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        T8403C

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        The ICS Triplex T8403C is a Trusted TMR (Triple Modular Redundant) 24Vdc Digital Input Module designed for high-reliability, safety-critical applications in industrial control systems.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
        Shipping Mode
        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for T8403C

        • Manufacturer:
          ICS Triplex
        • Part Number:
          T8403C
        • Product Family:
          Trusted Triple Modular Redundant
        • Product Type:
          Digital Input Module
        • Stock:
          3
        • Voltage Range:
          24V DC (Nominal)
        • Number of Input Channels:
          40 isolated digital inputs
        • Input Signal Isolation:
          Galvanic isolation per channel
        • Fault Tolerance:
          Triple Modular Redundancy (TMR) design
        • Safety Integrity Level (SIL):
          Certified for SIL3 applications according to IEC 61508
        • Input Type:
          Digital inputs, suitable for 24V DC signals
        • Diagnostics:
          Extensive diagnostics for detecting faults such as open circuits, short circuits, and stuck signals
        • Operating Temperature:
          -5°C to +60°C (23°F to 140°F)
        • Weight:
          1.18 kg
        • Estimated shipping dimensions:
          3x30.3x26.5cm
        • 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 Application Update Metho Configuration & Programming

        Features:

        • The T8403C is a Trusted TMR 24 Vdc Digital Input Module with 40 channels, designed for high-availability safety applications requiring triple modular redundancy.
        • No physical configuration is required on the module itself; all configuration is performed using the IEC 61131 TOOLSET and System Configuration Manager software tools.
        • Customizable operating characteristics include LED indicator modes, per-channel threshold levels, noise filtering, and discrepancy detection via the System Configuration Manager.
        The T8403C is a 40-channel 24 Vdc Digital Input Module built on Trusted Triple Modular Redundant (TMR) architecture, designed for safety-critical applications where continuous operation is essential. The TMR design ensures that no single point of failure can compromise system integrity, as the module operates with three independent processing paths that vote on input states to guarantee accurate and reliable data. This makes the T8403C ideal for safety instrumented systems (SIS) in industries such as oil and gas, power generation, and chemical processing.

        The T8403C requires no physical configuration on the module itself; all setup is performed through software tools on the Engineering Workstation (EWS). Using the IEC 61131 TOOLSET, engineers define I/O variables, create module definitions specifying chassis and slot locations, and connect variables to input channels. The Trusted System Configuration Manager then allows customization of LED indicator modes, per-channel threshold levels, and noise filtering. The TMR Processor automatically configures the module after applications are downloaded, streamlining deployment and reducing installation complexity.

        The T8403C offers extensive customization through the System Configuration Manager, enabling users to tailor module behavior to specific application requirements. Module-level configurable items include overall operating characteristics, while channel-level items allow per-channel threshold settings and noise filtering to accommodate diverse field input conditions. Discrepancy detection features help identify inconsistent input states across the TMR voting channels, enhancing diagnostic capabilities. These customizable features, combined with default settings that support most applications, provide flexibility without sacrificing ease of use.

        The T8403C 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 T8403C Digital Input Module Manuals, Datasheets, Drivers, 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 T8403C Digital Input Module Specs

        General

        • Manufacturer ICS Triplex
        • Model T8403C
        • Condition New Original ready stock
        • Product Family T8402,T8402,T8401,T8431,T8431C
        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.
        • Emergency Shutdown Systems (ESD): In oil, gas, or chemical plants, these systems execute safety shutdowns when dangerous pressures or levels are detected.
        • Fire and Gas Monitoring (F&G): These systems connect to fire detectors or gas sensors to trigger alarms or fire suppression procedures.
        • Burn Management Systems (BMS): These systems monitor the flame status and valve positions of boilers or heating furnaces.
        • Updates typically require the use of Rockwell Automation/ICS Triplex dedicated maintenance tools (such as Trusted Toolset).
        • Hot-Swap Online Replacement: Modules support hot-swapping. When a new module is inserted, the system automatically "educates" it to the current system configuration and firmware state.
        • Version Check: The firmware loading status can be determined via the Educated/Active/Standby LEDs on the module's front panel.
        • Development Environment: Logic programming and hardware configuration are performed using the Trusted Toolset (or ISaGRAF-based tools) compliant with IEC 61131-3.
        • Channel Thresholds: The voltage triggers for each channel can be configured independently (e.g., set to 8V or 12V) to accommodate different field-end switching devices.
        • Session of Events (SOE): Configurable SOE functionality for each channel, providing timestamps with up to 1 ms resolution for post-accident tracking and analysis.
        Description
        The ICS Triplex T8403C is a Trusted® TMR 24 Vdc Digital Input Module used to interface with 40 field input devices. Each input channel employs a Triple Modular Redundant (TMR) architecture, where field signals are triplicated and processed independently to provide high fault tolerance and continuous operation in critical applications. The module is certified to IEC 61508 SIL 3 requirements and supports systems requiring a high level of safety and availability.

        To determine the input state, the T8403C measures field voltage through sigma-delta input circuits and compares the measured values with user-configurable threshold voltages. Channel thresholds can be individually configured, allowing the module to adapt to different application requirements. A triplicated voltage measurement process, together with extensive onboard diagnostics, delivers comprehensive fault detection and fault tolerance capabilities.

        When line-monitoring devices are installed at the field switches, the T8403C can identify open circuits and short circuits in field wiring. Line-monitoring functions are configured independently for each channel, enabling flexible fault supervision. Additional diagnostic functions automatically detect abnormal conditions such as wiring faults and signal problems, while a 2500 V impulse withstand opto/galvanic isolation barrier provides electrical isolation between field signals and the control system.

        The T8403C includes onboard Sequence of Events (SOE) reporting with a resolution of 1 ms. Any change of state generates an SOE entry, allowing accurate event recording and analysis. Front-panel LEDs indicate individual channel status, field wiring faults, module health, and operating modes including Active, Standby, and Educated states. The T8403C also supports online hot replacement through dedicated Companion Slot or SmartSlot configurations, allowing maintenance activities to be carried out without interrupting system operation.
        Alternative Names
        T84O3C TB4O3C T8403 T8431C T8442C T8448C T8451C T8461C
        Technical notes
        ICS Triplex T8403C Trusted TMR Digital Input Module provides 40 channels of triple modular redundant, SIL 3-certified safety monitoring for critical industrial processes.
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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.
        VIEW ALL FAQS
        What is the T8403C module used for?
        The T8403C is a trusted Triple Modular Redundant (TMR) digital input module used in safety-critical industrial automation systems. It acquires digital signals from field devices such as switches, sensors, and relay contacts, and provides highly reliable, fault-tolerant input data for controllers in systems like power generation, oil & gas, and nuclear control. Its SOE (Sequence of Events) logging capability enables precise monitoring of input signal changes in real time.
        How many input channels does the T8403C support, and what is the input voltage?
        The T8403C supports 40 independent digital input channels, each operating at a nominal 24 V DC. The module features configurable line monitoring to detect open-circuit and short-circuit conditions per channel, ensuring high reliability and safety for mission-critical applications. The inputs are processed via TMR architecture for fault tolerance.
        Can the T8403C be replaced without shutting down the system?
        Yes. The T8403C is designed with hot-swap capability, allowing it to be replaced online in compatible ICS Triplex systems without powering down the control system. This ensures minimal downtime and continuous operation in industrial environments where system availability is critical.

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