ICS T8451
Product Description
The ICS Triplex T8451 is a fault-tolerant digital output module belonging to the Trusted control system family, engineered for mission-critical and safety-instrumented system (SIS) deployments. It employs triple modular redundancy (TMR) with 2oo3 voting logic to ensure fail-safe operation, supporting de-energize-to-trip (DTT) and configurable energize-to-trip (ETT) for protective loops. With 40 independent output channels organized into 5 power groups (8 channels/group), it provides granular current limiting and isolation to prevent cascading faults. Key features include optional line monitoring for open/short detection, built-in diagnostics, and compatibility with Trusted backplanes for seamless integration into DCS/SCADA environments. It is ideal for valve actuation, breaker control, turbine protection, and other high-availability switching tasks in harsh industrial settings.
Key Parameters & Specifications
| Category | Specification | Notes (Critical Checks) |
|---|---|---|
| Manufacturer | ICS Triplex (Rockwell Automation) | Trusted™ series; not generic I/O |
| Model/Part No. | T8451 | Confirm suffix for variants (e.g., T8451C) |
| Product Type | TMR Digital Output Module (24 VDC) | Fully triplicated, fault-tolerant |
| Output Channels | 40 channels; 5 power groups (8 channels/group) | Granular current limiting per group |
| Output Voltage (Field) | Operational: 18–32 VDC; Withstand: -1–40 VDC | For 24 VDC field devices |
| Output Current | 2 A continuous per channel; 8 A max per power group | Derate for ambient temp/vibration |
| Minimum On-State Load | 50 mA | To ensure reliable switching |
| On/Off State Resistance | On: ~0.6 Ω; Off: ~33 Ω (typical) | Per relay/driver specs |
| System Supply Voltage | 20–32 VDC | For module electronics |
| Redundancy/Architecture | TMR (2oo3 voting); optional line monitoring | For SIL/critical safety loops |
| Key Features | Diagnostics, hot-swappable (per Trusted chassis), DTT/ETT configurable | Minimize downt |