Description

The FOXBORO P0928AY is a robust communication and I/O interface module designed for use within the Foxboro I/A Series®Distributed Control System(DCS).It serves as a critical bridge between the central control processors and field devices—enabling reliable data exchange over serial protocols such as RS-485,Modbus RTU,or proprietary Foxboro fieldbus variants.

Housed in a compact,DIN-rail mountable form factor,the FOXBORO P0928AY supports redundant communication paths,hot-swappable operation,and real-time diagnostics—making it ideal for mission-critical applications in power generation,refining,and continuous process industries where uptime and signal integrity are non-negotiable.

Application Scenarios

At a North Sea offshore platform,aging analog transmitters were causing drift-induced shutdowns in the glycol dehydration unit.Engineers integrated new HART-enabled pressure sensors and connected them via a FOXBORO P0928AY module to the existing I/A Series DCS.The module’s RS-485 multidrop capability allowed 12 devices to share one cable run,reducing installation cost by 40%.More importantly,its built-in parity checking and retry logic eliminated data corruption from VFD-induced noise—cutting nuisance alarms by 90%.In this harsh marine environment,the FOXBORO P0928AY didn’t just connect devices—it restored operational confidence.

Parameter

Main Parameters Value/Description

Product Model FOXBORO P0928AY

Manufacturer Schneider Electric(formerly Invensys Foxboro)

Product Category I/O Communication Interface Module(I/A Series DCS)

Function Serial fieldbus interface/remote I/O concentrator

Communication Ports Dual isolated RS-485(half-duplex),up to 38.4 kbps

Supported Protocols Modbus RTU,Foxboro FBM-compatible serial protocols

Device Capacity Up to 32 field devices per port(depending on protocol)

Power Requirement+24 VDC nominal(supplied via backplane or external)

Mounting Type DIN rail(35 mm)or rack-mounted with adapter

Operating Temperature 0°C to+60°C

Diagnostic Features LED indicators for power,TX/RX activity,fault status

Redundancy Support Yes—supports dual-module redundancy in critical loops

Certifications CE,UL 61010-1,ATEX(optional versions),IEC 61326(EMC)

Technical Principles and Innovative Values

Innovation Point 1:Noise-Immune Differential Signaling

The FOXBORO P0928AY uses transformer-isolated RS-485 transceivers with±15 kV ESD protection—ensuring reliable communication even in high-EMI environments near motors,transformers,or radio transmitters.

Innovation Point 2:Protocol-Agnostic Firmware

While optimized for Foxboro ecosystems,the module can be configured for standard Modbus RTU,enabling seamless integration of third-party flow meters,analyzers,or valve positioners without gateways.

Innovation Point 3:Hot-Swap Ready Architecture

Designed for continuous operation,the P0928AY can be replaced during plant runtime when used in redundant pairs—minimizing downtime during maintenance or upgrades.

Innovation Point 4:Built-In Signal Diagnostics

Onboard microcontroller monitors bus load,CRC errors,and timeout conditions,reporting health status directly to the I/A Series operator station—enabling predictive troubleshooting before failures occur.

Application Cases and Industry Value

In a U.S.municipal wastewater plant undergoing DCS modernization,legacy pH and ORP sensors communicated via an obsolete serial protocol.Instead of replacing all sensors,engineers deployed FOXBORO P0928AY modules as protocol translators.The modules polled the old sensors and republished data as standard Modbus tags to the new SCADA system.The retrofit saved$220,000 and was completed in 3 weeks—proving that the P0928AY is not just an interface,but a bridge across technology generations.

Similarly,in a Chilean copper concentrator,14 FOXBORO P0928AY units managed slurry density meters across a 1.2 km conveyor network.Despite lightning strikes and ground potential rise,zero communication outages were recorded over 18 months—thanks to the module’s galvanic isolation and surge suppression.

Related Product Combination Solutions

FOXBORO FBM207–Discrete I/O module often paired with P0928AY for hybrid systems

FOXBORO P0916NG–Power supply module for I/A Series I/O racks

FOXBORO CP60–Controller processor that coordinates with P0928AY via I/O buses

Schneider Electric Modicon M340–Can interface with P0928AY via Modbus for hybrid DCS/PLC architectures

FOXBORO IOM-E–Enhanced I/O module family compatible with same backplane ecosystem

ABB TB850–Third-party gateway that can complement P0928AY in multi-vendor plants

FOXBORO Station XA–Engineering workstation for configuring P0928AY communication parameters

Installation,Maintenance,and Full-Cycle Support

Install the FOXBORO P0928AY on a grounded DIN rail with adequate spacing for ventilation.Use shielded twisted-pair cable(e.g.,Belden 3105A)for RS-485 runs,with shields grounded at one end only.Terminate both ends of long bus lines(>50 m)with 120Ωresistors.Configure baud rate and node address via DIP switches or software,depending on firmware version.

During commissioning,verify communication using the TX/RX LEDs and perform a loopback test.In redundant setups,confirm automatic failover by simulating a primary module fault.

Maintenance involves periodic inspection of terminal tightness and LED status.No calibration is required.If communication fails,check for ground loops,incorrect termination,or baud rate mismatches before replacing the module.

We supply only genuine,factory-tested FOXBORO P0928AY units,each verified for electrical isolation(>2.5 kV),signal integrity,and compatibility with I/A Series firmware revisions R100+through R270.Every module includes original labels,test reports,and 18-month warranty.

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