Invensys 7400208B-020
Invensys 7400208B-020
Invensys 7400208B-020
Invensys 7400208B-020
Invensys 7400208B-020
Invensys 7400208B-020
Ask our team:
  • Phone: +86 181 0690 9650
  • E-Mail sales1@apterpower.com

7400208B-020

/ 4.9
1001 reviews | Need a Specific Revision?
7400208B-020 - A baseplate designed to securely mount and support digital input modules in industrial control systems.
In Stock
Ships by Thursday, October 29
Fast Shipping Available
Get a quick price for 7400208B-020
Quantity
*E-mail
Company
*Mobile
*Content
Upload (gif, jpg, jpeg, png, bmp, doc, docx, xls, xlsx, ppt, pdf, csv)

Technical specifications for 7400208B-020

  • Manufacturer:
    Invensys
  • Part Number:
    7400208B-020
  • Product Family:
    Triconex
  • Stock:
    2
  • Number of Channels:
    8 isolated digital input channels
  • Input Voltage:
    24V DC (range 15-30V)
  • Isolation Voltage:
    1500V RMS (channel to system)
  • Response Time:
    ≤ 2ms
  • Absolute maximum input voltage:
    33 VDC
  • Absolute maximum reverse input voltage:
    – 0.6 VDC
  • Weight:
    1.34 kg
  • Estimated shipping dimensions:
    24.8x17.8x8cm
  • 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 Applications Monitoring & Control Safety & Compliance

Features:

  • Triple Modular Redundancy (TMR) Architecture for Fault Tolerance
  • High-Voltage Isolation for Signal Integrity
  • High-Speed Detection for Emergency Response
The Invensys Triconex 7400208B-020 implements a fully triplicated I/O bus structure. This design allows the connected DI module to route the same field signal through three independent paths to the three main processors . If one path fails or provides corrupted data, the system automatically votes out the faulty channel, ensuring the Safety Instrumented Function (SIF) continues uninterrupted. This architecture is critical for maintaining SIL 3 ratings during real-world single-fault events.

Engineered with ≥1500V AC/DC galvanic isolation, the Invensys Triconex 7400208B-020 provides physical separation between the high-energy field wiring and the low-voltage logic side . This feature eliminates ground loop interference, protects the processor from lightning-induced surges, and prevents cross-channel short circuits. For plant engineers, this translates to fewer nuisance trips and higher resistance to electrical noise in heavy industrial environments like substations or heavy machinery zones.

With a typical response time of <10 ms, the Invensys Triconex 7400208B-020 ensures rapid detection of digital state changes from field devices such as emergency pushbuttons, pressure switches, and valve limit switches . This speed exceeds the typical requirements for process safety (which often allows 50-200ms), providing a significant design margin. It allows safety logic to execute shutdown actions fast enough to prevent mechanical damage or contain hazardous material releases before process limits are exceeded.

The 7400208B-020 Invensys Triconex Digital Input Backplane may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
Invensys Triconex 7400208B-020 Digital Input Backplane 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.
Invensys Triconex 7400208B-020 Digital Input Backplane

General

  • Manufacturer Invensys Triconex
  • Model 7400208B-020
  • Condition New Original ready stock
  • Product Family 7400209-010 AO2481,7400209-030 DO2401,7400210-010 AI2351
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): Mounts DI modules reading pressure transmitter switches, ensuring the logic solver receives high-pressure signals within milliseconds to initiate safe blowdown.
  • Fire & Gas (F&G) Systems: Provides isolated channels for flame detectors and manual call points in petrochemical facilities. High channel-to-channel isolation prevents nuisance alarms from water ingress or cable damage.
  • Burner Management Systems (BMS): Reads flame scanners, air flow switches, and valve limit switches. Sub-10ms response time cuts fuel supply instantly upon flame loss, preventing furnace explosions.
  • Oil & Gas Upstream: Supports wellhead control panels with emergency shutdown buttons and high-high level switches in Zone 2 hazardous areas, tolerating harsh temperature variations and vibration on drilling platforms.
  • Online I/O Bus Diagnostics: The backplane includes circuitry that monitors I/O bus health. If a bus trace fault develops, the main processor logs a "Chassis Fault" event while TMR architecture continues operation on the two remaining healthy buses.
  • Real-Time Status Bits: Each channel provides pass-through data without scan cycle delay. "Module Active" status per slot is available; hot-swapped module removal instantly reports "Module Not Present" to the HMI before field signals are lost.
  • Voting Monitoring (2oo3): The backplane distributes field signals to all three processors. Operators monitor "Disagreement" alarms (e.g., Processor A = ON, B/C = OFF), identifying failing field devices like sticky relays before they cause spurious trips.
  • SIL 3 (IEC 61508): Certified for Safety Instrumented Systems. Classified as a "Type A" simple subsystem with documented failure rates (λ) for PFDavg calculations per IEC 61511.
  • Hazardous Locations: Suitable for Class I, Division 2 (Zone 2). Meets ATEX and IECEx for gas groups IIA, IIB, and IIC when installed in a sealed Triconex chassis.
  • RoHS Compliant: Adheres to global environmental regulations on lead and mercury content—critical for European markets and sustainability protocols.
  • Proven-in-Use & Obsolescence: Benefits from extensive field history. For lifecycle planning, verify the date code against Schneider Electric's formal notification process to ensure latest revision standards.
Description
The 7400208B-020 Digital Input Backplane is an essential component of the Tricon safety instrumented system, primarily used in critical control applications within industrial environments. As an interconnection backplane within the Tricon TMR (Triple Modular Redundancy) architecture, it provides stable and reliable hardware support for digital input modules, ensuring high availability and consistency of signals under the triple-redundant structure.

