Description
- Manufacturer: ICS Triplex (Rockwell Automation)
- Model Number: T8151C
- Module Type: TMR (Triple Modular Redundant) Digital Output
- Voltage Rating: 24V DC
- Channel Density: 32 isolated output channels
- Safety Rating: Up to SIL 3 (IEC 61508)
- Redundancy: Triple modular architecture with internal 2-out-of-3 voting
- Diagnostic Coverage: Comprehensive line monitoring and load testing
The ICS Triplex T8151C is a high-integrity 24V DC digital output module designed for use within the Trusted™ TMR safety system, providing maximum availability and fault tolerance for critical control loops. Utilizing a Triple Modular Redundant (TMR) architecture, the module processes output commands through three independent sub-paths and performs an internal hardware vote to ensure that a single component failure cannot cause a false trip or a failure to command. This module is specifically engineered for emergency shutdown (ESD) and fire and gas (F&G) systems, where it provides continuous monitoring of the field wiring for open and short circuits even when the output is in the “off” state.
Model Comparison and Distinctions
The T8151C is distinguished from the standard T8151B by its enhanced “C” revision hardware, which incorporates updated power management components and improved transient protection for inductive loads. Unlike non-redundant digital output modules, the T8151C features a unique 2-out-of-3 (2oo3) voting structure at the hardware level, ensuring that if one internal slice fails, the process continues without interruption—a capability not found in simplex or dual-redundant systems. Furthermore, this module includes specialized high-current driving capabilities and field-side diagnostic transparency that exceeds the resolution of the earlier T8150 series, making it the preferred choice for modern Trusted™ system expansions requiring high-density SIL 3 compliance.
