Technical data

Table Of Contents
System Status Lists (SSL)
System Software for S7-300/400 System and Standard Functions - Volume 2/2
A5E00739858-01
33-29
Status
Bit Default Value Description
15 0 Sign for the correction value
(0: positive, 1: negative)
14 to 10 00000 Correction value
This parameter allows the basic time in the frame to be corrected to
local time:
Local time = basic time
± correction value * 0.5 h
This correction takes into account the time zone and the time
difference in summer time (daylight savings time) and winter time
(standard time).
9 0 Reserved
8 0 Reserved
7 0 Notification hour
This parameter indicates whether the next time adjustment also
includes a switchover from summer (daylight savings time) to winter
time (standard time) or vice versa.
(0: no adjustment made, 1: adjustment made).
6 0 Summer (daylight savings time)/winter time (standard time) indicator
The parameter indicates whether the local time calculated using the
correction value is summer or winter time.
(0: winter time, 1: summer time)
5 0 Parameter not used by S7.
4 to 3 00 Time resolution
This parameter indicates the resolution of the transmitted clock time.
(00: 0.001 s, 01: 0.01 s, 10: 0.1 s, 11: 1 s)
2 0 Parameter not used by S7.
1 0 Parameter not used by S7.
0 0 Synchronization failure
This parameter indicates whether the time transmitted in the frame
from an external time master (e.g. SICLOCK) is synchronized
(0: synchronization failed, 1: synchronization occurred)
Note:
Evaluation of this bit in a CPU is only meaningful if there is continuous
external time synchronization.