Description
ICS Triplex T8403
Technical Specifications
- Input Channels: 40 digital input channels per module
- Architecture: Triple Modular Redundancy for each of the 40 input channels
- Input Voltage Range: 20 to 32 VDC backplane supply
- Maximum Power Dissipation: 29 Watts
- Isolation: 2500 V impulse withstand opto-galvanic isolation barrier
- Event Recording Resolution: 1 millisecond Sequence of Events resolution
- Timestamp Accuracy: Plus or minus 10 milliseconds
- Input Threshold Accuracy: 0.5 VDC safety accuracy
- Line Monitoring: Independently configurable per channel for open circuit and short circuit field wiring fault detection
- Dimensions: 266 millimeters by 31 millimeters by 303 millimeters
- Weight: 1.18 kilograms
Functional Features
- Each field input is triplicated and the input voltage is measured using a sigma-delta input circuit
- User-configurable threshold voltages on a per-channel basis for determining reported field input state
- Comprehensive fault detection and tolerance through triplicated voltage measurement coupled with onboard diagnostic testing
- Onboard Sequence of Events reporting with 1 millisecond resolution triggered by state changes
- Line monitoring functions detect open and short circuit field cables when line-monitoring devices are installed at field switches
- Automatic diagnostics and self-test routines running continuously
Application Scenarios
- Oil and gas safety instrumented systems
- Chemical processing emergency shutdown systems
- Power generation protection systems
- Nuclear reactor monitoring
- Fire and gas detection systems
- Turbine control and protection
Performance Parameters
- High-resolution event recording with 1 millisecond resolution
- Plus or minus 10 millisecond timestamp accuracy for event sequencing
- 0.5 VDC threshold accuracy ensuring reliable state detection
- Continuous operation maintained during single module failure through TMR architecture
Material Composition and Structure
- Industrial-grade aluminum and steel chassis construction
- Conformal coated circuit boards for environmental protection
- Heavy-duty terminal blocks for field wiring connections
- Integrated opto-isolation barriers
- Status LED indicators for channel and module health
Working Principle Each of the 40 input channels is processed through three independent paths within the module. The sigma-delta input circuits measure field voltage on each path, and the results are compared against user-configurable thresholds. A voting mechanism determines the final reported state. If one path disagrees with the other two, the module continues operating on the majority vote while flagging the discrepancy for maintenance. Line monitoring circuits inject test signals to detect wiring faults.
Installation Requirements
- Install in Trusted TMR chassis with proper slot alignment
- Connect 24 VDC field power within specified range
- Use shielded cables for field wiring to prevent electromagnetic interference
- Ensure proper grounding of chassis and cable shields
- Configure input thresholds per channel based on field device characteristics
Operating Precautions
- Verify field voltage remains within 20 to 32 VDC range
- Configure line monitoring only when compatible field devices are installed
- Monitor module health indicators regularly
- Replace modules showing persistent fault flags promptly
- Maintain backup of channel configuration parameters
