Description
ICS Triplex T8451 Trusted TMR 24 VDC Digital Output Module
Product Overview
T8451 is a hot‑swappable triple‑modular‑redundant (TMR) digital output module for the ICS Triplex Trusted safety instrumented system (SIS)NEX Instru…. It delivers high‑integrity 24 VDC discrete outputs for safety‑critical plant protection, adopting 3‑2‑0 fault‑tolerant voting architecture. It drives field actuators, solenoid valves and motor circuits within ESD, F&G and BMS systems, and supports online module replacement without process shutdown for maximum plant availability.
T8451
Key Specifications
| Item | Parameter |
|---|---|
| Part Number | T8451 |
| Product Type | TMR Digital Output Module |
| System Platform | ICS Triplex Trusted SIS System |
| Total Channels | 40 digital output channels, grouped into 8 independent power groups (5 channels per group) |
| System Supply Voltage | 20‑32 VDC |
| Field Operating Voltage | 18‑32 VDC (nominal 24 VDC) |
| Continuous Channel Current | 2 A per channel; 8 A maximum per power group |
| Minimum On‑state Load Current | 50 mA |
| Max Withstand Voltage | ‑1 V ~ +40 VDC |
| Protection | Electronic latching short‑circuit protection, no fuse required |
| SOE Event Resolution | 1 ms sequence‑of‑events timestampingNEX Instru… |
| Certification | TÜV SIL 3 (IEC 61508), CE, ATEX, IECEx |
| Operating Temperature | ‑5 °C ~ +60 °C |
| Humidity | 5‑95 % RH, non‑condensing |
| Hot‑swap Support | Yes, SmartSlot / companion slot supported |
| Weight | 1.13 kg |
| Dimensions | 300 mm × 30 mm × 241 mm |
| Mounting | Rack‑mount inside Trusted chassis |
Main Applications
- Emergency Shutdown System (ESD) for oil & gas, petrochemical plants
- Fire and Gas (F&G) safety mitigation systems
- Burner Management System (BMS) for furnace and boiler protection
- HIPPS high‑integrity pressure protection systems
- Safety interlock control for power, cement and mining heavy‑process units
- Spare‑part replacement and retrofit for existing Trusted platform installations
Related Series Models
- T8451 40‑Channel 24 VDC TMR Digital Output Module (standard)
- T8451C Conformal‑coated variant for corrosive / high‑humidity environments
- T8403 Trusted Digital Input Module
- T8424 Analog Input Safety Module
- T8110B Trusted TMR Processor Module
T8451
Core Features
- Triple Modular Redundancy (TMR): Three independent internal slices execute voting logic; single‑fault tolerance maintains safe output without dropping control.
- Comprehensive channel diagnostics: Detects field‑wiring open‑circuit, short‑circuit and load failure; reports fault status to Trusted processor.
- Hot‑swap capability: Modules can be replaced online while the system runs; no full‑system shutdown required for maintenance.
- SOE timestamping: Built‑in 1 ms resolution sequence‑of‑events function for post‑incident root‑cause analysis.
- Group‑wise independent power supply: 8 separated power groups reduce cross‑group fault propagation risk.
- SIL 3 safety compliance: Meets IEC 61508 functional‑safety requirements for high‑risk industrial safety loops.
- Front‑panel LED indicators: Per‑channel status and module health LEDs for fast on‑site troubleshooting.
Main Functions
- Receive safety logic commands from Trusted TMR processor, perform internal hardware voting and drive 24 VDC field output signals to solenoids, valves and motor contactors.
- Continuously monitor output channel status, detect wiring faults and load anomalies, and send diagnostic alarms to the main controller.
- Record sequence‑of‑events timestamp data for safety‑related output state changes.
- Provide electronic short‑circuit protection for each channel to prevent damage to module and field devices.
- Support hot‑swap online replacement, synchronize with standby module in SmartSlot for seamless switch‑over.
- Execute fail‑safe de‑energized state upon critical module fault to satisfy safety‑loop requirements.
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