Basler Electric DECS-250N - Manual (Page 199)

9440500990 Rev D 183
DECS-250N Timekeeping
Timekeeping
The DECS-250N clock is used by the logging functions to timestamp events. DECS-250N timekeeping
can be self-managed by the internal clock or coordinated with an external source through a network or
IRIG device.
BESTCOMSPlus ® Timekeeping settings are shown in Figure 158.
BESTCOMSPlus Navigation Path: Settings Explorer, General Settings, Clock Setup
HMI Navigation Path: Settings, General Settings, Clock Setup
Time and Date Format
Clock display settings enable you to configure the time and date reported by the DECS-250N to match
the conventions used in your organization/facility. The reported time can be configured for either the 12-
or 24-hour format
A with the Time Format setting. The Date Format setting A configures the reported date
for one of three available formats: MM-DD-YYYY, DD-MM-YYYY, or YYYY-MM-DD.
Daylight Saving Time Adjustments
The DECS-250N can automatically compensate for the start and end of daylight saving time (DST) on a
fixed- or floating-date basis
B . A fixed-date, for example, is March 2, and an example of a floating-date is,
“Second Sunday of March”. DST compensation can be made in respect to your local time or coordinated
universal time (UTC)
C . DST start D and end E points are fully configurable and include a bias adjustment F .
Network Time Protocol (NTP)
When connected to an Ethernet network, the DECS-250N can use NTP to assure accurate, synchronized
timekeeping. By synchronizing with a radio, atomic, or other clock located on the internet/intranet, each
DECS-250N maintains accurate timekeeping that is coordinated with the time source.
NTP Settings
NTP is enabled in the DECS-250N by entering the internet protocol (IP) address of the network
timeserver in the four decimal-separated fields of the NTP Address setting
G . Time zone offset settings H
provide the necessary offset from the coordinated universal time (UTC) standard. Central standard time is
six hours and zero minutes behind (–6, 0) UTC and is the default setting.
The Time Priority Setup must be used to enable a connected time source. When multiple time sources
are connected, the Time Priority Setup
I can be used to rank the sources according to their priority.
IRIG
When the IRIG source is enabled, through the Time Priority Setup, it begins synchronizing the
DECS-250N internal clock with the time code signal.
Some older IRIG receivers may use a time code signal compatible with IRIG standard 200-98, format
B002, which does not contain year information. To use this standard, select the IRIG without Year radio
button in the IRIG Decoding box
J . Year information is stored in nonvolatile memory so the year is retained
during a control power interruption.
The IRIG input accepts a demodulated (dc level-shifted) signal. For proper recognition, the applied IRIG
signal must have a logic high level of no less than 3.5 Vdc and a logic low level that is no higher than 0.5
Vdc. The input signal voltage range is –10 Vdc to +10 Vdc. Input resistance is nonlinear and
approximately 4 k
Ω at 3.5 Vdc and 3 kΩ at 20 Vdc. IRIG signal connections are made at terminals IRIG+
and IRIG– which are located on the right side panel.