Siemens Simatic S7-1500 Manual page 19

Meaning of the LED displays
The following table explains the meaning of the status and error displays.
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LED
RUN ERROR
Off Off
Off
Flashes
On Off
Flashes Flashes
CHx LED
Table 5- 2 CHx status display
LED CHx
Off
On
Digital output module DQ 8x230VAC/2A ST Triac (6ES7522-5FF00-0AB0)
Manual, 09/2016, A5E03485733-AD
Meaning
Voltage missing or too low at backplane bus
The module starts and flashes until the valid
parameter assignment is set.
Module is configured
Hardware defective
Meaning
0 = Status of the output signal
1 = Status of the output signal
5.1 Status and error displays
Remedy
Switch on the CPU and/or the system pow-
•
er supply modules.
Verify that the U connectors are inserted.
•
Check to see if too many modules are in-
•
serted.
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Replace the module.
Remedy
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Diagnostic alarms
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