Siemens SIMATIC ET 200L - Diagnostics Using the LED Display

5-2
ET 200L Distributed I/O Device
EWA-4NEB 780600902-05
5.1 Diagnostics Using the LEDs
The ET 200L distributed I/O device features the following diagnostic op-
tions:
S LEDs
S Slave diagnostics (refer to Section 5.2)
Each input and output of the ET 200L distributed I/O device has a status dis-
play. The status display LED lights up when the input or output is active.
The ET 200L distributed I/O device has two LEDs for displaying statuses.
Table 5-1 Diagnostics Using the LED Display
BF LED
(Bus Fault)
ON LED
Meaning Error Handling
Off Off S No voltage is being applied to
the ET 200L.
S An ET 200L hardware fault has
occurred.
S Check the power supply.
Switch on the on-off switch for
24 VDC on the power supply
module.
S Check whether the electronics
block is properly secured on the
terminal block.
On On S ET 200L is in the process of
startin up.
S A modified PROFIBUS address
is only effective following
POWER–OFF/POWER–ON.
–
–
S The connection to the DP mas-
ter has failed.
S ET 200L has still not received
any configuration data.
S Check the PROFIBUS connec-
tion.
S Check the DP master.
S Check the configuration in the
DP master (station type, input/
output, PROFIBUS address).
S Check which PROFIBUS ad-
dress has been set.
Off On Data exchange –
Introduction
Status Display
ET 200L LED Dis-
play
Diagnostics
Diagnostics