Table 6- 3 Led Patterns - Siemens SIMATIC S7-400H System Manual

Fault-tolerant systems

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Special functions of a CPU 41x-H

6.3 Resetting the CPU to the factory state

LED patterns during CPU reset

While you are resetting the CPU to its factory settings, the LEDs light up consecutively in the

following LED patterns:

LED patterns

LED pattern 1

Flashes at 0.5 Hz

Flashes at 0.5 Hz

Flashes at 0.5 Hz

LED pattern 2

Flashes at 0.5 Hz

System Manual, 03/2012, A5E00267695-11

LED pattern 3