Siemens CPU 948 Programming Manual page 279

Examples
Set system time":
"
You want to set the system time to the following values:
"Thurs, 24.10.1993, 11:30 hours 0 seconds, 24 hour clock"
The time parameters are stored in data block DB 10 from data word DW 0
onwards.
DB 10
0: KH = 0 0 0 0
1: KH = 9 1 3 0
2: KH = 2 4 3 0
3: KH = 9 3 1 0
CPU 948 Programming Guide
C79000-G8576-C848-04
Table 6-12 Error IDs of OB 150 in ACCU-1-L
ID Meaning
9601H Data block not loaded
960FH Multiple call for the block
9611H Illegal function no.
9612H Address area type illegal
9613H Data block number illegal
9614H "Number of first data field word" illegal
9615H Data block length < 4 words
9621H Year specification in the data field illegal
9622H Month specification in the data field illegal
9623H Day of month specification in the data field illegal
9624H Weekday specification in the data field illegal
9625H Hour specification in the data field illegal
9626H Minute specification in the data field illegal
9627H Second specification in the data field illegal
9628H 1/100 seconds in the data field not equal to 0
9629H Hour format not equal to setting in OB 151
Note
If the parameters are incorrectly assigned for the "set system time"
function and if the time has already been set correctly at least
once, the error IDs listed are transferred; the previously set system
time, however, continues to run.
left byte = seconds (BCD), right byte = 0
91 = Format (=80H) + hour (=11 BCD)
30 = Minutes (BCD)
24 = Day of month (BCD)
30 = Weekday (3 = Thursday) + bit 0 to 3 = 0
93 = Year (BCD)
10 = Month (BCD)
OB 150: Set/Read System Time
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