Interface module IM 155-5 MF HF (6ES7155-5MU00-0CN0)
46 Equipment Manual, 11/2023, A5E53268530-AA
Interrupts and diagnostic, error, and system
alarms
6.1 Status and error displays
Introduction
Diagnostics by means of LED display is an initial tool for error localization. To narrow down
the error, you usually evaluate the display of the CPU, the display of the module status in
STEP 7 or the diagnostics buffer of the CPU. The buffer contains plain text information on the
error that has occurred. For example, you will find the number of the appropriate error OB
there.
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