Rockwell Automation 865 Differential Protection Relay - Manual (Page 105)

Supporting Functions 4-13
865-UM001A-EN-P – July 2009
Table 4.9 – System Clock Parameters
Parameter Value Unit Description Note
Date Current date Set
Time Current time Set
Style
Y–d–m
d.m.y
m/d/y
Date format
Year-Month-Day
Day.Month.Year
Month/Day/Year
Set
SyncDI
–
DI1 ... DI6
The digital input used for clock
synchronisation.
DI not used for synchronizing
Minute pulse input
TZone –12.00 ... +14.00 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 Set
DST No
Yes
Daylight saving time for SNTP Set
SySrc
Internal
DI
SNTP
SpaBus
ModBus
ProfibusDP
IEC-103
DNP3
Clock synchronisation source
No sync recognized since 200 s
Digital input
Protocol sync
Protocol sync
Protocol sync
Protocol sync
Protocol sync
Protocol sync
MsgCnt 0 ... 65535, 0 ...
etc. The number of received synchronisation
messages or pulses
Dev ±32767 ms Latest time deviation between the system
clock and the received synchronization
SyOS ±10000.000 s Synchronisation correction for any constant
error in the synchronizing source.
A positive value will compensate a lagging
external sync and communication delays. A
negative value will compensate any leading
offset of the external synch source. Set
AAIntv ±10000 s Adapted auto adjust interval for 1 ms
correction Set
AvDrft Lead
Lag
Adapted average clock drift sign Set
FilDev ±125 ms Filtered synchronisation deviation
Set = An editable parameter (password needed)
Astronomically a range –11 ... +12 h would be enough, but for political and geographical reasons a
larger range is needed.
If external synchronization is used this parameter will be set automatically.
Set the DI delay to its minimum and the polarity such that the leading edge is the synchronizing
edge.
System Clock
Parameters