Model Interpretation

4609: Advanced Communication Module (ACM), Foxboro I/A Nodebus Gateway, SIL3, TMR

P/N: 3000591‑xxx series

Family: 4609 (Foxboro‑only gateway; no Ethernet/serial/Hiway)

Compatibility: Tricon 8110/8111/8112 chassis; hot‑swappable; TMR/non‑TMR compatible

Key Distinction: Foxboro Nodebus exclusive (vs 4119A serial, 4351B Ethernet+serial, 4509 Honeywell Hiway)

Technical Parameters

Electrical & Power

Power: 24VDC (backplane, 20.4–28.8VDC), 1.2A max

Isolation: 2500Vrms port‑to‑backplane; galvanic isolation for Nodebus

Redundancy: TMR 2oo3 voting; supports dual Nodebus network redundancy

Communication Interfaces

Nodebus Port (1×Proprietary): Isolated, connects to Foxboro I/A Series Nodebus

Data Mapping: Transfers Tricon aliased data (system variables, diagnostics) to I/A Series

Alarms: Propagates Tricon alarms to I/A consoles/printers as system messages

No Ethernet/Serial/Hiway: No Modbus, TCP/IP, or Honeywell Hiway support

Mechanical

Form Factor: 3U, 19” rack, 1 slot

Dimensions (W×H×D): 483 × 127 × 305 mm

Weight: ~2.4 kg

Mounting: Plug‑in backplane, hot‑swappable

Environmental

Operating Temp: 0°C to +60°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% RH, non‑condensing

Certifications: IEC 61508 SIL3, TÜV, UL, CE, ATEX, FM

Diagnostics & Indicators

LEDs: PASS, FAULT, NODEBUS

Monitoring: Nodebus link status, error counters, TMR voting health

Protection: ESD, surge, short‑circuit, overtemperature

Core Functions

Foxboro I/A Series DCS Gateway

The only Tricon module natively supporting Foxboro Nodebus; bridges Tricon SIS to I/A Series without middleware.

SIL3 Fault‑Tolerant Communication

TMR 2oo3 voting ensures no single‑point failure; all data paths comply with SIL3 for safety loops.

Seamless Data & Alarm Integration

Transfers Tricon process data, system variables, and diagnostics to I/A Series; propagates Tricon alarms to I/A operator workstations in familiar formats.

Hot‑Swap & Redundancy

Online replacement without shutdown; dual Nodebus support for network redundancy.

Legacy System Modernization

Connects Tricon SIS to Foxboro I/A Series (legacy and modern) without DCS replacement.

Applications

Oil & Gas: Tricon ESD/F&G integration with Foxboro I/A Series DCS; wellsite safety data exchange

Chemical/Refining: SIL3 safety data sharing between Tricon SIS and Foxboro DCS; batch process safety

Power Generation: Boiler BMS/Turbine TMC connectivity to Foxboro I/A Series; safety loop monitoring

Legacy System Upgrades: Integrating Foxboro I/A Series with modern Tricon SIS