ICS Triplex T8403
ICS Triplex T8403
ICS Triplex T8403
ICS Triplex T8403
ICS Triplex T8403
ICS Triplex T8403
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T8403

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The ICS Triplex T8403 is a 40-channel TMR 24 Vdc Digital Input Module designed for high-reliability systems, delivering precise field input monitoring with IEC 61508 SIL 3 compliance.
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Technical specifications for T8403

  • Manufacturer:
    ICS Triplex
  • Part Number:
    T8403
  • Product Family:
    Trusted Triple Modular Redundant
  • Product Type:
    Digital Input Module
  • Stock:
    3
  • Number of Channels:
    40 independent input channels
  • Redundancy Architecture:
    TMR (Triple Module Redundancy), with triple voting logic
  • Safety Level:
    Compliant with IEC 61508 SIL 3 standard
  • Sequence Event Recording (SOE):
    1 ms resolution
  • Nominal Input Voltage:
    24 Vdc
  • Input Voltage Range:
    15 Vdc to 32 Vdc
  • Input Current (ON):
    Typical 3 mA (@ 24 Vdc)
  • Open Circuit Threshold (OFF):
    < 5 Vdc / < 0.5 mA
  • Typical Power Consumption:
    13.5 W
  • Channel Isolation:
    50 V continuous isolation (channel to ground)
  • Operating Temperature:
    0°C to 60°C (32°F to 140°F)
  • Storage Temperature:
    -25°C to 70°C (-13°F to 158°F)
  • Relative Humidity:
    5% Up to 95% (non-condensing)
  • Applicable backplate:
    Trusted T8100 frame
  • Weight:
    1.2 kg
  • Estimated shipping dimensions:
    3x30.2x26.4cm
  • Tariff Code:
    8537101190
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen, Fujian, China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Specifications Firmware Configuration Application Scenarios

Features:

  • Interfaces Reliably With 40 Independent Field Input Devices Using TMR Architecture.
  • Provides Real-Time Sequence Of Events Logging With Millisecond Resolution.
  • Enables Continuous Online Operation With Hot-Swappable Installation Capability.
The ICS Triplex T8403 Digital Input Module is designed to handle high-integrity digital inputs in mission-critical control systems. Each input channel measures field voltages through a sigma-delta circuit and evaluates them against configurable thresholds, ensuring precise detection of ON and OFF states. The module supports line-monitoring functionality, allowing operators to identify open or short-circuited field wiring independently for each channel.

Built for demanding industrial environments, the T8403 operates across a temperature range of 0°C to 60°C (32°F to 140°F) and can be stored between -25°C and 70°C (-13°F to 158°F), while tolerating relative humidity from 5% to 95% non-condensing. Its 50 V continuous channel-to-ground isolation and IP20 protection provide robust electrical and mechanical durability, making it suitable for Trusted® T8100 frame installations.

Operators benefit from integrated diagnostics, front-panel LEDs, and comprehensive self-tests, which provide immediate feedback on module and channel health. The onboard Sequence of Events (SOE) recording captures precise input state changes at 1 ms resolution, supporting real-time monitoring, troubleshooting, and logging. Hot-swappable design allows module replacement without system shutdown, maintaining uninterrupted operation of the TMR control architecture.

The T8403 ICS Triplex Digital Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
ICS Triplex T8403 Digital Input Module Manuals,Datasheets,Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
ICS Triplex T8403 Digital Input Module Specs

