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Description
Product Overview
Product Name: Triple Modular Redundant (TMR) Digital Input Module
Model Number: TC305-01
Manufacturer: ICS Triplex (now part of Rockwell Automation)
System Compatibility: Trusted® TMR Safety Instrumented System (SIS)
Primary Function: High-integrity digital input acquisition for critical safety applications
The TC305-01 is a fault-tolerant, SIL 3-certified module designed for safety-critical systems in process industries. It reads discrete (on/off) signals from field devices (e.g., emergency stop buttons, pressure switches) using Triple Modular Redundant (TMR) architecture. Three independent channels process each input, with voting logic to ensure continued operation even if one channel fails.
Key Features
- TMR Architecture: Three independent input circuits per channel (3-2-1 voting)
- SIL 3 Certification: Meets IEC 61508/61511 standards for safety systems
- High Availability: >99.999% uptime with hot-swappable module replacement
- Diagnostics: Continuous self-testing for circuit faults, wire breaks, and channel discrepancies
- Flexible Inputs: Supports 24V DC/48V DC dry contact or active signals
- Galvanic Isolation: 1500V isolation between field inputs and logic circuits
- Live Maintenance: Modules replaceable without system shutdown
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Technical Specifications
| Parameter | Specification |
|---|---|
| Input Type | 16-channel digital (sink/source configurable) |
| Input Voltage Range | 24V DC (19–30V DC) or 48V DC (38–55V DC) |
| Input Current | 6 mA typical per channel (24V DC) |
| Response Time | < 10 ms (per channel) |
| Isolation | 1500V AC/DC (field-to-logic) |
| Voting Logic | 2-out-of-3 (2oo3) for fault tolerance |
| Operating Temperature | -40°C to +70°C (-40°F to +158°F) |
| Humidity | 5–95% RH (non-condensing) |
| Certifications | SIL 3 (TÜV), ATEX/IECEx Zone 2, CE, UL/cUL |
| Backplane Communication | Trusted® high-speed TMR bus (100 Mbps) |
| MTBF | > 100 years (per channel) |
System Integration
Hardware Structure
- Termination Unit (TU305): Required for field wiring interface (sold separately)
- TMR Bus: Synchronizes data across three redundant processor lanes
- Diagnostic LEDs: Per-channel status (OK/Fault/Bypass) on module front panel
Typical Applications
- Emergency Shutdown (ESD) Systems:
- Process valve status monitoring
- Fire/gas detection inputs
- Turbomachinery Protection:
- Overspeed trip inputs
- Lube oil pressure switches
- Nuclear/Hydrocarbon Processing:
- Safety interlock signals (e.g., high-level switches)
- Burner management system (BMS) inputs
- Offshore Platforms:
- Subsea valve position feedback
- HIPPS (High-Integrity Pressure Protection) inputs
Configuration & Diagnostics
- Software: Configured via Trusted ToolboxST(Rockwell)
- Voting Strategies: Configurable per channel (1oo1, 1oo2, 2oo3)
- Fault Reporting:
- Real-time alerts for stuck-at faults or channel mismatch
- Event logs with timestamped diagnostics
- Bypass Mode: Temporarily disable channels for maintenance
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