Foxboro 303391 0303391 I/A Series Processor Modules

Foxboro 303391 I/A Series Processor Module

The Foxboro 303391, also cataloged as the 0303391 Processor Module, operates as a dedicated hardware component for executing real-time process control algorithms and managing fieldbus module (FBM) data exchanges within Foxboro I/A Series DCS networks. The unit processes field sensor signals, updates control loops, and transfers system status data over the internal system backplane. Its architecture accommodates single or redundant dual-processor configurations to maintain uninterrupted control execution.

Hardware Specifications

FOUNDATION Fieldbus and Channel Isolation Integrations

The module coordinates communication timing across fieldbus networks, managing serial and fieldbus module interface channels without imposing processing latency on core control loops. Internal isolation barriers prevent electrical transients on primary communication buses from propagating into the central processing unit and onboard 16 MB SDRAM memory. When integrated into distributed process control topologies, the module resolves signal data from connected 4-20 mA HART transmitters and FOUNDATION Fieldbus segments, maintaining deterministic loop execution cycles under heavy bus traffic loads.

Frequently Asked Questions

Q: What power input and wattage limitations apply to the 303391 processor module?

A: The module operates on a nominal 24 VDC supply with dual redundant input support, consuming a maximum of 8.5 W per non-fault-tolerant unit.

Q: How does the module maintain control continuity in fault-tolerant configurations?

A: When paired in a dual-processor configuration, the primary processor syncs memory states to the redundant backup unit over dedicated hardware channels, enabling seamless control transfer if a primary fault occurs.

Field Installation Guidelines

Mount the processor module securely into the designated Foxboro I/A Series baseplate slot, verifying that the backplane connector pins align properly prior to final insertion. Secure all retaining screws to maintain ground continuity across the chassis.

Connect dual 24 VDC power feeds to the primary and secondary terminal blocks to establish power redundancy. Route all system bus cables and fieldbus communication wiring through separate trunking channels, keeping them isolated from high-voltage AC power lines to minimize inductive interference. Ground the enclosure frame directly to the main system earth bar using a low-impedance copper grounding wire.