Siemens simatic c7-621 Hardware Installation Manual page 40

Installing and Preparing the C7
4. Select the STOP function by pressing
5. Select the MRES (Memory Reset) function by pressing
6. Immediately after the STOP LED lights up again:
7. Following the memory reset, you must set the C7 CPU explicitly to STOP
Note
A memory reset does not affect the content of the C7 CPU flash memory.
How to delete the content of the flash memory is described in Volume 2,
Section 3.8.
2-22
The following menu is displayed.
MODE:STOP
RUNP RUN STOP MRES
SF DC5V
FRCE
Figure 2-18 "C7 CPU Modes" Menu with Function Keys
The STOP LED lights up.
until the STOP LED goes off twice.
Select STOP and immediately afterwards MRES (within 1 second). If
there is more than 1 second between pressing the two keys, the memory
reset is not performed.
Result:
– When the STOP LED flashes quickly for approximately 3 seconds and
is then lit continuously again, the memory on the C7 CPU has been
reset.
– If the STOP LED of the C7 lights up without first flashing, then repeat
Steps 4 and 5.
or RUN/RUNP otherwise the C7 CPU is still set to MRES.
= Anwahl der
DIR–Funktion
RUN
LED displays
STOP
.
and wait
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01