Reboot (Warm Restart); Operation Sequence For Reboot/Warm Start; Operating Sequence At Cold Restart - Siemens SIMATIC S7-400H Manual

Installation of a CPU 41x-H

Reboot (Warm Restart)

Following a reboot, the user program is restarted from the beginning. The retentive
data and the contents of the data blocks are retained.

Operation Sequence for Reboot/Warm Start

1. Turn the switch to the STOP setting.
Result: The STOP LED lights up.
2. Turn the switch to the RUN/RUNP position.

Operating Sequence at Cold Restart

1. Turn the switch to the STOP setting.
Result: The STOP LED lights up.
2. Turn the switch to MRES, and keep it in this position.
Result: The STOP LED is dark for a second, light for a second, dark for a
second and then remains on.
3. Turn the switch to the RUN/RUNP position.
4-14
Automation System S7-400H Fault-tolerant Systems
A5E00068197-07