Yokogawa STARDOM FCN Series Modules: 720254 Communication Module

Technical Dossier

Product Details And Specifications

Yokogawa STARDOM FCN Series Technical Notes

The Yokogawa STARDOM FCN (Field Control Node) series is a field-proven distributed control and safety platform deployed across global heavy industries including petrochemical complexes, nuclear power facilities, offshore oil & gas platforms, and continuous-process refineries. The FCN architecture combines PLC-class real-time control with DCS-grade reliability, operating under IEC 61131-3 programming standards. Its modular backplane design allows scalable I/O expansion without system shutdown, making it a preferred platform for long-lifecycle industrial installations where uptime is non-negotiable. The 720254 is a communication module within this ecosystem, providing protocol-level connectivity between the FCN controller and field networks or supervisory systems.

The Evolution of STARDOM FCN Architecture

The STARDOM platform was introduced by Yokogawa in the early 2000s as a hybrid controller bridging traditional PLC and DCS paradigms. The first-generation FCN-100 established the modular I/O bus architecture. Subsequent generations introduced redundant CPU modules, expanded communication protocol support (FOUNDATION Fieldbus, PROFIBUS-DP, Modbus TCP, OPC-UA), and tighter integration with Yokogawa's CENTUM VP DCS via Vnet/IP. The FCJ (Field Control Junction) variant addressed compact installations. By the 2010s, the FCN-RTU extended the platform to remote terminal unit applications with low-power operation. Compatibility across generations is maintained at the backplane bus level, though firmware versions must be matched when replacing CPU or communication modules. Modules from the 720xxx numbering range are predominantly communication and interface cards introduced during the mid-cycle platform refresh, designed to coexist with both legacy FCN-100 backplanes and current-generation FCN-500 chassis.

STARDOM FCN Full Catalog & Functionalities (SKU List)

Controllers / CPU Modules

• FCN-100: First-generation FCN base controller unit, IEC 61131-3, 10/100 Ethernet
• FCN-500: Current-generation FCN controller with dual Ethernet, enhanced memory, USB config port
• FCJ-100: Compact field control junction unit for space-constrained installations
• F3SP28-3N: High-speed sequence CPU module, 28K steps, built-in Ethernet port
• F3SP38-6N: Mid-range sequence CPU, 60K steps, dual-port Ethernet, IEC 61131-3
• F3SP58-6H: High-capacity CPU, 120K steps, supports motion and PID control loops

Communication & Interface Modules

• 720254: Communication module providing protocol gateway functionality within FCN backplane
• F3LC11-1F: FL-net (OPCN-2) communication module, 10 Mbps, up to 64 nodes
• F3LC12-1F: FL-net module with extended node support and diagnostics
• F3LE01-5T: Ethernet communication module, 100BASE-TX, Modbus TCP master/slave
• F3LP01-0N: PROFIBUS-DP master module, up to 125 slave nodes, 12 Mbps
• F3LR01-0N: RS-232C/RS-485 serial communication module, Modbus RTU support
• F3LD01-0N: DeviceNet master module, 64 nodes, explicit and I/O messaging

Digital I/O Modules

• F3XD32-3F: 32-channel DC digital input module, 24 VDC, source/sink compatible
• F3YD32-3F: 32-channel DC digital output module, 24 VDC, 0.5 A per channel
• F3XD64-3F: 64-channel high-density digital input, 24 VDC, compact footprint

Analog I/O Modules

• F3AD08-6R: 8-channel analog input, 4–20 mA / 0–10 V, 16-bit resolution
• F3DA04-6R: 4-channel analog output, 4–20 mA, 16-bit resolution, HART-compatible
• F3AD04-6V: 4-channel high-accuracy analog input, ±10 V, 16-bit, isolated

Power Supply Modules

• F3PU20-0S: 20 W power supply module, 24 VDC input, backplane bus regulation
• F3PU30-0S: 30 W redundant-capable power supply, dual-feed input support

Quality Control for the STARDOM FCN Range

FCN communication modules, including the 720254, undergo a structured verification process before dispatch. Each unit is powered on a compatible FCN backplane test rig and subjected to: (1) firmware version identification and logging; (2) backplane bus communication integrity check using Yokogawa's diagnostic protocol; (3) port-level loopback testing for all active communication interfaces; (4) thermal soak at 50°C for 2 hours to screen latent component failures; (5) final functional verification against a reference FCN-500 controller. I/O modules are tested under live signal injection — analog modules verified against calibrated current/voltage sources, digital modules verified with relay-driven contact simulation. All test results are documented and shipped with each unit.