TRICONEX 3625A Main Processor Tricon TMR Series

Technical Dossier

Product Details And Specifications

TRICONEX Tricon TMR Series Technical Notes

The Evolution of Tricon TMR Architecture

The TRICONEX Tricon platform was introduced in the mid-1980s as one of the first commercially available TMR safety controllers. The original Tricon architecture used a parallel backplane with three independent processing legs (Leg A, B, C), each executing identical logic and voting on outputs via a dedicated voter module. Early generations used proprietary TRICONEX TriBus backplane communication at fixed baud rates with limited diagnostics visibility.

The transition from Tricon v9 to v10 firmware introduced enhanced diagnostic coverage, expanded I/O point counts, and support for the TSAA (Triconex System Access Application) communication protocol over Ethernet. The 3625A represents the mature generation of Tricon main processors, compatible with the v10.x firmware baseline and supporting both legacy TriBus I/O modules and the expanded 3000-series I/O range. As Schneider Electric (which acquired Invensys/TRICONEX) has progressively migrated customers toward the Tricon CX platform, the 3625A and its contemporaries have entered a lifecycle phase characterized by high demand for spare parts and long-term maintenance support. Compatibility with existing chassis, I/O wiring, and application databases makes in-kind replacement the preferred strategy for most end users over full system migration.

TRICONEX Tricon TMR Full Catalog & Functionalities (SKU List)

Main Processors & Controllers

• 3625A: Tricon Main Processor Module, v10.x firmware, TMR architecture, dual Ethernet ports
• 3624: Tricon Main Processor Module, v9.x firmware baseline, single Ethernet port
• 3623: Tricon Main Processor, earlier v9 generation, limited TSAA support
• 3700A: Tricon Enhanced Intelligent Communication Module (EICM), Modbus/TSAA gateway
• 3701: Tricon Intelligent Communication Module (ICM), legacy Modbus RTU/TCP interface

Digital Input (DI) Modules

• 3501: 32-channel 24VDC Digital Input Module, TMR voting, field-side diagnostics
• 3503E: 32-channel 120VAC Digital Input Module, enhanced diagnostics, CE marked
• 3504E: 32-channel 240VAC Digital Input Module, high-voltage field wiring
• 3511: 16-channel 24VDC Digital Input Module, high-density, SIL 3 rated

Digital Output (DO) Modules

• 3601: 16-channel 24VDC Digital Output Module, solid-state, TMR voted outputs
• 3603E: 16-channel Relay Output Module, dry contact, enhanced diagnostics
• 3604E: 8-channel High-Current Relay Output Module, 5A per channel

Analog Input (AI) Modules

• 3703E: 8-channel 4–20mA Analog Input Module, HART pass-through, SIL 2/3
• 3704E: 16-channel 4–20mA Analog Input Module, high-density analog acquisition
• 3706A: 8-channel Thermocouple/mV Analog Input Module, cold junction compensation

Analog Output (AO) Modules

• 3805E: 8-channel 4–20mA Analog Output Module, TMR voted, HART capable

Power Supply Modules

• 8312: Tricon AC Power Supply Module, 120/240VAC input, redundant chassis power
• 8310: Tricon DC Power Supply Module, 24VDC input, for DC-powered installations

Communication & Chassis

• 4351B: Tricon Chassis, 8-slot, standard TMR backplane
• 4352B: Tricon Chassis, 16-slot, expanded I/O capacity

Quality Control for the TRICONEX Tricon Range

Tricon modules present specific test challenges due to their TMR backplane architecture. A module that passes single-leg functional tests may still exhibit inter-leg voting faults or TriBus communication errors that only manifest under full chassis load. DriveKNMS applies the following test protocol to all Tricon modules: