spare module to maintain system continuity. Schedule annual calibration checks to ensure input thresholds remain within ±5% of rated values.
Product Warranty
The Triconex 3505E comes with a 1-year warranty covering defects in materials and workmanship. This includes free repair or replacement of faulty components, backed by a global network of Triconex-certified technical support. Customers receive access to detailed documentation, firmware updates, and 24/7 assistance to address operational challenges, underscoring the module’s reliability and the manufacturer’s commitment to long-term value.
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