The ICS Triplex T8111C (Trusted™ T8111) is a high-availability, safety-critical main processor module designed by Rockwell Automation for the Trusted Triple Modular Redundant (TMR) system. Operating under a Hardware Implemented Fault Tolerant (HIFT) lock-step configuration, it contains three independent execution domains. The module executes control algorithms, handles systemic I/O scanning, and performs deep background diagnostics to satisfy rigorous SIL 3 safety integrity criteria without incurring false trips or system downtime.
The “C” designation explicitly signifies the presence of a premium Conformal Coating (CCoat) on all internal electronics. This provides Class G3 atmospheric protection, guarding surface-mount chips against humidity, saline air, and corrosive gases such as Hydrogen Sulfide (H_2S) or Chlorine (Cl_2).
Product Specifications
Technical & Architectural Parameters
- Model Identification: T8111C / T8111
- Manufacturer: ICS Triplex (Rockwell Automation)
- System Architecture: Triple Modular Redundant (TMR), lock-step execution
- Fault Tolerance Configuration: 3-2-0 fault degradation path
- Processor Core: 3x Motorola/NXP PowerQUICC® II Series processors (one per Fault Containment Region – FCR)
- Voting Mechanism: Two-Out-of-Three (2oo3) voted hardware memory read access between FCRs
- Maximum Application Memory Capacity: 960 KB
- Sequence of Events (SOE) Storage: 1,000 deep cyclical event buffer
- Backplane (IMB) Operating Range: 20 VDC to 32 VDC
- Power Dissipation Profile: 30 Watts (Nominal continuous load)
Physical Datasheet
- Form Factor: Specialized multi-channel plug-in module for the Trusted Controller Chassis (T8100)
- Dimensions (H × W × D): 304mm x 93mm x 265mm (12.0″ x 3.66″ x 10.43″)
- Weight: 3.06 kg (6.75 lbs)
- Country of Origin: USA / UK
- Operating Temperature Constraints: 0°C to +60°C (+32°F to +140°F)
- Storage Environment Limits: -25°C to +70°C (-13°F to +158°F)
- Relative Humidity Tolerances: 5% to 95% non-condensing
Application Fields
The T8111C acts as the primary compute module in high-stakes automation environments:
- Emergency Shutdown (ESD) Networks: Instantly triggering isolation procedures during thermal or chemical imbalances.
- Critical Burner Management Systems (BMS): Overseeing critical ignition, air-to-fuel balance, and purging routines in heavy boilers.
- High Integrity Pressure Protection Systems (HIPPS): Rapid-acting valve management designed to handle massive pressure waves in pipelines.
- Fire & Gas (F&G) Systems: Aggregating wide-area optical flame and electrochemical gas sensor metrics into actionable safety responses.
Product Usage Instructions
- Online Insertion & Hot-Swapping: The T8111C supports seamless Hot Replacement. It can be inserted into an active, powered backplane without downing the application layer. The module will automatically sync its memory registers with the active standby controllers via hardware voting lines.
- Backplane Alignment: Slide the heavy-frame module gently down the chassis guide tracks to prevent connector pins from binding. Fully lock the top and bottom front panel levers to secure the Inter-Module Bus (IMB) link.
- Interface Adapter Integration: To enable external system connectivity, the rear of the chassis must be populated with a companion T8121 or T8120 Processor Interface Adapter. This redirects the module’s internal channels into easily accessible Phoenix terminal strips and RS-422/485 ports.
- Time Synchronization Configuration: Connect the IRIG-B time distribution lines (supporting B002 or B122 formats) directly to the corresponding adapter points to lock system logging data down to sub-millisecond precision.
- Programming & Environment: Logic building and diagnostics are executed exclusively via the TriLogik or Workbench IEC 61131-3 development packages over secure network structures.
Q&A – Frequently Asked Questions
Q: What exactly does the 3-2-0 fault tolerance designation mean for the T8111C?
A: If a hardware failure occurs within one processor region, the T8111C degrades to a stable “2-out-of-2” (3-2) voting structure while maintaining process uptime. If a second, separate failure strikes the remaining core pairs, the architecture defaults to a safe shutdown mode (0), isolating the loop entirely.
Q: Can a non-coated T8111 be mixed with a conformal-coated T8111C inside a redundant chassis?
A: Yes, they are completely identical from an execution, timing, and logic standpoint. However, in aggressive processing plants, utilizing mismatched coatings introduces vulnerabilities to chemical wear on the unprotected card.
Q: How are structural hardware clock deviations prevented across the three separate internal processors?
A: The Trusted system relies on a central, completely redundant hardware fault-tolerant clock array that feeds identical system clock signals to all containment regions simultaneously, ensuring tight lock-step timing.
Q: Where can I request formal commercial pricing or check on available logistics?
A: For certified new or thoroughly tested refurbished component stocks, warranty options, and custom logistics quotes, please consult our ICS Triplex T8111C Trusted Processor Procurement Portal.
Product Related News
In 2026, the ICS Triplex Trusted series continues to be widely supported by Rockwell Automation as a core solution for process safety installations requiring maximum uptime. Refineries and nuclear installations are extending the service lifecycles of their T8100 controller racks by strategically rolling out T8111C upgrades to legacy processing chains. Recent firmware improvements emphasize enhanced resilience against high-frequency electromagnetic interference (EMI) and sharper Sequence of Events (SOE) tracking metrics. This allows engineering groups to cross-examine complex, multi-point plant trips with precision, isolating field instrumentation errors from central control systems in seconds.
