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11.8.2 SVCREQ 7 Parameter Block Content: BCD
Format
In BCD format, each time and date item occupies one byte, so the parameter block has six
words.
11.8.2.1 2-Digit Year
The last byte of the sixth word is not used. When setting the date and time, this byte is
ignored; when reading date and time, the function returns 00.
Parameter Block Format:
Example:
High Byte: Low Byte
Read Date and Time in BCD format
(Sun., July 3, 1998, at 2:45:30 p.m.)
1 = change or 0 = read
address
0 (read)
1 (BCD format)
a 1
1 (BCD format)
month
year
a 2
07 (July) 98 (year)
hours
day of month
a 3
14 (hours) 03 (day)
seconds minutes a 4
30
(seconds)
45 (minutes)
(null) day of week
a 5 0
06 (Friday)
11.8.2.2 4-Digit Year
The parameter block has six words. All bytes are used.
Parameter Block Format:
Example:
High Byte: Low Byte
Read Date and Time in BCD format
(Sun., July 3, 1998, at 2:45:30 p.m.)
1 = change or 0 = read
address 0
00 (read)
81h (BCD format, 4-digit)
a 1 0
81h (BCD, 4-digit)
year year
a 2
19 (year) 98 (year)
day of
month
month a 3
03 (day) 07 (July)
minutes hours a 4
45 (minutes) 14 (hours)
day of week
seconds a 5
06 (Friday) 30 (seconds)
206 GFK-1503E VersaMax PLC User Manual
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