Siemens SIMATIC S7-1500 Manual page 26

Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Remedial
measures for diagnostic reports can be found in chapter Diagnostics alarms (Page 27).
RUN and ERROR LED
Table 5- 1 Status and error displays RUN and ERROR
LED
RUN ERROR
Off Off
Flashes Off
On Off
On Flashes
Flashes Flashes
PWR LED
Table 5- 2 PWR status display
LED PWR
Off
On
Analog output module AQ 4xU/I ST (6ES7532-5HD00-0AB0)
Manual, 07/2014, A5E03484696-AC
Meaning
Voltage missing or too low at backplane bus
The module starts and flashes until the valid
parameter assignment is set.
Module is configured
Indicates module errors (at least one error at
one channel, e.g., wire break).
Hardware defective
Meaning
Supply voltage L+ too low or missing
Supply voltage L+ is present and OK
Interrupts/diagnostics alarms
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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Evaluate the diagnostics data and eliminate the
error (e.g., wire break).
Replace the module.
Remedy
Check the supply voltage.
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