ICS Triplex Trusted TMR T8111C Modules

Technical Dossier

Product Details And Specifications

ICS Triplex Trusted TMR Series Technical Notes

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

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.