Triconex 3481S2 - Triple Redundant 16-Channel Discrete Output Module for Safety Instrumented Systems

Triconex 3481S2 – Triple Redundant 16-Channel Discrete Output Module for Safety Instrumented Systems

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Product Introduction:
The Triconex 3481S2 is a 16-channel discrete (digital) output module for Triconex Safety Instrumented Systems. This board is the “muscle” of the safety system, converting digital commands from the safety controller into physical actions by energizing or de-energizing field devices such as solenoid valves, relay coils, indicator lamps, and motor starters. The “3481” identifies it as a 16-channel discrete output, and “S2” indicates Series 2 hardware. Within the TMR architecture, all three processors must agree to energize an output before it activates, ensuring that a single processor fault never causes a spurious valve actuation. This module is SIL 3 certified and is used to execute the final shutdown commands in emergency shutdown systems.

Technical Specifications:
Board Type: Triple Redundant Discrete Output Module
Series: Series 2 (S2)
Channels: 16 discrete output channels
Output Type: Dry contact relay (Form A, Form B, Form C) or transistor (NPN/PNP)
Contact Rating: 5 Amps at 125V DC or 250V AC (relay); 500mA at 24V DC (transistor)
Voltage: 24V DC, 48V DC, 120V DC, 240V AC (per channel configurable)
Response Time: Less than 10ms from command to output change
Isolation: 1500V RMS opto-isolated
Redundancy: Full TMR with 2-out-of-3 voting
Diagnostics: Per-channel LED, coil supervision (detects open or shorted coils), stuck-at detection
Operating Temperature: 0 to 60 degrees Celsius
Form Factor: Triconex standard module
Power Consumption: Approximately 6 Watts
Certifications: SIL 3, IEC 61508, ATEX, FM Class I Div 2

Functional Features:
Coil Supervision: Continuously monitors the current through each output relay coil. If a coil burns open or shorts, the module detects the fault and alarms immediately.
Stuck-At Detection: Detects if a relay contact is welded shut or stuck open, preventing dangerous false indications.
Per-Channel Latching: Supports both momentary (pulse) and latching (maintained) output modes, essential for solenoid valves that require a pulse to open and a pulse to close.
Fail-Safe Default: On loss of power or communication, all outputs go to a predefined safe state (typically de-energized for ESD solenoids).
Sequencing Support: Can be programmed to energize outputs in a specific sequence (e.g., “Close Valve A, wait 500ms, then Close Valve B”).
LED Indicators: Bright per-channel LEDs show output status without needing software.