Special functions of a CPU 41x
3.4 Resetting the CPU to the factory state
S7-400 Automation System, CPU Specifications
3-12 Manual, 10/2006, 6ES7498-8AA04-8BA0
LED Patterns during CPU Reset
While you are resetting the CPU to the factory state, the LEDs light up consecutively in the
following LED patterns:
Table 3-2 LED patterns
LED LED pattern 1 LED pattern 2 LED pattern 3
INTF F 0.5 Hz F 0.5 Hz H
EXTF D D D
BUSxF D D D
FORCE F 0.5 Hz D D
IFMxF D D D
RUN F 0.5 Hz D D
STOP F 0.5 Hz D D
D = LED is dark; L = LED lights up; F = LED flashing with the specified frequency
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