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Error indication
In case of some most common problems WebHMI blinks with LEDs on front panel.
There are three such cases:
Missing SD card or SD card failure
In case of any issue with SD card WebHMI three LEDs will blink slowly: ERR, WWW and VPN. Here is example:
Input power issues
If input power voltage is below normal operational limit four LEDs will blink fast: PWR, ERR, WWW and VPN. Here is example:
Communication issues
If any register can't be read over serial or Ethernet interfaces ERR led will blink,
Here is example of register that can't be read over built-in RS-485 port.
In this example there is no response from PLC over built-in RS-485 port. You can see TX LED blinking when request sent and no RX LED activity. This means that WebHMI does not receive any response on these requests.