Foxboro P0916AW 24-Point Contact Input Module

Description

Foxboro P0916AW 24-Point Contact Input Module

Product Dimensions：

The Foxboro P0916AW (often superseded by the active part number RH916AW) is a specialized Compression Termination Assembly (TA) designed for use within the Invensys Foxboro I/A Series (now Schneider Electric EcoStruxure Foxboro DCS) distributed control system. Specifically, it acts as the field wiring interface for the FBM241 / FBM241c Channel Isolated Discrete I/O Modules.

Product Detailed Description

The P0916AW is a DIN-rail or rack-mounted termination assembly. Its primary purpose is to safely route and connect field-level discrete inputs and outputs (such as switches, solenoid valves, and relays) to the FBM241/FBM241c Fieldbus Modules.

It provides compression-type terminal blocks for easy, secure point-to-point field wiring, and utilizes specialized multi-core ribbon cables to plug directly into the 200 Series FBM baseplate.

Technical Parameters

Product Advantages

• Galvanic Isolation: Combined with the FBM241, the TA ensures that each discrete input/output channel is electrically isolated from other channels and from ground, protecting sensitive DCS controller electronics from field-side voltage spikes.
• Rapid Maintenance & Hot-Swapping: Since the field wiring is terminated on the P0916AW assembly rather than the active FBM processor, an FBM241 module can be unplugged or swapped live without disconnecting any field wiring.
• Robust Environmental Durability: Designed to handle severe industrial climates, boasting a Class G3 conformal-equivalent rating for protection against corrosive gases.
• Vibration Resistance: The physical screw compression terminals provide an extremely high level of mechanical contact stability, critical for machinery environments.

Important Considerations (Precautions)

• Inductive Load Protection: When using the discrete output channels with DC inductive loads (such as heavy solenoid valves or mechanical relays), external diodes must be installed across the loads to suppress flyback voltage spikes.
• External Excitation: Depending on how the loop is wired, external power supplies (excitation) must be properly fused and grouped to prevent single-point faults from disabling all 8 channels simultaneously.
• Cable Strain Relief: Ensure the interface cable connecting the P0916AW to the FBM baseplate has adequate bend-radius relief and is secured; excessive pulling can damage the baseplate pins.

Product Applications

The P0916AW is commonly deployed in heavily instrumented continuous process industries, including:

• Chemical & Petrochemical Processing: Interfacing field-mounted safety limit switches and valve positioners to the Foxboro DCS.
• Power Generation: Connecting sequence-of-events (SOE) digital inputs (like generator trips and main valve sensors) to the control system.
• Water/Wastewater Treatment: Relaying digital start/stop signals to high-capacity pumps and clarifying drives.
• Modernization Projects (Migration): Used in conjunction with Emerson DeltaV Flex.Connect systems to migrate legacy Foxboro I/O channels directly to modern automation environments without needing to run new field cables.

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