Halytech
hydroSpider2 User’s Manual v1.23
Page 36
5.5.5.1
Default id
This is the channel value shown in the raw and diagnostic report types. These are fixed for each
channel and cannot be adjusted. See Appendix I - Report Formats for more information.
5.5.5.2
Log difference in reading over logging period
Applies to
: All (except Switch inputs)
When “log difference in reading” is enabled, the amount that the input value has
changed
in each
logging period is recorded.
For example
: a counter is setup to log every 1 hour with “log difference” enabled and the count is
100 at the start of the hour and 105 at the end of the hour. The count changed by 5 during that
hour, so the value logged at the end of the hour will be ‘5’.
This provides a way to perform utility metering, where the number of pulses in each logging period
has to be recorded.
The type of difference to be logged can be selected from a drop-down menu:
Any
will log any difference since the last reading, whether positive or negative
Positive differences only
will ignore negative differences, logging them as zero
This can be used to avoid reporting a negative accumulation when a counter is reset
5.5.5.3
Minimum change required to log
Applies to
: All (except Switch inputs)
The “Minimum change required to log” setting specifies the minimum change in value that has to
occur before the channel value is logged again. This is most useful for slowly-changing inputs: setting
a minimum-change-to-log ensures that the channel is only logged when it changes by a certain
amount rather than repeatedly logging the same or a similar value each logging period.
For example
: a channel is set with a minimum change to log of 5. Its last log entry reads 150. Now, in
the next logging period, the channel is sampled and its value is 153. The change since last log is only
3, and since its minimum change to log is set to 5, this value is NOT logged. The following logging
period the channel reads 156. This is now 6 higher than the last logged value (150) so this value is
logged, and 156 becomes the last logged value. Note that this also applies to negative changes (eg:
going from last logged value of 150 to a new reading of 145 will also trigger a log).
5.5.5.4
Force log
Applies to
: Channels with a minimum change required to log
This setting allows a channel, which has been set to log only when a minimum change has occurred,
to also be logged periodically.
For example
: a channel's log period is set to 5 minutes, and its force log period is set to 1 hour. The
channel's value will be logged every hour, regardless of whether the value of changed. Additionally,
the input will be sampled every 5 minutes and the value logged if it has changed by more than the
minimum change amount.
