Diagnostics; Status And Error Displays - Siemens SIMATIC S7-1500 Manual

Diagnostics

7.1

Status and error displays

The diagnostic information provided by the status LEDs of the module represents an initial aid
in limiting errors. To identify the error more precisely, the display of the CPU, the module
status information indicated in STEP 7 or the diagnostic buffer of the CPU can be evaluated.
There you will find plain text information about the error that occurred and the number of
the matching error OB.
You can find more information on the status bytes in section Address space and address
assignment (Page 27).
LED display
The figure below shows the LED displays of the TM NPU:
①
②
③
④
⑤
Technology Module TM NPU
Equipment Manual, 07/2023, A5E46384784-AC
RUN LED (green)
ERROR LED (red)
MAINT LED (yellow)
LINK LED (green)
PWR LED (green)
7
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