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. 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
LEDs
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 Check supply voltage L+.
Off
Supply voltage L+ is present and OK.
On
CHx and COMP LED
Table 5- 3 CHx and COMP status indication
LED CHx/COMP
Channel disabled
Off
Channel configured and OK.
On
Channel is configured (channel error pending).
Diagnostic alarm: e.g. wire break
On
See also
Diagnostics alarms (Page 41)
38
Meaning
Meaning
Meaning
Analog input module AI 8xU/I/RTD/TC ST (6ES7531-7KF00-0AB0)
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 inserted.
•
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Evaluate the diagnostics data and eliminate the
error (e.g., wire break).
Replace the module.
Remedy
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Remedy
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Check the wiring.
Disable diagnostics.
Manual, 09/2016, A5E03484864-AD