Diagnostics; Diagnostic Leds - Beckhoff EL1904 Operating Instructions Manual

Operation
5.5

Diagnostics

5.5.1

Diagnostic LEDs

The LEDs Diag 1 to Diag 4 display diagnostic information for the EL1904.
5.5.1.1 Diag 1 (green)
The Diag 1 LED indicates the state of the TwinSAFE interface.
Flashing Code
LED illuminated continuously
rapid flickering, alternating with 1 flash pulse
rapid flickering, alternating with 2 flash pulses
rapid flickering, alternating with 3 flash pulses
rapid flickering, alternating with 4 flash pulses
rapid flickering, alternating with 5 flash pulses
rapid flickering, alternating with 6 flash pulses
rapid flickering, alternating with 7 flash pulses
rapid flickering, alternating with 8 flash pulses
5.5.1.2 Diag 2 (red)
The Diag 2 LED illuminates red if the terminal detects an external supply or cross-circuit. The LED
extinguishes once the error is rectified.
5.5.1.3 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.
46
Meaning
normal operation:
TwinSAFE communication OK
Error in S parameter (TwinSAFE parameter)
Error in I parameter (Individual parameter)
Waiting for S and I parameter
S- and I-parameter correct:
waiting for first host message
Watchdog error
CRC error
Sequence number error
Communication error in the TwinSAFE protocol
Version: 3.0.0 EL1904