General

  • Manufacturer ICS Triplex
  • Model T8403
  • Condition New Original ready stock
  • Product Family T8423,T8425,T8402
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Version Compatibility: The firmware must match the operating system (OS) version of the Trusted controller, typically distributed via Trusted Toolset.
  • Triple Voting Logic: The firmware incorporates a TMR (Triple Module Redundancy) voting algorithm, performing real-time comparisons of data from three independent processing paths within the module.
  • Online Upgrade: Supports firmware updates during system operation, but requires a Fault Tolerant Pair configuration to ensure uninterrupted processing.
  • Diagnostic Reports: The firmware monitors hardware health in real time and reports detailed channel-level faults (such as open circuits, short circuits, and abnormal transitions) to the controller.
  • Software Environment: Channel definitions, threshold settings, and logical associations are performed using Trusted Toolset software.
  • SOE Enablement: A 1ms Sequence Event Recording (SOE) function can be independently enabled for each channel in the configuration for post-fault analysis.
  • Line Monitoring: The load characteristics of the input circuit can be configured to detect open or short circuits in the wiring between field devices and the module.
  • Filtering and Debouncing: Supports setting digital filtering time in the software to prevent frequent fluctuations or false alarms in input signals caused by on-site electrical noise.
  • Emergency Shutdown System (ESD): Serves as a core safety input for oil and gas facilities, receiving critical shut-off signals from manual buttons, pressure switches, etc.
  • Flame and Gas Monitoring System (F&G): Connects to flame detectors, smoke alarms, and gas detectors, providing high-reliability monitoring compliant with SIL 3 standards.
  • Burner Management System (BMS): Monitors the flame status of boilers or furnaces, valve limit switches, and other critical interlocking inputs.
  • Critical Process Control: Used in fault-tolerant protection components in chemical reactors or nuclear facilities where the reliability of input signals is extremely important.
Description
The ICS Triplex T8403 Digital Input Module provides 40 independent input channels with Triple Module Redundancy (TMR) architecture, ensuring fault tolerance and continuous operation. Each input is measured using a sigma-delta circuit, and the triplicated signals are processed through onboard voting logic to maintain accurate field status even in the presence of single-point failures. The module accepts a nominal input voltage of 24 Vdc, with a range of 15–32 Vdc, and each channel typically draws 3 mA when active.

Engineered for industrial reliability, the T8403 operates from 0°C to 60°C (32°F to 140°F) and can be stored between -25°C and 70°C (-13°F to 158°F), with relative humidity from 5% to 95% non-condensing. Channel-to-ground isolation is rated at 50 V continuous, while the module itself features IP20 protection, making it suitable for trusted T8100 frame installations in critical process environments.

The module provides high-resolution Sequence of Events (SOE) reporting at 1 ms, capturing changes in input states with precise timestamps. Voltage thresholds for "ON" (>15 Vdc / >1.8 mA) and "OFF" (<5 Vdc / <0.5 mA) states can be configured per channel, enabling accurate detection of open or short circuit field wiring when line-monitoring devices are used. Typical power consumption is 13.5 W, balancing performance with efficiency.

Compared to similar digital input modules such as the T8410 32-channel TMR module, the T8403 offers higher channel density and more granular SOE resolution. Its configurable voltage thresholds, coupled with comprehensive onboard diagnostics and front panel LEDs for both input and module status, provide operators with instant feedback on field conditions and module health.

Hot-swappable capabilities allow the T8403 to be replaced online using a dedicated Companion or SmartSlot configuration, minimizing downtime and supporting continuous system availability. Its TMR architecture, coupled with IEC 61508 SIL 3 certification, ensures the module delivers reliable, deterministic operation for mission-critical industrial applications.
Alternative Names
T8403C T8431 T8424 T8402C T8402 T8423 T8425 T84O3
Technical notes
The ICS Triplex T8403 Digital Input Module integrates advanced Triple Modular Redundancy (TMR) architecture with a standard 24 Vdc rated input, providing high-integrity fault tolerance and absolute reliable diagnostics for safety-critical loops.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
What safety capability does ICS Triplex T8403 provide?
ICS Triplex T8403 is designed for safety-critical applications and complies with IEC 61508 SIL 3 requirements. The module also uses Triple Module Redundancy (TMR) with triple voting logic to enhance fault tolerance and system availability.
Why choose ICS Triplex T8403 for critical digital input applications?
High reliability is achieved through 40 independent input channels, TMR architecture, and 1 ms Sequence of Events (SOE) recording, making ICS Triplex T8403 well suited for demanding industrial safety systems.
How does ICS Triplex T8403 detect digital input signals?
The module accepts a nominal input voltage of 24 Vdc with an operating range from 15 Vdc to 32 Vdc. Each input typically draws 3 mA at 24 Vdc, while the OFF threshold is below 5 Vdc or 0.5 mA.
Can ICS Triplex T8403 support accurate event recording?
Yes. ICS Triplex T8403 features integrated Sequence of Events (SOE) recording with 1 ms resolution, allowing precise monitoring of input signal changes.

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