Siemens CPU 948

System data words
RS 96 to RS 99
Real-time clock
The current date and time of day are kept in system data areas RS 96
to RS 99 and can if necessary be read out from these locations.
15 0
RS 96 Seconds 1/10, 1/100 seconds E F060H
RS 97 Hours Minutes E F061H
RS 98 Day Day of the week E F062H
RS 99 Year Month E F063H
The clock is updated by a 10 msec. pulse.
RS 96 Seconds and 1/100 seconds (address: E F060H):
High byte
Bit no. Assignment
15
Seconds, tens,
permitted: 00H to 05H
14
13
12
11
Seconds, units,
permitted: 00H to 09H
10
9
8
Low byte
7
1/10 second,
permitted: 00H to 09H
6
5
4
3
1/100 second,
permitted: 00H to 09H
2
1
0
Table 8-13 Structure of RS 96 (real-time clock: seconds, 1/100 seconds)
Bit Assignment of the System Data Words
CPU 948 Programming Guide
8 - 32 C79000-G8576-C848-04