Siemens SIMATIC ET 200AL Equipment Manual page 20

Meaning of the LEDs
The following tables set out the meaning of the status and error displays. Corrective
measures for diagnostics alarms can be found in section Diagnostics alarms (Page 20).
DIAG LED
Table 5- 1
LED channel status
Table 5- 2
LED channel status
DI 8x24VDC 4xM12 (6ES7141-5AF00-0BA0)
Equipment Manual, 08/2021, A5E36680963-AB
Error display of the DIAG LED
DIAG LED Meaning
No supply voltage 1L+
Off
• Module parameters not assigned
(after switching on the supply voltage 1L+)
Flashes
• Loading firmware
(while the firmware update is being performed, all LEDs retain their cur-
rent status)
• No connection to the ET-Connection and/or the fieldbus
Module parameters assigned and no module diagnostics
On
Module parameters assigned and module diagnostics
Flashes
LED channel status display
Meaning
Process signal = 0
Off
Process signal = 1
On
Interrupts/diagnostic alarms
5.1 Status and error displays
19