ABB TB711FC1
ABB TB711FC1
ABB TB711FC1
ABB TB711FC1
ABB TB711FC1

ABB TB711FC1 | Bailey INFI 90 Termination Board

  • Brand:​ ABB (formerly Bailey Controls)
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    Model:​ TB711FC1
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    Product Type:​ Termination Board / I/O Interface Unit
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    Series:​ INFI 90 (FC I/O)
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    Core Function:​ Provides the physical interface between field wiring and INFI 90 FC I/O modules, offering signal conditioning and connection points.
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    Key Specs:​ Field termination, signal conditioning, I/O module interface.
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Manufacturer:
Part number: ABB TB711FC1
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Description

TB711FC1: Product Overview
The TB711FC1 is a termination board designed for ABB’s (formerly Bailey Controls) INFI 90 distributed control system, specifically for use with FC series I/O modules. This unit serves as the critical interface between field devices and the control system’s I/O modules, providing the physical termination points for field wiring while offering necessary signal conditioning and isolation. Mounted in an INFI 90 cabinet, the termination board connects directly to the corresponding FC I/O module and provides screw terminals or other connection methods for field device wiring.
The board’s primary function is to bridge the gap between the sensitive electronic components of the I/O modules and the harsh electrical environment of industrial field wiring. It typically includes components such as fuses, resistors, surge protection devices, and isolation barriers that protect the I/O modules from voltage spikes, electrical noise, and wiring faults. The TB711FC1 is designed for a specific type of I/O signal (analog input, analog output, digital input, or digital output) and matches the electrical characteristics of the corresponding FC module.

ABB TB711FC1

ABB TB711FC1

TB711FC1: Technical Specifications
  • ••
    Model Number:​ TB711FC1
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    Manufacturer:​ ABB (Bailey Controls)
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    Product Type:​ Termination Board
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    Compatible System:​ INFI 90 DCS
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    I/O Compatibility:​ FC Series I/O Modules
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    Connection Type:​ Screw terminal blocks for field wiring
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    Interface:​ Direct connection to FC I/O module via connector
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    Mounting:​ DIN rail or direct panel mounting
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    Signal Conditioning:​ Includes fusing, isolation, and/or surge protection as required
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    Safety Features:​ Fusing for overcurrent protection
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    Standards:​ Designed to meet industrial safety and EMI requirements

    ABB TB711FC1

    ABB TB711FC1

Core Features & Customer Value
The termination board’s primary value is in protecting expensive I/O modules from field-side electrical hazards. By providing a sacrificial interface, the TB711FC1 absorbs electrical transients and limits fault currents, preventing damage to the more complex and costly I/O modules. For maintenance teams, this design means that a wiring fault or lightning-induced surge typically damages only the termination board, which is far easier and less expensive to replace than an entire I/O module.
The organized terminal block arrangement significantly simplifies wiring and troubleshooting. Field wires are landed on clearly labeled terminals, making installation more efficient and reducing wiring errors. During maintenance, technicians can easily access test points and disconnect field circuits without disturbing the I/O module itself. This modular approach to field interfacing reduces system downtime during installation, commissioning, and troubleshooting.
Typical Applications
In a power generation plant, the TB711FC1 termination board interfaces with FC analog input modules to connect thermocouples and RTDs measuring turbine bearing temperatures and steam conditions. The board provides the necessary cold junction compensation for thermocouples and signal conditioning for the low-level millivolt signals.
In a chemical processing facility, the board connects to FC digital output modules to control motor-operated valves and solenoid valves. The termination board includes fuses to protect the output module from short circuits in the field wiring and may include surge suppression for inductive loads.

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