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'Floppy disk failure' error is returned when starting the 172CEV20040 Mobus Plus to Ethernet bridge.

Goals and Symptoms

'Floppy disk(s) failed (40)' error is returned when starting the '172CEV20040' Mobus Plus to Ethernet bridge.

Facts and Changes

'172CEV20040' Mobus Plus to Ethernet bridge.

Causes and Fixes

The following error message is displayed on monitor that is connected to the '174VEV20040 Mobus

  • Plus to Ethernet Bridge' after it is turned on.

    Floppy disk(s) failed (40)
    CMOS checksum error - Defaults loaded.
    Warning! CPU has changed
    Please Enter CPU Speed CMOS Setup and Remember to Save Before Exit!

    The message will occur if the battery on the motherboard is fails. When the battery fails, the
    CMOS settings for the BIOS is lost and the motherboard reverts back to the factory default settings.

    Note: 1. This problem will only be noticeable after a power failure.
    2. To prevent this problem from occurring, it is recommended that the battery should be
    replaced every 3 years.

    The following steps can be used to resolve the problem.
  • Obtain a standard replacement battery ('Maxell CR2032 3 volt' or equivalent)
  • Ensure that you are properly grounded using an anti-static strap.
  • Remove the cover by unscrewing the four (4) screws.

  • Unscrew and remove the retaining screw from the metal bracket that is holding the Modbus Plus
Adapter card to the metal case.
  • Remove the Modbus Plus Adapter card.
  • Press down on the battery holder clip to release the battery.

  • Remove the old battery and replace it with the new one.
  • Insert the Modbus Plus Adapter card back into the same slot that it was in.
  • Screw the retaining screw back onto the metal bracket to hold Modbus Plus Adapter card
to the metal case.
  • Place the front cover back onto the metal case.
  • Screw the four (4) cover retaining screws back on.
  • Plug in the power supply, VGA monitor and keyboard.
  • Turn on the bridge
  • Press the 'Del' key to go into the BIOS setup.
  • Select the option named 'Standard CMOS Features'.
  • Hit the 'Enter' key.
  • Scroll down to the option named 'Drive A' using the down arrow key.
  • Hit the 'Enter' key.
  • Select 'None' in the 'Drive A' pop-up window using the up or down arrow keys.
  • Hit the 'Enter' key to accept the changes.
  • Hit the 'Esc' key to return to the main menu.
  • Hit the 'F10' key to save the changes and exit the setup.
  • Type 'y' to answer the question on the window that appears and shows the statement:
' Save to CMOS and EXIT (Y/N) ?'.
  • Hit the 'Enter' key.
  • Power cycle the Ethernet bridge.
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