Test the connection to the PLC

Check whether the communication with the control device (PLC) can be established.

Before you can test the connection, you must enable the COM interface on the “COM Interface” page (e.g. to test RS232, enable “COM1 RS232”) and configure a redirect to a TCP port (see "Related topics").

You can only test MEWTOCOL and MEWTOCOL7 connections (Modbus connections cannot be tested). You cannot test connections for COM4 Ethernet.

  1. Open the “Port” page and go to the “Test connection to PLC” section.
  2. Select the desired button.

    If the button is disabled, make sure the COM interface is enabled and a port has been opened.

    • “Test RS232”: Test the connection between COM1 RS232 of the FP-I4C unit and the control device (PLC).

    • “Test RS485”: Test the connection between COM2 RS232/RS485 of the FP-I4C unit and the control device (PLC).

      Depending on the “Mode” setting on the “COM Interface” page, COM2 can be an RS232 or RS485 interface.

    • “Test USB”: Test the connection between COM3 USB of the FP-I4C unit and the control device (PLC).

      The FP-I4C unit has two USB slots, but you can connect only one PLC to the USB interface. We recommend to use the bottom slot, because the top slot provides a current of 500mA that may be useful for other devices.

Possible results when testing a connection:
Related topics: