Siemens SIMATIC S7-1500 Manual page 38

Interrupts/diagnostics alarms
5.1 Status and error displays
Meaning of the LED displays
The following tables explain the meaning of the status and error displays. Corrective
measures for diagnostics alarms can be found in the section Diagnostics alarms (Page 41).
LED RUN/ERROR
Table 5- 1 RUN/ERROR status and error displays
LEDs
RUN ERROR
Voltage missing or too low at backplane bus.
Off Off
The module starts and flashes until the valid
configuration 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
CHx LED
Table 5- 3 CHx status display
LED CHx
Channel disabled.
Off
Channel configured and OK.
On
Channel is configured (channel error pending).
Diagnostics alarm: e.g. wire break
On
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Meaning
Meaning
Meaning
Analog Input Module AI 4xU/I/RTD/TC ST (6ES7531-7QD00-0AB0)
Solution
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.
Solution
Check supply voltage L+.
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Solution
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Check the wiring
Disable diagnostics.
Manual, 09/2016, A5E32366209-AC