Siemens SIMATIC S7-1500 Manual page 28

Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Remedial
measures for diagnostic alarms can be found in section Diagnostic alarms.
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LED
RUN ERROR
Voltage missing or too low at backplane bus.
Off Off
The module starts and flashes until the valid
parameter assignment is set.
Flashes Off
Module is configured.
On Off
Indicates module errors (at least one error at
one channel, e.g., wire break).
On Flashes
Hardware defective.
Flashes Flashes
PWR LED
Table 5- 2 PWR status display
LED PWR
Supply voltage L+ to module too low or missing
Off
Supply voltage L+ is present and OK.
On
Analog Input Module AI 8xU/I HS (6ES7531-7NF10-0AB0)
Manual, 07/2014, A5E03484886-AC
Meaning
Meaning
Interrupts/diagnostics alarms
5.1 Status and error displays
Remedy
Switch on the CPU and/or the system power
•
supply modules.
Verify that the U connectors are inserted.
•
Check to see if too many modules are insert-
•
ed.
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Evaluate the diagnostics data and eliminate the
error (e.g., wire break).
Replace the module.
Remedy
Check supply voltage L+.
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