In terms of performance, each digital input channel delivers a fast response time of ≤2 ms, meeting stringent industrial demands for real-time control and safety interlock actions. This ensures timely detection of status changes in field devices and supports rapid decision-making within the safety system.

Engineered for high-availability environments, the Invensys Triconex 7400208B-020 supports hot-swappable module replacement without system interruption. It features robust channel-to-channel isolation rated at ≥1500V AC/DC, protecting the logic solver from field-side surges and ground loops. The backplane achieves a rapid response time of <10ms, making it suitable for emergency shutdown (ESD) and fire & gas (F&G) applications requiring SIL 3 compliance per IEC 61508.
Alternative Names
7400208B020 7400208B 020 7400208C-020 7400208B-O2O 7400209-010 7400209-030 7400210-010 AI2351
Technical notes
The Invensys Triconex 7400208B-020 is specifically engineered for Digital Input (DI) modules (Type DI2301) and does not support analog or output modules without proper adapters. Installation requires verification of the TMR bus alignment—the backplane contains three separate I/O buses (375 kbps) that must align perfectly with the main processor chassis . Users should confirm field device voltage thresholds (typically 24V DC) match the backplane's input detection range of 15-30V DC (High/ON) and 0-5V DC (Low/OFF).
Exceptional Service

Our Mission

  • 100% Satisfaction

    We believe expertise is priceless. With over 20 years of experience, and top engineers on staff, we can help you solve or avoid problems that threaten your business.
  • Trust Guaranteed

    Not only do we have a vast inventory, our team makes sure every piece of equipment is in working condition. Your purchases are also backed by our Warranty.
  • Expertise

    Time is money, especially when your equipment is down. We work quickly to get your equipment on its way so you can get it back up and running.

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 is the Invensys Triconex 7400208B-020 consumption?
The input power consumption is 0.2 W per point at 24 VDC, and 0.5 W per point at 33 VDC.
How does the Invensys Triconex 7400208B-020 handle channel-to-channel crosstalk or short circuits?
The Invensys Triconex 7400208B-020 provides ≥1500V AC/DC galvanic isolation between every adjacent channel . This means if a field short circuit occurs on Channel 1 (e.g., a sensor cable is pinched and contacts 120V AC), Channel 2 will remain unaffected and continue to report accurate status to the logic solver. This isolation prevents a single field wiring fault from taking down multiple input points.
What is the communication protocol between the backplane and the main processor?
The Invensys Triconex 7400208B-020 does not use standard Ethernet or Modbus. It utilizes a proprietary triplicated I/O bus running at 375 kbps . This bus physically runs along the bottom of the backplane and consists of three separate, isolated channels—one dedicated to each leg of the TMR processor (A, B, and C). Diagnostic variables for the bus health are accessible via the Tricon system diagnostics.
Can the Invensys Triconex 7400208B-020 be integrated with third-party safety controllers or non-Triconex systems?
The Invensys Triconex 7400208B-020 is specifically designed for the Triconex Tricon chassis and power bus architecture. While the 24 VDC output could theoretically power third-party devices, its form factor, connector pinout, and diagnostic interface are proprietary to Triconex. For powering non-Triconex equipment, engineers should use the module's power output terminals only after verifying compatibility with the target device's input specifications.

Product Browsing History