Siemens Simatic S7 Series System Manual page 169

T byte Description
15
16
17
18
The following bytes 9-20 are used only for correction mode = EEH (extended user assigned)
9
10
11
12
13
14
15
16
17
18
19
20
EU convention: Adjust time ahead one hour on last Sunday in March at 1:00 a.m. UTC. Adjust
1
time back one hour on last Sunday in October at 2:00 a.m. UTC. (The local time when the correc-
tion is made depends upon the time zone offset from UTC).
US convention: 2007 standard - Adjust time ahead one hour on second Sunday in March at 2:00
2
a.m. local time. Adjust time back one hour on first Sunday in November at 2:00 a.m. local time.
Australia convention: 2007 standard - Adjust time ahead one hour on first Sunday in October at
3
2:00 a.m. local time. Adjust time back one hour on first Sunday in April at 2:00 a.m. local time (also
for Australia - Tasmania).
New Zealand convention: 2007 standard - Adjust time ahead one hour on last Sunday in Septem-
4
ber at 2:00 a.m. local time. Adjust time back one hour on first Sunday in April at 2:00 a.m. local
time.
To assign the last occurrence of the weekday in the month (for example, the last Monday in April),
5
set the week = 5.
Extended power outage effect on the CPU clock
See the S7-200 SMART system manual appendix A CPU specifications, for how long the
real-time clock can maintain the correct time during power outages.
A CPU initializes with the time values shown in the following table, after an extended power
outage.
Date
01-Jan-2000
S7-200 SMART
System Manual, 09/2015, A5E03822230-AC
DST ending month
DST ending day
DST ending hour
DST ending minute
DST correction hours
DST correction minutes
DST beginning month
DST beginning week
DST beginning weekday
DST beginning hour
DST beginning minute
DST ending month
DST ending week
DST ending weekday
DST ending hour
DST ending minute
Time
00:00:00
Data value
1 to 12 (BCD value)
1 to 31 (BCD value)
0 to 23 (BCD value)
0 to 59 (BCD value)
0 to 23 (BCD value)
0 to 59 (BCD value)
1 to 12 (BCD value)
1 to 5 (BCD value)
5
1 to 7 (BCD value)
0 to 23 (BCD value)
0 to 59 (BCD value)
1 to 12 (BCD value)
1 to 5 (BCD value)
5
1 to 7 (BCD value)
0 to 23 (BCD value)
0 to 59 (BCD value)
Day of week
Saturday
Program instructions
7.2 Clock
169