BCNet‑S7300 Ethernet Gateway for Siemens PLCs

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High‑speed Ethernet processor for Siemens S7‑200/300/400 and CNC 840D/840DSL, ideal for industrial data acquisition and protocol conversion.

Product Overview
The BCNet‑S7300 is an industrial communication module that converts Siemens PPI/MPI/DP ports to Ethernet protocols (S7‑TCP, Modbus TCP). It supports Siemens S7‑200/SMART, S7‑300, S7‑400 PLCs and CNC 840D/840DSL controllers. Key features include reliable dual‑port communication, plug‑and‑play integration, and compatibility with multi-master MPI/DP networks. It streamlines remote monitoring, data logging, and HMI connectivity, reducing cabling and improving network flexibility

How to Use

  1. Mount the BCNet‑S7300 on a DIN rail near your PLC or CNC controller.
  2. Connect the PPI/MPI or DP port on the PLC/CNC to the BCNet’s serial port using a standard 9‑pin cable.
  3. If powering a CNC 840DSL, provide an external 24 VDC supply to the module.
  4. Configure IP address, subnet mask, and protocol settings via the built‑in web interface or configuration software.
  5. On your SCADA/HMI or PC, point your S7‑TCP or Modbus TCP client to the module’s IP.
    Tips: Reserve unique MPI addresses to avoid bus conflicts. Ensure firmware is up to date for best compatibility. Observe proper grounding and isolation to protect against industrial noise

Frequently Asked Questions (FAQ)

  1. What protocols does BCNet‑S7300 support?
    S7‑TCP and Modbus TCP over Ethernet.
  2. Which Siemens PLCs are compatible?
    S7‑200/SMART, S7‑300, S7‑400 and CNC 840D/840DSL.
  3. Does it need external power?
    Yes, for models connected to CNC 840DSL you must supply 24 VDC.
  4. Can it act as multi‑master on MPI/DP?
    Yes, it supports multi‑master communication on MPI/DP networks.
  5. How do I configure the IP?
    Via the module’s built‑in web server or dedicated PC software.
  6. What cable is required?
    Standard Siemens MPI or DP 9‑pin shielded serial cable.
  7. Is firmware upgradable?
    Yes, through the web interface or configuration utility.
  8. What’s the typical latency?
    Industrial‑grade, low latency suitable for control loops (milliseconds).
  9. Can I connect multiple HMIs?
    Yes, multiple TCP clients can poll data concurrently.
  10. What environment ratings?
    Industrial temperature range and EMI protection typical of Beichen modules.

User Review Summary
On eBay, buyers praised fast shipping from China, secure packaging, and item matching description. One user said “Item works as advertised, at a reasonable price, and it is in mint condition” and another highlighted “super-fast shipping and handling. 4 days total from China to USA”Common cons: potential customs delays and import duties.

Comparison with Competing Products
BCNet‑S7300 vs. BCNet‑S7300‑S (Amazon)
• Protocols: both support S7‑TCP/Modbus TCP; S‑S adds PROFIBUS support.
• Price: BCNet‑S7300 ~$190–202 USD; BCNet‑S7300‑S ~ $492 USD.
• Use case: choose S‑S if you need PROFIBUS DP in addition to Ethernet.

Technical Specifications
Model: BCNet‑S7300
Protocols: MPI, PPI, Profibus DP (select models), S7‑TCP, Modbus TCP
Ports: 1×9‑pin MPI/PPI/DP serial, 1×RJ45 Ethernet 10/100 Mbps
Power: 24 VDC (external for CNC models)
Dimensions: DIN‑rail mountable housing (approx. 22.5 × 100 × 114 mm)
Temperature: –20 to +60 °C operating
Memory/CPU: industrial microcontroller for protocol conversion
LEDs: status indicators for power, link, activity

Brand or Manufacturer Info
Beichen specializes in industrial Ethernet communication solutions. Their BCNet series is recognized for robustness, ease of integration, and broad Siemens compatibility, serving factories worldwide with cost‑effective gateway modules.

Purchase Recommendations
Beichen: https://www.beichen.store/bcnet-s7300/

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