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- Yokogawa
- F3LC31-2F
- Modbus Interface Module
- Japan
- 28.9 x 100 x 83.2 mm
- 0.13 kg
- Xiamen, China
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Product Overview
The Yokogawa F3LC31-2F is a Modbus Interface Module designed for the FA-M3 PLC system. It enables communication between a PLC and external devices using the Modbus RTU / Modbus ASCII protocol, allowing integration with third-party industrial equipment such as drives, sensors, analyzers, and other controllers.
This module supports both master and slave modes, making it highly flexible for industrial network architectures where FA-M3 systems must communicate with heterogeneous automation devices.
Technical Specifications
| Parameter | Details |
|---|---|
| Manufacturer | Yokogawa |
| Model | F3LC31-2F |
| Product Type | Modbus Interface Module |
| System Compatibility | FA-M3 PLC system |
| Communication Protocol | Modbus RTU / Modbus ASCII |
| Interface Standard | RS-422 / RS-485 |
| Transmission Mode | Half-duplex (2-wire / 4-wire selectable) |
| Transmission Speed | 300 bps – 115.2 kbps |
| Transmission Distance | Up to 1200 m |
| Port Count | 1 isolated communication port |
| Network Function | Master / Slave support |
| Data Format | 7 or 8 data bits, parity selectable |
| Stop Bits | 1 or 2 |
| Error Detection | CRC-16 (RTU), LRC (ASCII) |
| Termination | Built-in terminator switch |
| Dimensions | 28.9 × 100 × 83.2 mm |
| Weight | 0.13 kg |
Function and Working Principle
The F3LC31-2F acts as a protocol conversion and communication interface module, enabling FA-M3 PLCs to exchange data with Modbus-compatible devices.
Working Principle
- PLC CPU sends or requests data via internal bus
- The module formats data into Modbus RTU/ASCII frames
- Signals are transmitted via RS-422/RS-485 network
- External devices respond with process data
- Module converts responses back into PLC-readable format
PLCFA−M3↔Modbus RTU/ASCIIPLC_{FA-M3} \leftrightarrow Modbus\, RTU/ASCII
Key Functions
- Enables Modbus RTU / ASCII communication
- Supports both master and slave modes
- Allows integration with third-party devices
- Provides stable long-distance serial communication
- Handles protocol framing and error checking internally
- Supports industrial multi-device communication networks
- Enables PLC interoperability in open automation systems
System Role
The module acts as a communication bridge:
FA-M3 PLC ↔ F3LC31-2F ↔ Modbus Devices
It is commonly used for:
- Connecting VFDs (variable frequency drives)
- Integrating smart sensors and analyzers
- Linking third-party PLCs or controllers
- Supervisory control systems (SCADA integration)
- Distributed industrial automation networks
Industrial Applications
- Oil & gas automation systems
- Petrochemical plants
- Power generation facilities
- Water treatment systems
- Manufacturing automation
- HVAC control systems
- Process instrumentation networks
- Industrial energy monitoring systems
Installation Guidelines
- Install in FA-M3 rack system only
- Use shielded twisted-pair RS-485/RS-422 cable
- Configure baud rate and parity correctly for all devices
- Use termination resistors at network ends
- Maintain grounding to reduce noise interference
- Ensure consistent Modbus addressing across network
Compatible Systems
- Yokogawa FA-M3 PLC CPUs
- Modbus RTU / ASCII field devices
- VFDs and motor drives
- Industrial sensors and analyzers
- SCADA and HMI systems
Key Advantages
- Supports widely used Modbus protocol standard
- Flexible master/slave operation modes
- Long-distance communication up to 1200 m
- High noise immunity in industrial environments
- Compatible with a wide range of third-party devices
- Compact and lightweight design (0.13 kg)
- Easy integration into existing FA-M3 systems
Technical FAQs
Q1: What is the main function of the F3LC31-2F?
It enables FA-M3 PLCs to communicate with Modbus RTU/ASCII devices.
Q2: Does it support both master and slave modes?
Yes, it supports both communication roles depending on system configuration.
Q3: What protocol does it use?
Modbus RTU and Modbus ASCII over RS-422/RS-485.
Q4: What devices can it connect to?
It can connect to VFDs, sensors, meters, PLCs, and other Modbus devices.
Conclusion
The Yokogawa F3LC31-2F Modbus Interface Module is a versatile industrial communication gateway for FA-M3 PLC systems. With support for Modbus RTU/ASCII and both master/slave modes, it enables seamless integration between Yokogawa controllers and third-party industrial devices in distributed automation environments.