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Meter Clock Configuration ION 7500 / ION 7600 User’s Guide
Page 62 Chapter 3 - Default Meter Functionality
Meter Clock Configuration
The Clock module controls the meter’s internal clock, which provides timestamps
for data logged by the device. The clock needs to be configured properly to ensure
that logged data has accurate timestamp information. The Clock module also
receives the time synchronization signals sent to it by the workstation running
ION software, updating the device’s clock when required.
The Clock module’s Clock Source setup register defines how the meter’s internal
clock auto-corrects drift from its internally calculated time. A separate time source
(such as a GPS receiver, or a DNP Master) can be used to synchronize the clock
through a communications channel. By default, the clock is set to synchronize from
the line frequency.
The setup registers in the Clock module specify timezone and Daylight Savings
Time (DST) parameters and time synchronization functions.
TIP
When modifying setup registers of the Clock module in Designer, use the Format option to convert
between UNIX and conventional time. Refer to the description of the Clock module in the online ION
Programmer’s Reference for more details.
Typically, the DST Start and DST End registers do not have to be reconfigured. The
factory defaults are the DST start and end dates for 20 years, in UNIX time (the
number of seconds since 00:00:00 UTC on Jan 1, 1970).
Refer to the technical note Time Synchronization and Timekeeping for further details
on using the meter’s time synchronization functions.
Setup Register Function Default
TZ Offset Sets the timezone the device is in, relative to Greenwich Mean Time. 0
DST Start 1 …
DST Start 20
The date and time when DST begins for 20 separate years.
Refer to the
ION Device Templates
at www.pwrm.com for the DST Start
and DST End defaults for the twenty
separate years.
DST End …
DST End 20
The date and time when DST ends for 20 separate years.
DST Offset The amount of time the clock is changed when DST begins or ends. 3, 600 seconds
Time Sync Source Specifies the communications port that receives time sync signals. COM1
Time Sync Type Specifies the type of time sync signal (Local or Universal time). UTC
Clock Source
Specifies the clock’s time synchronization signal source (line frequency,
communications signals, or internal crystal).
Line Frequency