Triconex 3351 TMR Analog Input Module for Safety Systems

Overview of the Triconex 3351 Analog Input Module

The Triconex 3351 is a Triple Modular Redundant (TMR) analog input module.
This module features three isolated sets of electronics called channels.
Each channel independently processes field data for maximum fault tolerance.
The Triconex 3351 supports 32 commoned analog input points.
You can use this module in both TMR mode and dual mode operations.
In TMR mode, the system passes the mid-value of three channels.
In dual mode, the system passes the average value.
This design guarantees proper operation with a single channel fault.

Technical Specifications of the 3351 AI Module

Below are the complete technical parameters for this input module.

TMR Architecture and Fault Handling

The Triconex 3351 uses triple isolation for each analog channel.
Each channel places processed data into an array for transmission.
The MP associated with each channel requests this data array.
All three MPs vote on the data before passing it to your application.
Complete ongoing diagnostics run for every channel continuously.
If diagnostics detect a failure, the Fault indicator turns on.
This fault indicator identifies a specific channel fault only.
The Triconex 3351 may continue properly even with multiple faults.
Diagnostic Force-to-value (FVD) testing is supported on this module.

Compatible Baseplates for the Triconex 3351

The Triconex 3351 requires a specific baseplate for operation.

• Model 2351: For typical 4-20 mA applications

• AI External Termination Baseplate: Works with Model 9764-510 RTD/TC/AI panel or Model 9792-310 hazardous location panel

• Model 2354: For 4-20 mA with HART communication to asset management software

• Model 2354A: For hazardous location 4-20 mA with HART communication

Each Triconex 3351 module is mechanically keyed for proper installation.
This keying prevents incorrect mounting into a configured baseplate.

Hot-Spare Support and Mechanical Design

The Triconex 3351 fully supports a hot-spare module configuration.
You can replace a failed module without shutting down the system.
The module features robust mechanical construction for industrial environments.
All field wiring connects through the chosen baseplate termination.
The Triconex 3351 fits standard Tricon chassis slots.
This module provides 16 Hz input bandwidth for process signal filtering.

Installation Guidelines for the 3351 Module

Follow these steps for correct installation of the Triconex 3351.

1. Verify power to the chassis is completely removed.

2. Confirm your baseplate matches one of the supported models.

3. Check the mechanical keying on the baseplate slot.

4. Slide the Triconex 3351 gently into the designated slot.

5. Press firmly until the module locks into place.

6. Connect all field wiring to the termination panel.

7. Apply power and observe the status indicators.

8. Wait for the module to complete its self-diagnostic routine.

Only trained safety system technicians should install this module.

Package Contents for the Triconex 3351

• One Triconex 3351 TMR Analog Input Module

• Module extraction tool for safe removal

• Anti-static transport bag

• Protective dust cover for unused slots

• Quick reference installation card

Common FAQs About This Triconex AI Module

Q1: Can the 3351 accept both analog and digital inputs?
A1: No, the standard Triconex 3351 handles 32 analog inputs only. A separate AI/DI version provides 16 digital and 16 analog points.

Q2: What happens if one channel fails on the 3351?
A2: The Triconex 3351 continues operating properly with a single fault. The Fault indicator turns on, but the module passes voted data correctly.

Q3: Does the 3351 support HART communication?
A3: Yes, but only when using Model 2354 or 2354A baseplates. These baseplates enable HART pass-through to asset management software.

Q4: What is the scan time for all 32 points?
A4: The Triconex 3351 scans all 32 points in less than 1 millisecond. This fast scan supports high-speed safety applications.

Q5: Is the 3351 compatible with the Model 2351 baseplate?
A5: Yes, the Triconex 3351 works perfectly with Model 2351 for standard 4-20 mA applications without HART requirements.

Ordering and Compatibility Information

This Triconex 3351 ships from our global distribution center.
We use anti-static packaging to protect sensitive electronics.
Contact our team for volume pricing on Triconex spare parts.
Always verify your existing baseplate model before ordering.
Express shipping options are available for urgent breakdowns.