Triconex 338S2 - Triple Redundant Analog Input Module for Safety Instrumented Systems

Triconex 338S2 – Triple Redundant Analog Input Module for Safety Instrumented Systems

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Product Introduction:
The Triconex 338S2 is a high-integrity analog input module designed exclusively for Triconex Safety Instrumented Systems (SIS). This module is part of the Triconex Triple Modular Redundancy (TMR) architecture, which is the gold standard for safety-critical applications in oil and gas, chemical processing, and power generation. The “338” designates it as an 8-channel analog input board, while the “S2” suffix indicates Series 2 hardware, representing a refined and enhanced revision with improved diagnostics, faster scan rates, and better thermal management compared to the original Series 1. This board converts field analog signals (4-20mA, 1-5V, RTD, Thermocouple) into digital data that the Triconex safety controller uses to execute emergency shutdown logic with SIL 3 (Safety Integrity Level 3) certification.

Technical Specifications:
Board Type: Triple Redundant Analog Input Module
Series: Series 2 (S2)
Channels: 8 single-ended or 4 differential analog input channels
Input Types: 4-20mA, 1-5V, 0-10V, RTD (Pt100, Pt1000, Cu10, Ni120), Thermocouple (Types J, K, T, E, R, S, B, N)
Resolution: 16-bit A/D conversion
Accuracy: +/- 0.1% of full scale
Scan Rate: 10ms per channel (configurable down to 1ms for critical loops)
Isolation: 1500V RMS channel-to-channel and channel-to-ground galvanic isolation
Redundancy: Full TMR (Triple Modular Redundancy) with continuous self-testing
Diagnostics: Per-channel burnout detection, wire break detection, short circuit detection, and out-of-range alarm
Voting Logic: Three processors compare results every scan cycle; 2-out-of-3 voting ensures a single fault never causes a spurious trip
Operating Temperature: 0 to 60 degrees Celsius (standard); extended range available
Form Factor: Triconex standard module (fits in any Triconex 3000 series controller)
Power Consumption: Approximately 5 Watts
Certifications: SIL 3, IEC 61508, ATEX, FM Class I Div 2