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With these parameter values the system clock corrects itself with –1
ms every 9.9 seconds which equals –61.091 s/week.
Example 2
If there is no external sync and the device's clock has been lagging
five seconds in nine days and the AAIntv has been 9.9 s, leading,
then the parameters are set as
=
AAIntv
NEW
1
−
9
9 .
9
AvDrft =
Lead
NOTE: When the internal time is roughly correct – deviation is less
than four seconds – any synchronizing or auto-adjust will never turn
the clock backwards. Instead, in case the clock is leading, it is softly
slowed down to maintain causality.
Table 4.16 – System Clock Parameters
Parameter
Value
Date
Time
Style
y d m
d.m.y
m/d/y
SyncDI
–
DI1 ... DI6
TZone
–12.00 ...
+14.00
DST
No
Yes
SySrc
Internal
DI
SNTP
SpaBus
ModBus
ProfibusDP
IEC-103
IEC-101
DNP3
MsgCnt
0 ... 65535, 0
... etc.
Supporting Functions
1
=
10
6 .
5000
⋅
⋅
24
3600
Unit
Description
Current date
Current time
Date format
Year-Month-Day
Day.Month.Year
Month/Day/Year
The digital input used for clock
synchronization.
DI not used for synchronizing
Minute pulse input
UTC time zone for SNTP
synchronization.
Note: This is a decimal number. For
example for state of Nepal the time
zone 5:45 is given as 5.75
Daylight saving time for SNTP
Clock synchronization source
No sync recognized since 200 s
Digital input
Protocol sync
Protocol sync
Protocol sync
Protocol sync
Protocol sync
Protocol sync
The number of received
synchronization messages or pulses
4-21
Note
Set
Set
Set
Set
Set
857-UM001A-EN-P – July 2009
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