The Triconex 3624 is a high-reliability Supervised Digital Output (SDO) module designed for use within the Tricon Triple Modular Redundant (TMR) system. This module is a critical component for safety-instrumented systems (SIS), providing 16 isolated output points. The “Supervised” designation means the module continuously monitors the integrity of both the internal circuitry and the external field wiring, detecting open circuits or short circuits even when the output is in the “Off” state. This ensures that safety-critical actuators, such as Emergency Shutdown (ESD) valves, are ready to perform when called upon.
Product Specifications (Datasheet)
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Model: 3624
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Module Type: Supervised Digital Output (SDO)
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Output Points: 16 Points, commoned in groups of 8
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Dimensions: 430 mm x 300 mm x 31 mm (H x D x W)
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Weight: 1.55 kg
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Country of Origin: USA
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Nominal Voltage: 24 VDC
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Operating Range: 22 VDC to 30 VDC
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Maximum Load Current: 2.0 A per point (max 10 A per module at 60°C)
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Minimum Load: 10 mA (required for supervised functionality)
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TMR Architecture: Triple Modular Redundant (Three isolated legs)
Key Application Fields
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Emergency Shutdown Systems (ESD): Driving critical valves and dampers in oil and gas refineries.
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Fire and Gas Systems (F&G): Activating alarms, suppression systems, and ventilation controls.
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Burner Management Systems (BMS): Controlling fuel valves and ignition sequences in industrial boilers.
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Nuclear Power: Managing safety-related control loops and trip functions.
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Turbine Control: High-availability output control for steam and gas turbines.
Product Usage Instructions
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Module Insertion: Slide the 3624 module into the assigned slot of the Tricon chassis. Ensure the module is firmly seated against the backplane and the top and bottom fasteners are secured.
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Field Wiring: Connect field devices to the External Termination Panel (ETP) associated with the 3624. Use the recommended wire gauge to handle the 2A peak current per point.
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Supervision Configuration: Ensure that your field load meets the minimum 10 mA requirement. If using high-impedance loads, a “dummy load” resistor may be necessary to prevent nuisance “Open Circuit” alarms.
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TMR Setup: The Tricon system automatically performs voting across the three internal legs. No manual synchronization is required, but you must verify the module status via the TriStation 1131 software.
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Hot-Sparing: For maximum availability, install a second 3624 module in the adjacent “Hot-Spare” slot. This allows for seamless module replacement or testing without interrupting the process.
Q&A: Frequently Asked Questions
Q: What exactly does “Supervised” mean for this module? A: It means the module performs “Line Monitoring.” It sends a tiny, non-actuating pulse through the circuit to check for continuity (open circuit) and checks for current leakage (short circuit).
Q: Can I use the 3624 for AC loads? A: No, the 3624 is strictly for 24 VDC applications. For AC requirements, a different Triconex output module (like the 3603T) must be used.
Q: How does the module handle a “Fault” state? A: In a TMR system, if one of the three internal legs fails, the other two continue to control the output correctly. A “Fault” LED will light up on the front panel to signal that the module should be replaced.
Q: What is the purpose of the “Common” groups? A: The 16 points are split into two groups of 8. This allows you to use different power sources for each group if needed for segmenting your safety loops.
Check the stock and technical details for the 3624 and other Triconex TMR safety modules to maintain your plant’s protection systems.
Similar Model Recommendations
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Triconex 3625: A similar 24 VDC digital output module but designed for higher current or different supervision thresholds.
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Triconex 3604E: A 24 VDC digital output module specifically for non-supervised common applications.
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Triconex 3664: A dual-output module used in systems where specific isolation requirements are higher.
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Triconex 3721: An analog input module often paired with the 3624 in comprehensive SIS solutions.
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Triconex 3503E: A digital input module used to trigger the safety logic that drives the 3624 outputs.
