BECKHOFF EL1904 - Manual (Page 38)

Operation
36 EL1904
4.4.1.3 Diag 3 (red) and Diag 4 (red)
If the Diag 3 LED is lit, the Diag 4 LED indicates internal terminal errors.
Flashing Codes
In the case of such an error, the Diag 4 LED on the EL1904 displays flashing codes that describe the
error in more detail.
A flashing code consists of four sequences, which are interrupted in each case by a short break. After the
four sequences there is a long break, following which the flashing code is displayed again.
Count the individual sequences of the flashing code.
The errors indicated by the following flashing codes are reversible. After successful troubleshooting the
terminal can be restarted.
Diag 3 LED Diag 4 LED
Flashing
Code Meaning Remedy
lit 6-1-1-1 max. internal temperature exceeded Ensure observance of
the permissible ambient
temperature.
7-1-1-1 internal temperature below min. value
2-1-2-1 max. supply voltage µC1 exceeded Check the supply
voltage.
3-1-2-1 max. supply voltage µC2 exceeded
4-1-2-1 voltage fell below min. supply voltage µC1
5-1-2-1 voltage fell below min. supply voltage µC2
8-1-1-1 Temperature difference between the measuring
points exceeded Check the installation
position and the ambient
temperature.
If another flashing code is displayed, this means that there is an internal terminal error that has stopped
the terminal. In this case the terminal must be checked by Automation GmbH & Co. KG.
Note
Note the flashing codes and return the terminal
Note the flashing code displayed and include this information with the terminal when
you return it.