116 HB700 | CPU | PMC921xEx | en | 24-04
Deployment CPU iC921xM-FSoE
Commissioning > Notes on commissioning
WARNING
Safety function only ensured after validation
− The planned safety function of the plant/machine is only ensured after
validation.
WARNING
Organizational or technical measures required for compensation of the CRC
checksum
T
ake technical or organisational measures to ensure that the correct project
for the application is started in the CPU by comparing the CRC checksum:
⮫‘Comparison of the checksums’...page 123
− After transferring a project to the CPU.
− A valid but incorrect project for the application could be loaded.
− After removing the SD card.
− There could be a valid project in the internal memory but the incorrect
one for the application.
− After inserting or changing the SD card.
− There could be a valid project on the SD card but the incorrect one for
the application.
If you use a technical measure to check the CRC checksum, it must be
implemented in such a way that the check done by a third technical instance
outside the safety CPU.
WARNING
Safety and availability of the plant/machine
− Ensure the safety and availability of your plant/machine by selecting the
appropriate watchdog time FSoE_WD_T
ime.
− Select the watchdog time high enough so that the safety of your plant/
machine is still guaranteed with the highest possible availability
.
WARNING
Avoid danger caused by triggering the safety function too late
− Ensure that the maximum permissible values TI
FSoEWD_MAX
and
T
O
FSoEWD_MAX
are not exceeded. ⮫‘Maximum permitted watchdog
times’...page 134
WARNING
Debug operation
− Switching to debug operation means leaving normal operation.
− Make sure that your plant/machine does not pose any danger to people
during debug operation and that no damage can be caused.
NOTICE
Acclimatization before start-up
Make sure that commissioning only takes place after the CPU and the associ-
ated modules have acclimatized!
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