• No : 4569
  • Displayed Date : 2025/12/01 13:46
  • Updated DTM : 2025/12/08 11:49
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A TCP connection cannot be established.

A TCP connection cannot be established.

Category : 

Answer

This error occurs when a TCP connection cannot be established when connecting to a network device using TCP/IP.

 

<Cause>

  1. The LAN cable is not connected correctly.
    Or power to the connected device is not turned on.
  2. Communication settings (IP address, port number, etc.) on the V series
    do not match those of the connected device.

 

<Solutions>

Case A
  • Determine the line status by conducting a network test.
    For information on network testing, click here.
  • Turn power to the connected device off and on again.
Case B
  • Check that the [Maker], [Model], and [Target Port No.] settings of the connected device are configured correctly in the screen program.
  • Check that the IP address, port number, and other communication settings match on both the connected device and the V10/V9 series unit.

 

Example) MICREX-SX (Ethernet)

 

How to check the manufacturer and model of the connected device:
Double-click on [PLC Setting] located at [System Setting] → [Hardware Setting].




How to check the communication settings:
Click [System Setting] → [Hardware Setting] → [PLC Properties] → [PLC Table] → [Setting].

 * If the [Restore Screen Data Settings] switch is displayed in Local mode on the V10/V9 series unit under [LAN Setting] → [Comm. Setting], press the switch and then press the [Apply] switch at the lower right of the screen.

 

For information on settings for Fuji Electric's MICREX-SX, click here.