Triconex Model 3351 Analog Input Module

Tricon and Tricon CX  High-integrity +  high-availability system

The TriconTM high-integrity/high-availability system meets the needs of safety and critical 

control applications in oil and gas, power, refining, chemicals, pharmaceutical, and biotech  industries. 

It is based on industry-leading TMR technology, is easy to operate and maintain,  and provides a higher value of ownership.

KEY CAPABILITIES
•    TÜV Certified up to SIL3 applications in accordance with International standard IEC61508
•    Easily integrated with all major Distributed Control Systems
•    On-line module replacement ensures plant availability by hot-swapping of modules
•    Works with both centralized and distributed applications
•    Comprehensive family of I/O modules
•    HART protocol pass through to Asset Management Systems
•    Fast program cycle time for TMC applications
•    Expertise available from our TÜV certified Functional Safety Experts and Engineers
•    Certified for use in non-incendive applications

TRICONEX TRIPLE MODULAR REDUNDANCY
Tricon operation is based on the principle of safety and high plant availability, which identifies and 
compensates for failed control system elements and allows on line replacement while continuing 
its assigned task without interrupting the controlled process. Fault Tolerance is achieved through 
TMR technology.
TMR employs three isolated, parallel control systems and extensive diagnostics integrated into one 
system. The Tricon system uses two-out-of-three (2oo3) voting to provide high integrity, error-free, 
uninterrupted process operation with no single point of failure. Setting up applications is simplified 
with the Tricon, because the TMR system operates as a single control system from the user’s point of 
view. The extensive diagnostics are inherent and transparent to the programmer.
Use of the Tricon continues to expand into new industries and applications as customers require 
increased system safety and/or high availability. Today, Invensys has delivered and installed Triconex 
safety system solutions in over 70 countries, providing increased safety and high process uptime.

variables 

• Safe-state (FAILOPT) behaviors configurable on a 

per channel basis 

• Output read-back and alarm on discrepancy 

• Non-incendive output 

Series 8 I/O Overview 

This document provides technical information to configure the Series 8 I/O. 

The following Series 8 I/O items are included in this document. 

• TC/RTD 

• Analog Input – Single Ended 

• Analog Input with HART – Single Ended 

• Analog Input with HART – Differential 

• Analog Output 

• Analog Output with HART 

• Digital Input Sequence of Events (SOE) 

• Digital Input, 24 VDC 

• Digital Input Pulse Accumulation 

• Digital Output, 24 VDC 

• DO Relay Extension Board

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