ICS Triplex Trusted TMR T8111C Modules

Technical Dossier

Product Details And Specifications

ICS Triplex Trusted TMR Series: Comprehensive Module Range and Technical Overview

The ICS Triplex Trusted TMR (Triple Modular Redundancy) 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 Trusted system achieves IEC 61508 SIL 3 certification through hardware-level fault tolerance: three independent processing channels vote continuously, with any single-channel failure producing no spurious trip and no loss of safety function. The T8111C is the primary CPU module of this architecture, executing the safety application logic and managing inter-channel communication across the TMR backplane. Its deployment base spans facilities operated by Shell, ExxonMobil, BP, Sinopec, and comparable tier-1 operators where unplanned downtime carries costs measured in millions per hour.

The Evolution of Trusted TMR Architecture

ICS Triplex introduced the Trusted platform in the early 1990s as a successor to its earlier TMR designs, targeting the gap between conventional PLCs and purpose-built safety systems. The original Trusted chassis used a parallel VME-derived backplane with discrete analog and digital I/O modules communicating over a proprietary TMR bus. Early CPU generations (T8100-series) operated at lower clock speeds with limited memory, constraining application size and scan rates in large process units.

The T8110 and T8111 generations introduced expanded memory maps, faster inter-channel arbitration, and improved diagnostics coverage. The T8111C specifically represents the mature revision of this CPU line, incorporating enhanced self-test routines, broader operating temperature tolerance, and compatibility with the Trusted Communications Interface (TCI) modules used in distributed architectures. Later Rockwell Automation acquisition of ICS Triplex (completed 2007) brought the platform under the Allen-Bradley safety portfolio, though hardware remained backward-compatible with pre-acquisition installations. The current migration path for end-of-life Trusted systems leads toward the Rockwell AADvance and subsequently the HIMA or Triconex platforms, though many operators maintain Trusted hardware in service well beyond nominal lifecycle due to the cost and complexity of SIS migration projects.

Trusted TMR Full Catalog & Functionalities (SKU List)

Processors & Controllers

• T8111C: Trusted TMR main processor module, SIL 3, TMR voting CPU for safety application execution
• T8110C: Earlier revision TMR processor, functionally equivalent to T8111C with reduced memory capacity
• T8100: First-generation Trusted CPU module, VME-based, limited to smaller application footprints
• T8151C: Trusted TMR processor with extended diagnostics and enhanced inter-channel communication

Digital Input Modules

• T8403: 24 VDC digital input module, 16-channel, TMR-voted, field-side isolated
• T8404: 24 VDC digital input module, 32-channel, high-density DI for large I/O counts
• T8431: 120 VAC digital input module, 16-channel, suitable for legacy field wiring
• T8432: 240 VAC digital input module, 16-channel, high-voltage field interface

Digital Output Modules

• T8453: 24 VDC digital output module, 16-channel, solid-state, TMR-voted output
• T8454: 24 VDC digital output module, 8-channel, high-current capacity per channel
• T8480: Relay output module, 8-channel, dry contact, for solenoid valve and shutdown actuator interfaces

Analog Input Modules

• T8310: 4–20 mA analog input module, 8-channel, TMR-voted, HART-capable
• T8311: 4–20 mA analog input module, 16-channel, high-density AI for process variable monitoring
• T8320: RTD/thermocouple analog input module, 8-channel, temperature measurement

Communications & Interface Modules

• T8831: Trusted Communications Interface (TCI) module, Ethernet-based inter-chassis link for distributed Trusted architectures
• T8840: Modbus RTU/TCP communications module, legacy DCS integration interface
• T8850: PROFIBUS DP communications adapter, field device integration for PROFIBUS networks

Power Supply Modules

• T8290: Trusted TMR power supply module, redundant 24 VDC input, chassis power distribution
• T8291: Trusted TMR power supply module, 120/240 VAC input variant, for AC-powered installations

Sourcing Hard-to-Find & Obsolete Trusted TMR Parts

The ICS Triplex Trusted platform entered end-of-active-production following Rockwell Automation's portfolio rationalization. Rockwell issued end-of-life notices for the majority of Trusted hardware lines, with last-time-buy windows now closed for most module types. This creates a structural supply problem for operators running Trusted-based SIS installations: OEM replacement stock is exhausted, and the only available inventory exists in the secondary market, in decommissioned plant equipment, or with specialist distributors who accumulated stock during the last-time-buy period.

DriveKNMS maintains a dedicated inventory of Trusted TMR modules including the T8111C processor and associated I/O, power, and communications modules. Our sourcing network covers decommissioned refinery and chemical plant equipment across Europe, North America, and Asia-Pacific. For operators requiring long-term maintenance support without committing to a full SIS migration, we provide: verified surplus stock with full traceability documentation, exchange programs for failed modules, and consignment evaluation for decommissioned Trusted hardware. Inquiries for specific part numbers, including obsolete revisions and early-generation modules, are handled directly by our technical team.

Quality Control for the Trusted TMR Range

Trusted TMR modules present specific verification challenges due to their TMR architecture: a module may pass basic power-on self-test while carrying a latent fault in one of its three processing channels, which would only manifest under specific voting conditions in a live system. DriveKNMS applies a structured test protocol for all Trusted modules prior to dispatch.

For T8111C and other CPU modules, testing includes: full power-on self-test completion verification, inter-channel communication integrity check using a reference Trusted chassis, application memory read/write cycle validation, and firmware revision confirmation against the customer's installed base. For I/O modules, each channel is exercised across its full input or output range with TMR voting behavior verified. Communications modules are tested for protocol handshake integrity against reference DCS or SCADA endpoints. All modules are inspected for backplane connector condition, capacitor condition on power supply boards, and conformal coating integrity. Test records are retained and available to customers on request.