II-168
WSM Minor Change II Service Engineering Section
2. Fail record in EEPROM
If the sensor or actuator line has an error, the output of the actuator will stop and the LCD will display the
contents of the error while the error point is written to the EEPROM. Fig. 2 and fig. 3 show the address allo-
cation of the EEPROM.
2-1 Error Storage Method
If an error result, data in a corresponding EEPROM address will be overwritten. The data in the correspond-
ing address has a capacity of 2 x 16 bits. The first address (1 x 16 bits) has an hour meter record for the lat-
est error. The other address (1 x 16 bits) has an hour meter record of the first error along with the total
number of errors in the past. The data will be written to the EEPROM after rounding off all hour meter values
for less than one hour (see fig.1).
Hour meter data and the number of errors (1) will be written to both addresses if an error occurs for the first
time. The last hour meter data will be converted into present hour meter data for errors on and after the sec-
ond time. The count will remain 15 regardless of whether the actual number of errors exceeds 15, and only
data on the last hour meter data will be overwritten.
Fig. 1 Error Data Storage Method
2-2 Number of Errors
Data is stored in four bits. Therefore, the maximum number of errors is limited to 15. The count increases by
one if an error occurs after the key is turned ON. Once the key is turned ON, however, the count increases
only by one until the key is turned OFF.
(Example) Binary to decimal
:
0 A A 7
0 A A 7H
Address sample (Fig. ___ shows address numbers 85 to 103)
Address sample (Fig. ___ shows address numbers 65 to 83)
1 0 1 0 1 0 1 0 Binary
+1 x 2
7
= 128
(decimal) 170 hrs
0 x 2
6
=0
1 x 2
5
=32
0 x 2
4
=0
1 x 2
3
=8
0 x 2
2
=0
1 x 2
1
=2
0 x 2
0
=0
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