3401 Triconex 3401 TMR Digital Output Module | High-Safety 24VDC Unit

Product Overview

• The 3401 is a high-performance Triple Modular Redundant (TMR) Digital Output Module by Triconex.
• It integrates three isolated electronics channels to ensure fault-tolerant operation for critical safety loops.
• This module utilizes patented Quad Voter circuitry to provide voting on individual output signals.
  

Global PLC Spare HUB's Insight

• The 3401 represents the gold standard in functional safety for SIS (Safety Instrumented Systems).
• The Quad Voter architecture is a parallel-series switch matrix that passes power only if two of the three channels command a close.
• Its Output Voter Diagnostic (OVD) routine is exceptionally fast, detecting "stuck-on" or "stuck-off" faults in less than 500 ms.
• With a diagnostic glitch duration of typically only 500 μs, the 3401 monitors its health without tripping sensitive field loads.
• The 800 VDC logic-to-earth isolation makes the 3401 module resilient against significant electrical noise and ground potential shifts.

Technical Specifications

• Brand: Triconex (Schneider Electric)
• Model: 3401
• Type: TMR Digital Output (DO) Module
• Output Points: 16 points, commoned
• Nominal Voltage: 24 VDC (Operational range: 15 to 30 VDC)
• Maximum Current: 3.0 A typical (Self-limiting < 4.8 A)
• Leakage to Load: < 1 mA in Off state
• On-State Voltage Drop: < 1.0 VDC @ 1.5 A
• Isolation: 500 VDC Functional Earth to Protective Earth / 800 VDC Logic isolation
• Scan Time: Loop-back scan time < 1.0 ms for all 16 points
• Fault Detection: Integrated OVD for switch and drive circuitry monitoring

Targeted Equipment & Application

• Triconex TMR Systems: Essential for 3008/3009 Main Processors in safety-critical racks.
• Emergency Shutdown (ESD): Controlling isolation valves and fire suppressors.
• Fire & Gas Systems (F&G): High-reliability activation of alarms and beacons.
• Burner Management Systems (BMS): Safe management of fuel and ignition sequences.
• Hot-Spare Support: Allows for redundant slot configuration to ensure zero-interruption maintenance.

Diagnostics & Operational Capability

• Fault Indicators: Individual channel LEDs notify operators of component failure before the module loses functionality.
• Output Voter Diagnostic (OVD): Automatically tests output switches without disrupting the process state.
• Loop-back Thresholds: Real-time verification of field voltage to confirm the load is in the commanded state.
• Field Alarms: Detects loss of field power and shorted output points (On or Off) instantly.

Shipping and Warranty

• Box List: One (1) Triconex 3401 TMR Digital Output Module.
• Warranty: Professional 12-month quality guarantee on all 3401 units.
• Fulfillment: Fast dispatch within 24-48 hours.
• Courier Service: Reliable global shipping via FedEx, UPS, and DHL.

FAQ & Selection Advice

• What happens if one of the three channels in the 3401 module fails?
• The Fault LED illuminates to alert maintenance, but the module continues to operate safely using the remaining two channels.
• Is the "diagnostic glitch" visible to my field instruments?
• With a duration typically under 500 microseconds, most industrial loads are too slow to respond, ensuring process stability.
• Can I install the 3401 in any Triconex baseplate slot?
• No, the 3401 is mechanically keyed to prevent installation into a slot configured for a different module type.
• What is the purpose of the 4.8 A self-limiting feature?
• It protects the Quad Voter circuitry from catastrophic failure in the event of an external short circuit.
• Does this module support online replacement?
• Yes, the 3401 supports a hot-spare configuration, allowing for seamless online swaps.
• Selection Advice: When ordering the 3401, verify your field voltage is within the 15-30 VDC range. For high-current solenoid applications, ensure the 3.0A typical rating matches your inrush requirements. We recommend verifying your system's Main Processor firmware compatibility to ensure full OVD functionality.

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