Description

The ICS Triplex T8403C is a high-integrity digital input module designed for the Trusted Triple Modular Redundant (TMR) safety control platform. It provides 40 independent 24 VDC digital input channels for interfacing with field devices such as switches, transmitters, and contactors in mission-critical industrial applications.

Each input channel is triplicated across three independent processing lanes. This TMR architecture ensures continuous operation even if one or two channels experience faults. The module uses sigma-delta analog-to-digital converters to measure incoming voltages with high precision, enabling accurate state determination based on user-defined thresholds.

The T8403C supports line monitoring when used with compatible field wiring and switches. It can detect open circuits, short circuits, and degraded signal conditions—enhancing diagnostic coverage and reducing unplanned downtime. Additionally, the module features Sequence of Events (SOE) logging with 1 ms time-stamping resolution, which captures input transitions for forensic analysis and compliance reporting.

Typical applications include emergency shutdown systems, burner management, and turbine protection in oil & gas, power generation, and chemical processing facilities. The module complies with IEC 61508 up to SIL 3, reflecting its suitability for the most demanding functional safety environments.

Key technical specifications:

• Model Number: T8403C
• Manufacturer: ICS Triplex (Rockwell Automation)
• System Family: Trusted TMR
• Input Type: 24 VDC digital (sinking or sourcing, depending on system configuration)
• Number of Channels: 40
• Redundancy: Triple modular redundancy (TMR) per channel
• Voltage Measurement: Sigma-delta ADC with configurable thresholds
• Diagnostics: Open/short circuit detection, SOE with 1 ms resolution
• Functional Safety: Certified to IEC 61508 SIL 3
• Dimensions: 30 mm × 302 mm × 265 mm (W × H × D)
• Weight: 1.26 kg
• Country of Origin: USA
• Status: Active product (not discontinued)
• MOQ: 1 unit
• HS Code: 8537101190