The Rockwell T8451 is a high-density Triple Modular Redundant (TMR) digital output module designed for mission-critical safety systems. As part of Rockwell’s Trusted® safety controller family, this 40-channel module delivers SIL 3-certified performance with 24V DC switching capability for emergency shutdown (ESD) and fire & gas detection systems. The T8451 implements patented TMR architecture where three independent processors synchronously execute control logic, achieving 99.9999% system availability in continuous process industries.
Specifically engineered for ControlLogix® platforms, the Rockwell T8451 features galvanic isolation up to 1500V AC between field circuits and control electronics. Its dynamic voting mechanism automatically masks failed channels while maintaining process continuity in oil & gas pipeline SCADA systems. The module’s integrated health monitoring system provides real-time diagnostics for field wiring integrity and contact wear analysis.
Rockwell T8451 Three-mode redundant (TMR) digital output module
Key Features and Advantages:
The Rockwell T8451 revolutionizes safety-critical automation with its 3-2-1 voting architecture – three independent channels perform simultaneous calculations, with any two agreeing outputs determining the final state. This design eliminates single-point failures in nuclear power plant reactor protection systems.
Advanced diagnostics: Each channel provides <1mA leakage current detection and contact welding monitoring through patented Current Signature Analysis (CSA) technology. The module’s non-volatile memory stores 10,000+ event logs with 1ms resolution for forensic analysis after safety incidents.
Seamless integration: Pre-engineered Add-On Profiles (AOPs) for Studio 5000® Logix Designer reduce engineering time by 65%. The T8451’s hot-swappable design allows replacement without powering down critical processes in LNG liquefaction plants.
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | T8451 |
| Manufacturer | Rockwell Automation |
| Product Type | TMR Digital Output Module |
| Output Type | 24V DC sinking (40 channels) |
| Max Load Current | 2A per channel (resistive) |
| Isolation Voltage | 1500V AC (field to logic) |
| Response Time | <5ms (0-90% activation) |
| Communication Protocol | CIP Safety™ over EtherNet/IP |
| Power Consumption | 3.8W (typical at 24V DC) |
| Operating Temperature | -40°C to +70°C |
| Vibration Resistance | 5g @ 10-500Hz (IEC 60068-2-6) |
| Shock Immunity | 30g peak (11ms duration) |
| Certifications | SIL 3 (IEC 61508), ATEX/IECEx |
| Dimensions | 135 x 130 x 60 mm |
| Weight | 780g |
Related Products:
- ICS TRIPLEX T8110B Trusted TMR Processor
- ICS TRIPLEX T8310 Fault Tolerant Programmable Controller
- ICS TRIPLEX T8403 Fault Tolerant Programmable Controller
- Rockwell T9110 Fault Tolerant Programmable Controller
- T9451 Fault Tolerant Programmable Controller
- 5069-L4100ERMW Industrial controller Allen-Bradley / Rockwell Automation
- Allen-Bradley 81001-340-71-R PowerFlex 7000 medium voltage AC drive
Installation and Maintenance:
Installation preparation: Verify backplane compatibility with ControlLogix 1756 series chassis before mounting the Rockwell T8451. Use Rockwell-approved 14 AWG shielded cables (P/N 1585J-M12TBS-1) for field wiring to maintain EMC compliance.
Maintenance recommendations: Perform annual contact resistance measurement (must be <50mΩ per channel). The module’s front-panel LCD displays remaining contact life percentage based on cumulative switching cycles. Update firmware during planned shutdowns using FactoryTalk® AssetCentre.
There are no reviews yet.