YOKOGAWA F3RS22-ON Safety-Enhanced Serial Communication Module for Harsh Industrial Sites
The YOKOGAWA F3RS22-ON is a ruggedized serial communication module engineered for the FA-M3 programmable controller platform, purpose-built to sustain reliable data exchange in high-interference, high-load, and safety-critical industrial environments. In continuous-process industries where communication integrity is non-negotiable — petrochemical plants, power generation facilities, metallurgical smelters, mining operations, and water treatment infrastructure — the F3RS22-ON delivers the signal stability and fault tolerance that control engineers depend on to prevent unplanned shutdowns and protect personnel.
Designed to operate within demanding control cabinet architectures, the F3RS22-ON supports RS-232C and RS-422/485 serial protocols, enabling seamless integration with field instruments, operator terminals, variable frequency drives, and third-party PLCs. Its robust hardware design addresses the most common failure vectors in industrial serial communication: signal drift under thermal stress, data corruption from electromagnetic interference, and communication timeouts caused by power transients. When deployed alongside the YOKOGAWA F3SP28-3N CPU module or the F3SP38-6N high-performance CPU, the F3RS22-ON forms a tightly coupled communication backbone that sustains loop integrity even under surge conditions.
Safety Reliability Table
| Parameter | Specification |
|---|---|
| Model / Full SKU | F3RS22-ON |
| Brand / Series | YOKOGAWA / FA-M3 |
| Product Type | Serial Communication Module |
| Supported Protocols | RS-232C, RS-422, RS-485 |
| Number of Channels | 2 channels |
| Communication Speed | Up to 115,200 bps |
| Isolation | Optical isolation between channels and backplane |
| EMI / Surge Protection | Built-in transient suppression; IEC 61000-4 compliant |
| Operating Temperature | 0°C to +55°C |
| Storage Temperature | -20°C to +70°C |
| Humidity | 10% to 90% RH (non-condensing) |
| Vibration Resistance | IEC 60068-2-6 compliant |
| Mounting | FA-M3 base unit slot (compatible with F3BU04-0N, F3BU08-0N, F3BU16-0N) |
| Power Consumption | ≤ 1.5 W (5 VDC from backplane) |
| Country of Origin | Japan |
| Outgoing Inspection | Full functional test prior to shipment |
| Warranty | 12 Months |
Control Cabinet Protection Strategy
In a well-engineered FA-M3 control cabinet, the F3RS22-ON does not operate in isolation — it is one layer in a multi-tier protection architecture. Upstream power quality is typically managed by the YOKOGAWA F3PU20-0S power supply module, which conditions the 24 VDC rail and suppresses voltage spikes before they reach communication circuitry. The F3RS22-ON itself provides optical isolation on each serial channel, preventing ground loops and common-mode noise from propagating into the CPU backplane.
For applications requiring high-density I/O alongside serial communication, the F3RS22-ON is commonly paired with the YOKOGAWA F3XD64-3H digital input module and the F3YD64-3H digital output module, both of which share the same FA-M3 base unit and benefit from the same backplane power conditioning. In safety interlock circuits, the F3XD32-3H safety-rated input module is often installed in the same rack to monitor emergency stop signals and process trip conditions, with the F3RS22-ON relaying status data upstream to the SCADA host via RS-485.
Analog process variables — pressure, temperature, flow — are typically acquired through the YOKOGAWA F3AD08-6R analog input module, whose 4–20 mA signals are digitized and then transmitted by the F3RS22-ON to historian servers or DCS gateways. Where Ethernet connectivity is also required, the F3LE01-5T Ethernet communication module can be installed in an adjacent slot, creating a dual-path communication architecture that maintains data flow even if one network segment is disrupted. For time-critical interlock loops, the F3SP59-7S safety CPU module can serve as the primary controller, with the F3RS22-ON handling non-safety serial traffic to reduce load on the safety CPU’s communication resources.
Critical Industrial Safety Applications
Petrochemical & Refinery Plants: In continuous distillation and reaction control systems, the F3RS22-ON maintains serial links between the FA-M3 controller and field-mounted analyzers, gas detectors, and flame scanners. Communication interruption in these environments can delay trip signal acknowledgment; the module’s optical isolation and surge suppression ensure that cable faults or ground potential differences do not corrupt the serial data stream.
Power Generation & Substation Automation: Turbine governor systems and excitation controllers rely on low-latency serial communication to coordinate protective relays and synchronization equipment. The F3RS22-ON’s RS-422 differential signaling supports cable runs exceeding 1,000 meters, making it suitable for distributed generator protection panels where long cable distances introduce significant common-mode noise.
Mining & Mineral Processing: Conveyor control systems, crusher automation, and slurry pump management in underground and open-pit mining environments expose communication modules to extreme vibration, dust ingress, and wide temperature swings. The F3RS22-ON’s IEC 60068-2-6 vibration rating and sealed connector design maintain signal integrity under these conditions, reducing the risk of false trips or missed fault signals.
Water & Wastewater Treatment: SCADA-linked pump stations and chemical dosing systems use RS-485 multi-drop networks to poll remote I/O and flow meters across large treatment facilities. The F3RS22-ON supports multi-drop RS-485 topologies with up to 32 nodes per channel, enabling cost-effective network expansion without additional communication hardware.
Metallurgy & Steel Production: Electric arc furnace control and rolling mill automation generate severe electromagnetic interference from high-current switching. The F3RS22-ON’s IEC 61000-4 EMC compliance and optical isolation provide the noise immunity required to sustain reliable communication in these high-interference environments, protecting the integrity of temperature control loops and safety interlock signals.
Safety and Quality FAQ
Q1: What warranty coverage is provided for the YOKOGAWA F3RS22-ON?
All F3RS22-ON units supplied by SMARTNEXMSK carry a 12-month warranty covering manufacturing defects and functional failures under normal operating conditions. Warranty claims are processed with priority turnaround to minimize control system downtime.
Q2: What outgoing inspection and testing is performed before shipment?
Every F3RS22-ON undergoes a full functional test prior to dispatch, including serial channel loopback verification on both RS-232C and RS-422/485 interfaces, backplane power draw measurement, and visual inspection for connector integrity. Test records are available upon request.
Q3: Is the F3RS22-ON compatible with all FA-M3 base units and CPU modules?
The F3RS22-ON is compatible with the full range of FA-M3 base units (F3BU04-0N, F3BU08-0N, F3BU16-0N) and is supported by FA-M3 CPU modules including the F3SP28-3N, F3SP38-6N, F3SP59-7S, and related variants. Compatibility with specific firmware revisions should be confirmed against the YOKOGAWA FA-M3 system configuration guide.
Q4: Can long-term supply and replacement support be guaranteed for critical installations?
SMARTNEXMSK maintains dedicated stock of FA-M3 series communication modules, including the F3RS22-ON, to support ongoing maintenance and emergency replacement requirements. For critical infrastructure projects requiring guaranteed supply continuity, blanket order arrangements and reserved inventory allocations are available — contact our technical sales team to discuss your specific requirements.
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