Service Manual for FNDX 5
08/2009 FR
Page 17
12.1.3
THE BEFORE MENTIONED VALUES ARE DEFINED AS FOLLOWING
EEPROM CRC CHECK
The setup, standby options, and the three programs are stored in EEPROM residing on the PDB. To ensure
the data validity in this EEPROM, a CRC is used.It is almost impossible that the software recognizes a new
EEPROM containing random data, as a valid one.
The program startup follows this sequence:
#
Checks the setup data CRC. If not valid, an error message "Setup Invalid" appears and you are taken
to
the programming menu. If the CRC is OK, program continues further.
#
Next, the Standby options CRC is checked. If invalid you get “Options invalid” and proceed to
programming mode.
#
Next, Program 1 CRC is checked. If invalid you get "Program1" and proceed to programming mode.
Only if all of the above is OK, the processor will run in work mode.
Note that P2 ..... P9 are not required
to be valid, just P1. However, if P2 ..... P9 has invalid CRC, when attempting to switch to that program,
you'll get an error message "Program invalid".
Sensor
point "0"
T1 Str
T1 End
T2 End
T3 End
Wat End
Dry End
DE
VE
LO
PE
R
FI
XER
W
ASH
DR
YER
Wat Str
Level