Description
The ICS Triplex T8161B is a high-performance, Triple Modular Redundant (TMR) processor module designed for the Trusted™ safety system. It serves as the primary intelligence unit, executing safety-critical logic for Emergency Shutdown (ESD), Fire and Gas (F&G) detection, and Critical Control applications.
Product Introduction
The T8161B Trusted TMR Processor is the heart of a fault-tolerant architecture. The “Trusted” platform is renowned for its “Safety-on-Every-Level” design, where three independent processing slices operate in parallel to perform 2-out-of-3 (2oo3) voting. This ensures that a single hardware failure within the processor does not compromise the safety function or cause an unnecessary process trip.
The module is responsible for scanning input data from the Trusted I/O modules via the Inter-Module Bus (IMB), executing the user-defined application program, and updating outputs. The T8161B variant features enhanced processing speed and memory capacity compared to earlier versions, supporting complex safety algorithms with high-speed deterministic execution.
Product Parameters (Datasheet)
The following specifications detail the hardware and operational characteristics of the T8161B:
| Parameter | Specification |
| Model Number | T8161B |
| System Platform | Trusted™ TMR System |
| Architecture | Triple Modular Redundant (TMR) |
| Processing Power | High-speed 32-bit RISC Processors (3 per module) |
| Memory (RAM) | 32 MB Error-Correcting Code (ECC) Memory |
| Flash Memory | 8 MB for Application Logic and Operating System |
| Scan Time | Typically < 10ms (Logic dependent) |
| Safety Integrity Level | Certified for SIL 3 (IEC 61508) |
| Communications | 2 x RS-422/485 Serial, 10/100 Mbps Ethernet (Peer-to-Peer) |
| Power Consumption | Approx. 35 Watts |
| Operating Voltage | 20V to 32V DC (Internal Bus Power) |
| Redundancy | Support for Hot-Standby Processor Pairs |
| Operating Temp | -5°C to +60°C |
Country of Origin
- Origin: United Kingdom (UK)
The ICS Triplex brand, now owned by Rockwell Automation, maintains its engineering and manufacturing centers for the Trusted product line in the United Kingdom.
Technical Description & Key Features
The T8161B is distinguished by its sophisticated internal error-handling and voting mechanisms:
- Hardware Voting: The TMR architecture utilizes a hardware-based voter to compare data between the three processing slices. If one slice disagrees, it is automatically flagged, and the system continues to operate using the remaining two slices.
- Comprehensive Self-Tests: The processor performs background diagnostics on its memory, internal buses, and A/D converters to ensure that no “latent” faults exist that could impair the safety function.
- Hot-Swapping: The T8161B can be removed or inserted into a live system (subject to safety procedures). When a new processor is inserted, it automatically synchronizes its memory with the active system.
- Sequence of Events (SOE): The module supports high-resolution SOE recording, allowing for 1ms precision time-stamping of alarms and events, which is critical for post-incident analysis in complex industrial accidents.
ICS TRIPLEX T8161B
Product Usage Instructions
1. Installation
The T8161B is designed to be installed in the dedicated Processor Slots of the Trusted Controller Chassis (T8100).
- Ensure the grounding straps on the chassis are properly connected.
- Align the module with the guide rails and push until the ejector levers click into place.
- Tighten the front-panel captive screws to ensure a permanent ground connection.
2. Software Configuration
- The processor is programmed using the Trusted Toolset software (based on IEC 61131-3 languages).
- Download the application program via the Ethernet communications interface or through the front-panel diagnostic port.
- Verify the system “Healthy” status on the front-panel LEDs before putting the system into “Run” mode.
3. Maintenance
- Periodically check the diagnostic logs via the engineering workstation to identify any “Soft Faults” that may have occurred in one of the slices.
- Ensure the cooling fans at the bottom of the chassis are free of dust to prevent the processor from thermal throttling.
Recommended Related ICS Triplex Models
- ICS Triplex T8403: 24V DC Digital Input Module (40 channels, TMR).
- ICS Triplex T8431: 24V DC Digital Output Module (TMR).
- ICS Triplex T8451: 4-20mA Analog Input Module (TMR).
- ICS Triplex T8110B: Trusted Communications Interface (TCI) for external networking.
- ICS Triplex T8151B: Trusted Power Management Unit.
