The P8151B is a high-reliability Analog Input module designed for use within the ABB Advant Controller series, specifically integrated into Triple Modular Redundant (TMR) architectures. This module is engineered for mission-critical applications where system uptime and fault tolerance are non-negotiable, such as emergency shutdown (ESD) systems and fire and gas monitoring.
Technical Datasheet
Product Specifications
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Model Number: P8151B
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Module Type: TMR Analog Input (Triple Modular Redundant)
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Channels: 8 or 16 Differential Channels (configuration dependent)
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Input Range: 4-20 mA, 0-20 mA, or 1-5 VDC
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Resolution: 12-bit to 16-bit A/D conversion
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Redundancy: 2-out-of-3 (2oo3) voting logic per channel
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Isolation: Galvanic isolation between channels and system logic
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Power Consumption: Typically 5W to 8W at 24V DC
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Dimensions: 233mm x 160mm x 40mm
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Weight: 0.85 kg
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Country of Origin: Sweden / Switzerland
Application Areas
The P8151B is deployed in heavy industrial sectors including power generation (turbine control), petrochemical processing, and offshore oil platforms. It is specifically used to monitor critical sensors like pressure transmitters, temperature gauges, and flow meters where a single point of failure could lead to hazardous conditions or costly production halts.
Product Instructions
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Hardware Configuration: Before installation, verify the jumper settings or DIP switch positions on the module base to match your required input signal type (e.g., current vs. voltage).
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Installation: Insert the module into the designated TMR I/O slot of the Advant subrack. Ensure the locking mechanisms are fully engaged to maintain a consistent connection to the backplane.
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Wiring: Connect field signals to the corresponding termination unit. For TMR operation, ensure that the field loop is distributed correctly across the redundant input paths as specified in the ABB system wiring diagram.
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Software Setup: Use the ABB engineering tool (such as Control Builder or AMPL) to define the hardware tree. Assign the P8151B to the correct address and configure the filtering and scaling parameters for each analog point.
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Hot Swap: This module supports “hot-swapping.” If a fault is detected in one leg of the TMR circuit, the module can be replaced while the system remains online, provided the other two legs are healthy.
Q&A: Frequently Asked Questions
How does the TMR voting work in the P8151B? The module processes signals through three independent internal paths. The system performs a 2-out-of-3 vote on the digitized data. If one path deviates significantly from the others, the system flags a “faulty leg” but continues to operate accurately using the remaining two healthy paths.
Can I use the P8151B for non-redundant applications? While technically possible, it is not cost-effective. The P8151B is specifically built with the extra circuitry required for TMR. For standard applications, a simplex analog input module from the same series would be more appropriate.
What is the meaning of a solid red LED on the front panel? A solid red “F” (Fault) LED typically indicates a hardware failure within the module’s internal logic or a total loss of communication with the controller. If the LED is flashing, it may indicate a channel-specific configuration error or an out-of-range field signal.
Does this module require external terminal blocks? Yes, the P8151B must be paired with a compatible ABB Termination Unit (TU) or Baseplate. The specific TU choice depends on whether you require fused inputs or HART transparency.
Recommended Similar Models
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ABB P8151A (Standard version of the Analog Input module)
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ABB P8152B (TMR Digital Input Module)
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ABB P8153B (TMR Analog Output Module)
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ABB P8154 (TMR Pulse Input Module)
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ABB DSDI 110A (Simplex Digital Input Component)
