Maintenance
7.2 Resetting the CPU
CPU 1505SP (F) Ready4Linux Version 2.7
Operating Instructions, 05/2019, A5E46864285-AA
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7.2.2 Resetting via the mode switch
Procedure using the mode selector
Make sure that the CPU is in STOP mode (the start page of the CPU web server indicates
STOP mode or RUN/STOP LED lights up yellow).
Note
A memory reset of the CPU via the mode selector also deletes the CPU's IP address.
To reset the CPU memory using the mode selector, follow these steps:
1. Set the mode selector to the STOP position.
Result: The RUN/STOP LED lights up yellow.
2. Set the mode selector to the MRES position. Hold the mode selector in this position until
the RUN/STOP LED lights up for the second time and remains continuously lit (after three
seconds). After this, release the switch.
3. Within the next three seconds, switch the mode selector back to the MRES position, and
then back to STOP again.
Result
The CPU executes the memory reset, while the RUN/STOP LED flashes yellow. When the
RUN/STOP LED lights up yellow, then the CPU has been reset, and is in STOP mode. The
corresponding event is entered in the diagnostics buffer.
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