Siemens SIMATIC ET 200AL, System Manual

Page: 473 / 2255

Interrupts/diagnostic alarms
5.1 Status and error displays
Digital input/digital output module DIQ 4+DQ 4x24VDC/0.5A 4xM12 (6ES7143-5AF00-0BA0)
22
Equipment Manual, 08/2021, A5E36683613-AB
Meaning of the LEDs
The following tables set out the meaning of the status and error displays. Remedial measures
for diagnostic alarms can be found in the section Diagnostics alarms (Page 23).
DIAG LED
Table 5- 1 Error display of the DIAG LED
DIAG LED Meaning
Off
No supply voltage 1L+
Flashes
• Module parameters not assigned
(after switching on the supply voltage 1L+)
• 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
On
Module parameters assigned and no module diagnostics
Flashes
Module parameters assigned and module diagnostics
LED channel status
Table 5- 2 LED channel status display
LED channel status Meaning
Off
Process signal = 0
On
Process signal = 1
PWR LED
Table 5- 3 Status display of the PWR LED
PWR LED Meaning
Off
Load voltage 2L+ is missing or too low
On
Load voltage 2L+ present