TRICONEX DI3361 Density Digital Input Safety Module

I. Overview

II. Core Features

(1) High Channel Density and Flexible Signal Adaptation

(2) Triple Modular Redundancy Design Ensures Safety and Reliability

(3) Enhanced Anti-Interference and Electrical Isolation

(4) Real-Time Diagnosis and Fault Early Warning

III. Technical Specifications

(1) Electrical Parameters

(2) Mechanical and Environmental Parameters

• Overall Dimensions: 160mm×120mm×80mm (Length×Width×Height), compatible with TRICONEX standard racks, installed with 2U height

• Weight: Approximately 0.8kg, lightweight design facilitates module insertion/extraction and cabinet layout

• Operating Temperature Range: -40℃~+70℃, meeting the usage requirements of extremely cold areas (such as northern oilfields) and high-temperature workshops (such as glass factories)

• Storage Temperature Range: -40℃~+85℃, adapting to long-distance transportation and storage environments

• Protection Level: IP20 (front panel), suitable for installation in industrial control cabinets

• Vibration Resistance: 5g acceleration (10Hz~2000Hz), complying with IEC 60068-2-6 standard

(3) Performance Parameters

• Signal Response Time: ≤1ms (from signal trigger to valid module output)

• Diagnostic Coverage: ≥99.9% (channel-level fault diagnosis)

• MTBF (Mean Time Between Failures): ≥1,000,000 hours (complying with MIL-HDBK-217 standard, at 25℃ environment)

• Communication Interface: Compatible with TRICONEX TMR system bus, data transmission rate ≥100Mbps

IV. Functions and Working Principles

(1) Digital Signal Collection Process

• Signal Access and Isolation: Digital signals from industrial sites (such as switch contact signals) are connected to the corresponding channels of the DI3361 through shielded cables. Each signal first passes through a photoelectric isolation circuit to achieve electrical isolation from the internal power supply and control circuit of the module, preventing external interference from entering the core circuit of the module.

• Signal Conditioning and Detection: The isolated signal enters the channel-level conditioning circuit. Spike pulse interference is suppressed through current-limiting resistors and filter capacitors. Then, a high-speed comparator converts the analog signal into a standard digital level (high level ≥18V DC, low level ≤5V DC) and detects the signal stability (debounce time can be set to 1ms~100ms via software).

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• Triple Modular Data Verification: Three independent collection units inside the module synchronously read the conditioned digital signals and transmit the three sets of data to the verification logic unit through the internal redundant bus. The verification unit performs "two-out-of-two" or "two-out-of-three" judgment on the three sets of data (according to system configuration). If the three sets of data are consistent, the valid signal is uploaded; if a single set of data is abnormal, the fault channel is marked and the output is generated using the two sets of normal data.

• Data Transmission and Diagnostic Feedback: The verified valid signal is transmitted to the main controller through the TRICONEX system bus. At the same time, the diagnostic unit uploads the channel status (normal/open circuit/short circuit) in real time, and the working status of each channel is displayed on the upper computer monitoring interface, facilitating operation and maintenance personnel to grasp the module operation status in real time.

(2) Cooperative Working Mechanism with TMR System

• Data Synchronization: The module synchronously sends the collected digital signals to the three controller units every 1ms. The controller performs consistency verification on the three sets of signals to ensure that the control logic is executed based on true and reliable input signals.

• Fault Tolerance: If a single collection channel of the DI3361 fails, the controller can automatically ignore the abnormal data of that channel through the diagnostic information uploaded by the module and perform logical operations based on the other two sets of normal signals, preventing the system from triggering incorrect actions due to a single I/O fault.

• Online Maintenance: Without shutting down the TMR system, the DI3361 can be replaced online via hot swapping. The system will automatically identify the new module and quickly complete parameter configuration and data synchronization. Signal collection remains uninterrupted during the replacement process, meeting the "non-stop maintenance" requirement of industrial production.