Commissioning
S7-300 Programmable Controller Hardware and Installation
A5E00105492-01
8-17
t
On
STOP-
LED
Off
3s
max. 3 s
3s
On
RUN-
LED
Off
1
2
3
Figure 8-9 Sequence of operation for cold start with the mode selector switch (CPU 318-2DP only)
What happens in the CPU during memory reset?
Table 8-5 Internal CPU events on memory reset
Event CPU 313 / 314 / 314 IFM (314-5AE10) / 315 / 31x-2 DP /
CPU 31xC
CPU 312 IFM /
314 IFM (314-5AE0x)
1. The CPU deletes the complete user program in main memory and RAM load
memory.
2. The CPU deletes the retentive data.
3. The CPU tests its own hardware.
CPU activities
4. If a Memory Card or an MMC is inserted, the CPU
copies its runtime relevant data to main memory.
Tip: If the CPU cannot copy the data on Memory Card
or MMC and requests memory reset:
• Remove the Memory Card or MMC
• Resetting CPU memory
• Read the diagnostic buffer.
The CPU copies
runtime relevant data
from EPROM memory
to main memory
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