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        T8903

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        T8903 is an ICS Triplex Trusted analog output module featuring 60 channels, 0-20mA/0-10V output, 12-bit resolution, and triple-redundant architecture for SIL 3 safety applications.
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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 T8903

        • Manufacturer:
          ICS Triplex
        • Part Number:
          T8903
        • Product Family:
          Trusted Triple Modular Redundant
        • Product Type:
          Analog Output Module
        • Number of Channels:
          60 (fused)
        • Output Voltage:
          0-10 VDC
        • Output Current:
          0-20 mA per channel
        • Resolution:
          12 bits
        • Signal Linearity:
          0.1%
        • Isolation Voltage:
          1000 VDC
        • Response Time:
          < 3 ms
        • Power Consumption:
          15 W
        • Input Voltage:
          24 VDC
        • Operating Temperature:
          -20°C to +70°C
        • Storage Humidity:
          5% to 95% RH (non-condensing)
        • Estimated shipping dimensions:
          36×6.8×11cm
        • Tariff Code:
          8517795000
        • 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 Diagnostics & Protection Installation & Upgrade

        Features:

        • Provides 60 fused channels supporting 0-20mA or 0-10V, exceptional for large-scale safety systems
        • Certified for SIL 3 applications with TMR architecture ensuring fault tolerance
        • <3ms response time, 1000V isolation, and 400,000-hour MTBF for demanding industrial control
        The T8903 delivers an exceptional 60 analog output channels in a single module, providing one of the highest channel densities available in the Trusted I/O family . Each channel is individually fused, protecting both the module and field devices from overcurrent conditions. The outputs are software-configurable for either 0-20 mA current loops (ideal for driving I/P converters and valve positioners) or 0-10 VDC voltage signals (suitable for simpler actuators and indicators).

        The T8903 is certified for Safety Integrity Level 3 (SIL 3) applications per IEC 61508/61511, the highest rating for single-module safety compliance . This certification is achieved through the module's inherent triple-redundant design, where three independent analog output circuits operate in parallel and vote on the correct output value . A single component failure within any of the three channels will not cause an erroneous or lost output signal—the remaining two channels continue to provide correct control. This "2oo3" (two-out-of-three) voting architecture is fundamental to the Trusted platform's fault-tolerant philosophy, ensuring that safety-critical loops remain operational under single-fault conditions.

        The T8903 achieves a response time of less than 3 milliseconds from digital command to analog output, enabling rapid closed-loop control for fast-acting processes . This speed is critical for applications such as anti-surge control on compressors or fast emergency shutdown sequences where milliseconds matter. The module provides 1000 VDC isolation between channels and the system backplane, preventing ground loops, common-mode voltages, and field-side transients from affecting controller operation .

        The T8903 ICS TRIPLEX Analog Output Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).

        ICS TRIPLEX T8903 Analog Output 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 T8903 Analog Output Module Specs

        General

        • Manufacturer ICS TRIPLEX
        • Model T8903
        • Condition New Original ready stock
        • Product Family T8902,T8901,T9193,T9191
        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 (ESD): Safely commands control or isolation valves to isolate processes during an emergency.
        • Fire and Gas (F&G) Systems: Drives continuous signals to visual/audible alarms and high-capacity deluge valves.
        • Burner Management Systems (BMS): Manages precise air-to-fuel ratios by controlling fuel regulating valves in heavy industrial boilers.
        • Triple Modular Redundancy (TMR): Features three independent internal channels utilizing a "2-out-of-3" voting system. If one channel fails, it is isolated while the remaining two maintain uninterrupted, accurate output.
        • Line Monitoring: Constantly scans for open-circuit (broken cables) and short-circuit conditions on field wiring, automatically limiting loop current during shorts to prevent internal hardware damage.
        • Output Read-Back Verification: The module continuously measures the actual field current and compares it with the controller's intended value. Any mismatch triggers an immediate safety alarm.
        • Online Hot-Swapping: Supports fully live replacements. When a module indicates a hardware fault (Red LED), maintenance teams can swap it out without powering down or halting production. The new module automatically re-synchronizes configuration data.
        • Companion Slot Configuration: The Trusted chassis allows pre-installing a backup module in an adjacent slot. The system can execute a microsecond-level switchover to the backup if the primary module encounters an error.
        • Lifecycle & Migration: Since the ICS Triplex Trusted legacy series is now in its Active Mature or Discontinued lifecycle stage, new systems are no longer deployed with this model.
        Description
        The T8903 is a high-density analog output module from ICS Triplex's Trusted TMR (Triple Modular Redundant) system, designed for safety-critical control applications . While modules like the HS810 handle high-speed fiber optic communication, the T8903 focuses on delivering precise analog signals to field devices such as control valves and actuators. 

        The T8903 features 60 fused output channels supporting 0-20 mA current loops or 0-10 VDC voltage signals, providing exceptional flexibility for diverse field devices . Each channel on the T8903 includes individual fuses for protection against overcurrent conditions. 

        Electrical specifications for the T8903 include 0-10 VDC output voltage, 0-20 mA per channel current capability, and 15 W power consumption . The T8903 offers 1000 VDC isolation voltage, preventing ground loops and field faults from propagating to the controller. Response time is less than 3 ms, enabling fast loop control . With an MTBF of 400,000 hours, the T8903 is built for long-term reliability.

        The T8903 shares the same triple-redundant design philosophy as other Trusted I/O modules, ensuring that a single channel failure does not compromise system operation . When comparing communication-focused modules like the HS810 to output modules like the T8903, each serves distinct but complementary roles in a complete safety instrumented system. 
        Alternative Names
        T89O3 T9030 T9087 T9191 T9193 T8901 T8902 T8891C
        Technical notes
        The T8903 is a 60-channel analog output module for ICS Triplex Trusted systems. Features 0-20mA/0-10V outputs, 12-bit resolution, 1000V isolation, <3ms response, and 400,000-hour MTBF . Operates -20°C to +70°C, consumes 15W. SIL 3 certified. Requires Trusted 10 FTA for field termination.
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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
        How many analog output channels does the T8903 provide?
        The T8903 provides 60 fused analog output channels, each supporting 0-20 mA current loops or 0-10 VDC voltage signals, making it one of the highest-density analog output modules in the Trusted family.
        Is the T8903 certified for safety-critical applications?
        Yes, the T8903 is designed for SIL 3 (Safety Integrity Level 3) applications per IEC 61508/61511 standards, making it suitable for emergency shutdown (ESD), fire and gas (F&G), and burner management systems (BMS).
        What is the isolation rating of the T8903?
        The T8903 provides 1000 VDC isolation between channels and the system backplane, preventing electrical faults in field wiring from damaging the controller or affecting other channels.
        What is the typical response time of the T8903?
        The T8903 has a response time of less than 3 milliseconds, enabling fast closed-loop control for applications requiring rapid analog output adjustments.

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