Model Interpretation

4351B: Tricon Communication Module (TCM), 2‑Ethernet/4‑Serial, SIL3, TMR

P/N: 3000591‑xxx series

Family: 4351 (base), 4351B (enhanced firmware/isolated ports)

Compatibility: Tricon v10+ chassis; hot‑swappable; works with TMR/non‑TMR configurations

Technical Parameters

Electrical & Power

Power: 24VDC (backplane‑supplied, 20.4–28.8VDC)

Isolation: 500VDC between all ports; 2500Vrms port‑to‑backplane

Redundancy: TMR 2oo3 communication channels (matches Tricon controller TMR)

Communication Interfaces

Ethernet (2 × RJ‑45): 10/100Mbps, auto‑neg; supports Modbus TCP/IP (Master/Slave), TriStation, TSAA, SNTP, JetDirect

NET1: Peer‑to‑Peer (P2P) & time sync

NET2: Standard TCP/IP

Serial (4 × DB‑9): RS‑232/RS‑485, up to 115.2Kbps; Modbus RTU (Master/Slave)

Port1: Modbus or Trimble GPS

Port4: Modbus or TriStation

Debug Port: 1 × DB‑9 (service only)

Mechanical

Form Factor: 3U, 19” rack, 1 slot

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

Weight: ~2.3 kg (5.0 lbs)

Mounting: Plug‑in backplane, hot‑swappable

Environmental

Operating Temp: −40°C to +70°C

Storage Temp: −40°C to +85°C

Humidity: 5%–95% RH, non‑condensing

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

Diagnostics & Indicators

LEDs: PASS, FAULT, NET1, NET2, COM1–COM4

Monitoring: Port status, link integrity, error counters, TMR channel voting health

Protection: ESD, surge, short‑circuit, overtemperature

Core Functions

SIL3 Safety Communication

TMR architecture with 2oo3 voting ensures no single‑point failure; all communication paths are SIL3‑compliant for safety loops.

Multi‑Protocol Gateway

Bridges Tricon SIS to external systems via Modbus TCP/RTU, TriStation, TSAA, SNTP—unifying safety and process data.

High‑Speed, Isolated I/O

2 × 10/100Mbps Ethernet + 4 × high‑speed serial ports with 500VDC isolation; prevents ground loops and voltage spikes.

Hot‑Swap & Redundancy

Online replacement without shutdown; dual Ethernet ports support network redundancy for maximum availability.

Engineering & Diagnostics

TriStation connectivity for programming/monitoring; real‑time port diagnostics reduce unplanned downtime.

Applications

Oil & Gas: SIS‑to‑DCS communication, ESD valve monitoring, remote wellsite control

Power Generation: Boiler SIS‑to‑DCS interface, turbine safety data exchange, BMS networking

Chemical/Refining: SIL3 loop data sharing, Modbus device integration, TriStation remote engineering

Critical Infrastructure: Safety system networking, time synchronization (SNTP), redundant communication backbones