YOKOGAWA FA-M3 F3RZ81-ON Communication Module

Name: YOKOGAWA FA-M3 F3RZ81-ON Communication Module
Brand: Yokogawa

Model: F3RZ81-ON

Brand Yokogawa

Series FA-M3 F3RZ81-ON

Model F3RZ81-ON

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Product Details And Specifications

YOKOGAWA FA-M3 Series Technical Notes

The YOKOGAWA FA-M3 (also marketed under the STARDOM platform for process-oriented applications) is a modular programmable controller system with a documented installation base across global heavy industry sectors including petrochemical complexes, nuclear auxiliary systems, offshore platforms, and continuous-process refineries. The FA-M3 architecture is characterized by a high-speed backplane bus, deterministic scan cycle performance, and a broad I/O module library that supports both discrete and analog signal types. Its multi-CPU configuration capability and redundancy options have made it a standard reference design in safety-instrumented and high-availability control loops. The F3RZ81-ON specifically functions as a communication interface module within this ecosystem, enabling protocol-level integration between the FA-M3 rack and external networks or host systems.

The Evolution of FA-M3 Architecture

The FA-M3 platform was introduced by YOKOGAWA in the mid-1990s as a successor to earlier YEWMAC and FA500 controller families. The initial hardware generation used a parallel backplane with proprietary inter-module communication. Subsequent revisions introduced the F3-series module designation, standardizing the physical form factor and electrical interface across CPU, I/O, and communication module types.

The F3SP-series CPU modules (e.g., F3SP28-3N, F3SP38-6N, F3SP58-6H, F3SP67-6S) represent successive generations of processing capability, with later variants supporting IEC 61131-3 structured text and function block programming in addition to ladder logic. Communication architecture evolved from point-to-point RS-232/RS-422 links (F3LC01, F3LC11) through Ethernet TCP/IP modules (F3LE01-5T, F3LE12-5T) and fieldbus adapters (PROFIBUS-DP via F3LP01-0N, DeviceNet via F3LD01-0N). The F3RZ-series modules address specific remote I/O and network extension requirements within this lineage. Compatibility constraints exist between early-generation base units (F3BU04-0N, F3BU06-0N) and later high-density I/O modules; slot assignment rules and power budget calculations must be verified against the FA-M3 system configuration manual (IM 34M06C11-01E) before substitution.

FA-M3 Full Catalog & Functionalities (SKU List)

The following SKUs represent verified, commonly stocked modules within the YOKOGAWA FA-M3 product family. Modules are grouped by functional category.

CPU Modules

F3SP28-3N: Sequence CPU, 14K steps, RS-232C port, basic ladder support.
F3SP38-6N: Sequence CPU, 30K steps, dual RS-232C, expanded I/O capacity.
F3SP58-6H: High-speed CPU, 60K steps, Ethernet-ready, IEC 61131-3 support.
F3SP67-6S: High-performance CPU, 120K steps, multi-task execution, SFC support.
F3SP76-7S: Advanced CPU, 250K steps, redundancy-compatible, high-speed scan.

Communication Modules

F3RZ81-ON: Remote I/O master/slave communication module; enables distributed rack extension over dedicated FA-M3 network link.
F3LC01-1F: Serial communication module, RS-232C, point-to-point protocol support.
F3LC11-1F: Serial communication module, RS-422/RS-485, multi-drop capable.
F3LE01-5T: Ethernet communication module, 10BASE-T, Modbus TCP and proprietary protocol.
F3LE12-5T: Ethernet communication module, 100BASE-TX, enhanced throughput for SCADA integration.
F3LP01-0N: PROFIBUS-DP master module, supports up to 125 slave nodes.
F3LD01-0N: DeviceNet master/slave module, CIP-compliant messaging.

Analog I/O Modules

F3AD04-1N: 4-channel analog input, 4–20 mA / 1–5 V, 12-bit resolution.
F3AD08-4N: 8-channel analog input, multi-range, 16-bit resolution.
F3DA04-1N: 4-channel analog output, 4–20 mA / 1–5 V, 12-bit resolution.

Digital I/O Modules

F3XD32-3F: 32-channel DC digital input, 24 VDC, sink/source compatible.
F3YD32-3F: 32-channel DC digital output, 24 VDC, transistor output, 0.1 A per point.
F3XD16-3N: 16-channel DC digital input, isolated, high-noise-immunity design.

Power Supply Modules

F3PU20-0S: Power supply module, 100–240 VAC input, 5 VDC / 4 A output, for standard base units.
F3PU10-0S: Power supply module, 24 VDC input, compact form factor for panel-mount applications.

Quality Control for the FA-M3 Range

FA-M3 communication modules including the F3RZ81-ON present specific verification challenges due to their backplane-dependent initialization sequence and network-layer handshake requirements. DriveKNMS applies a structured test protocol for this module category:

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