BCNet‑CJ Ethernet Module for Omron CJ‑Series PLCs

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BCNet‑CJ adds Ethernet data, FINS TCP/UDP and Modbus TCP connectivity to Omron CJ1/2/CS1 PLCs—plug‑and‑play, ideal for SCADA and industrial networking.

Product Overview
BCNet‑CJ is an affordable Ethernet communication adapter for Omron CJ1, CJ2, CS1 (and compatible NX1P/CG1) PLCs. It plugs directly into the PLC’s RS‑232 DB9 port without external power, and supports key protocols like Omron FINS TCP/UDP, Modbus TCP, and BCNetTCP transparent mode. It enables multiple upper computer connections (HMI, SCADA, OPC, VB/C# applications) for real‑time monitoring and control.

How to Use

  1. Insert BCNet‑CJ into the PLC’s DB9 RS‑232 port—no extra wiring or power needed.
  2. If required, connect external 24 V DC (module may draw power from serial port).
  3. Use the built‑in Web UI or setup tool to access the default IP (often 192.168.1.178) for configuration.
  4. Choose communication protocol: FINS TCP/UDP, Modbus TCP, or BCNetTCP. Automatically map PLC memory to Modbus registers.
  5. Connect SCADA, HMI, or OPC servers via Ethernet.
  6. Update firmware through the Ethernet interface if needed.
    Tips: match network IP/subnet and serial baud rate to PLC settings; for better multi‑master compatibility, use FINS TCP.

Frequently Asked Questions (FAQ)

  1. Which Omron PLCs are supported?
    Designed for CJ1, CJ2, CS1 series and compatible models (e.g., NX1P, CG1) with DB9 RS‑232 port.
  2. Does BCNet‑CJ require external power?
    It can be powered by the PLC serial port; external 24 V may be added if necessary.
  3. What communication protocols are available?
    Supports FINS TCP/UDP, Modbus TCP, BCNetTCP transparent mode.
  4. How many client connections does it support?
    Up to approximately 10 simultaneous TCP/UDP connections for SCADA, OPC, HMI, etc.
  5. Is it truly plug‑and‑play?
    Yes—it auto-detects the PLC model and synchronizes serial parameters without user intervention.
  6. Which SCADA systems are compatible?
    Works with most industrial SCADA, OPC servers, HMI packages that support FINS or Modbus TCP.
  7. Firmware updates possible?
    Yes—firmware can be upgraded over Ethernet.
  8. Operating environment?
    Typically rated for industrial ranges (check seller documentation).
  9. Are there size or weight details?
    Exact dimensions/weight not disclosed in available listings.
  10. What support is available?
    Documentation may be limited; check with seller or forum communities if needed.

User Review Summary
Few public user reviews, but listings on platforms like eBay highlight a low-cost, compact design. Buyers report: no wiring needed, ease-of-use plugging into the DB9 port, and stable performance. Limitations include minimal official documentation and limited customer support.

Comparison with Competing Products
• Compared to Omron’s native Ethernet option boards: BCNet‑CJ is lower cost and easier to install, but lacks full native integration and may offer fewer protocol capabilities.
• Compared to generic RS‑232 to Ethernet converters: BCNet‑CJ includes PLC‑specific awareness (FINS/PLC memory mapping) which generic converters typically omit.

Technical Specifications
• Interface: DB9 RS‑232 male to PLC serial port
• Power: Via serial port or external 24 V DC
• Ethernet: RJ45, 10/100 Mbps, Auto‑MDIX
• Protocols: FINS TCP/UDP, Modbus TCP, BCNetTCP transparent
• Client support: Up to ~10 TCP/UDP connections
• Plug‑and‑play: Auto‑detects PLC model and serial settings
• Firmware: Ethernet‑upgradable
• Compatible PLC series: Omron CJ1, CJ2, CS1, NX1P, CG1

Brand or Manufacturer Info
Beichenprovides low-cost Ethernet communication modules for legacy PLCs such as Omron CJ and CP series. Their products focus on simple installation and compatibility for industrial automation digitalization.

Purchase Recommendations
BeiChen：https://www.beichen.store/bcnet-cj/

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