OMRON FH/FHV series visual sensor controller

Common fault codes and quick troubleshooting

The following table summarizes the most common errors encountered on site and their solutions:

Possible causes and solutions for error messages

The error concerning connection of camera was detected.  Poor contact of camera cables, failure to use designated brackets (resulting in internal circuit grounding), cables exceeding the specified length, inspection of connections to ensure isolation using metal brackets, and replacement of high-quality cables. Click on 'Detail' to view the specific camera channel status (CLK/LVAL/DMA).

Failed to start the window. Memory is insufficient. Out of memory, the model or measurement area is too large, the model registration area is reduced, the number of labels is reduced, or the scene group is saved to external storage.

Logging error: Check if the USB/SD card is recognized (using the Device Information Storage Tool to pre store device information) or clear the RAMDisk if the target is out of space or unrecognized.

PLC link error communication parameter mismatch, cable fault confirmation station number, baud rate, data format consistent with PLC; Check the terminal resistance.

The camera connected is not the same as the one used for the last save. Changing the camera model or loading old scene data to save the scene data again; If switching to a different resolution camera, it is necessary to adjust the camera model settings of all image input units.

Fan/voltage error. Check the ventilation port for fan stalling or 24V power fluctuation, and measure whether the voltage is within the range of 20.4~28.8V.

Advanced Techniques: Variables and Custom Dialogs

1. Scene variables and system variables

Scenario variable: Only valid in the current scenario, suitable for temporary calculation of data.

System variables: Can be accessed across scenes and scene groups, but cannot be accessed across lines in multi line mode.

When defining variables in the TDM editor, integer, real, string, and array types are supported, and the "Save" suffix (such as&&) can be selected to preserve variable values after power failure. Variable naming convention: The first character must be a letter, case insensitive, and reserved characters are disabled.

2. Custom dialog box

For on-site operators, a simplified settings interface can be created, exposing only necessary parameters such as thresholds and area sizes. In Window → Custom dialog settings, select Normal dialog and drag and drop numerical boxes, buttons, and other controls to associate with the external reference data number of the specific processing unit. After saving, call through Tool → Custom dialog. This feature can significantly reduce the risk of misoperation.