TRICONEX 3625A Main Processor: Tricon TMR Series

Technical Dossier

Product Details And Specifications

TRICONEX Tricon TMR Series: Comprehensive Module Range and Technical Overview

The TRICONEX Tricon Triple Modular Redundancy (TMR) platform is one of the most widely deployed Safety Instrumented System (SIS) architectures in global heavy industry. Installed across petrochemical complexes, nuclear power stations, offshore platforms, LNG terminals, and refinery process units, the Tricon system is certified to IEC 61511 and IEC 61508 SIL 3. The 3625A Main Processor is a core compute module within the Tricon chassis, responsible for executing the safety application logic, managing inter-chassis communication, and coordinating the three independent processing legs that define TMR architecture. Its installed base spans facilities operated by major NOCs and IOCs across North America, the Middle East, and Asia-Pacific, making long-term parts availability a critical operational requirement.

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

Sourcing Hard-to-Find & Obsolete TRICONEX Tricon Parts

As Schneider Electric has transitioned its SIS portfolio toward the Tricon CX and Tricon v11 platforms, a significant portion of the 3000-series Tricon module range has been discontinued or placed on limited availability. End users operating legacy Tricon installations face extended lead times from OEM channels, with some modules carrying 26–52 week delivery windows or being listed as no longer manufactured.

DriveKNMS maintains a dedicated inventory of tested, pull-out, and refurbished TRICONEX Tricon modules sourced from decommissioned systems and authorized surplus channels. For the 3625A specifically, DriveKNMS provides: verified firmware revision matching, full functional test against Tricon diagnostic protocols, and documentation of test results. For facilities requiring lifecycle extension beyond OEM support windows, DriveKNMS offers consignment stocking agreements and priority allocation for critical spare holdings.

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:

• Full chassis insertion test with active TMR backplane — all three legs energized simultaneously
• TriBus communication integrity verification at rated baud rate
• Firmware version identification and logging against customer-specified revision requirements
• For the 3625A: Ethernet port continuity, TSAA handshake test, and application memory read/write cycle verification
• For I/O modules: channel-by-channel signal injection and output verification against rated accuracy specifications
• 48-hour burn-in under simulated load prior to shipment for critical processor modules
• Full ESD-compliant handling, anti-static packaging, and serialized test report issued with each unit

© 2026 DriveKNMS. All trademarks belong to their respective owners. Specifications are for reference only and subject to change without notice. Verify all parameters against official documentation before installation.