Triconex 4354 Fiber TCM Communication Module

Product Overview

The 4354 is a fiber-optic Triconex Communication Module (TCM) manufactured by Invensys Triconex for the Tricon v9–v10 safety systems. It provides dual 100 Mbps fiber-optic Ethernet ports (MT-RJ) and four RS-232/RS-485 serial ports, enabling high-speed deterministic communication between Tricon controllers, operator workstations, Modbus devices, and external hosts. The module supports GPS and SNTP time synchronization for sequence-of-events (SOE) logging and redundant controller timekeeping.

Key Specifications

• System: Invensys Triconex Tricon v9–v10
• Type: TCM Communication Module (Fiber)
• Ethernet Ports: 2 × 100 Mbps fiber-optic (MT-RJ)
• Serial Ports: 4 × RS-232/RS-485 (TriStation-configurable)
• Serial Protocols: Modbus master/slave, Trimble GPS, TriStation
• Time Synchronization: GPS, SNTP, Triconex Time Sync via DLC or UDP/IP
• Network Redundancy: Supports redundant TCM pairs in redundant controller networks
• Debug Port: 1 × RS-232 (Triconex use only)
• Front Panel Indicators: Status and communication LEDs
• Mounting: Tricon chassis slot (COM or logical slot)

Features & Benefits

1. Fiber-Optic Ethernet: Dual 100 Mbps MT-RJ fiber ports provide galvanic isolation and immunity to EMI, ideal for long-distance control network segments.
2. Multi-Protocol Serial: Four configurable serial ports support Modbus RTU/ASCII, GPS time sync, and TriStation engineering access without external converters.
3. Precise Time Synchronization: GPS and SNTP protocols ensure microsecond-accurate time stamping for SOE logs and coordinated shutdown sequences.
4. Redundant Network Support: Dual TCM installation in redundant controllers enables fault-tolerant communication paths with automatic failover.
5. Deterministic Control Network: TCM architecture guarantees consistent message delivery times for safety-critical peer-to-peer and host communications.

FAQ

Q: What is the difference between 4354 and 4351B?
A: The 4354 uses fiber-optic Ethernet ports (MT-RJ). The 4351B uses copper RJ-45 Ethernet ports. Both provide the same serial and time sync functionality. Select 4354 for EMI-prone or long-distance fiber installations.

Q: Can 4354 and 4351B TCMs be mixed in the same logical slot?
A> No. Models 4354 and 4351B cannot be mixed in the same logical slot or even in different chassis within the same redundant pair. Standardize on one fiber or copper model per system.

Q: What fiber type does the 4354 require?
A> The 4354 uses multi-mode fiber-optic cables with MT-RJ connectors. Verify your plant fiber infrastructure supports multi-mode 62.5/125 μm or 50/125 μm cable.

Installation Guide

• Install the TCM into a COM slot or logical slot in the Tricon chassis.
• Connect multi-mode fiber cables with MT-RJ connectors to both Ethernet ports for redundant network paths.
• Connect serial devices (Modbus, GPS) to the RS-232/RS-485 ports using appropriate cables.
• Configure time synchronization (GPS or SNTP) via TriStation 1131 software.
• Verify communication status via the front-panel LEDs and TriStation diagnostic monitor.

Selection Tips

• Media Type: Choose the 4354 for fiber-optic control networks in electrically noisy environments or where cable runs exceed copper distance limits. For standard copper networks, select 4351B.
• Redundancy: For high-availability architectures, install two 4354 modules (left and right slots) with redundant fiber paths to independent network switches.
• Serial Count: The four serial ports support multiple Modbus RTU segments. Calculate total serial device count and baud rate requirements to ensure port capacity.
• Time Source: For SOE accuracy, connect a GPS receiver to one serial port and configure SNTP as a backup time source on the Ethernet interface.