Sutron Xpert2, Operation And Maintenance Manual

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Random Group (RndGroup)
Inputs
Trigger
Outputs
Output (pass-through)
Description
This block defines the alarm conditions for a random transmission group. Its input is typically
connected to a sensor that the system is measuring. Each time the sensor is measured and the
data is passed to the random group block, the block will check the value for the different type of
alarms and trigger an alarm or go out of alarm as determined by the data.
If more than one RndGroup block is used to define a trigger point for the same group, each
RndGroup block must have the same DTime, DInter, and Label values. If they differ, the system
issues a warning when the setup is saved.
Group lets you define which random group you are defining the alarm properties for. Label
defines the string that will be added to the random transmission to identify the group. Typically,
label is a single character such as “2” or “3” (e.g., group number). This field can be any length,
but only the first 3 characters are used in the transmit message.
A line is placed into the sensors tab for each random group block in the setup. This line is
provided as a way to see the current alarm status of the different groups. If a random group line
is selected and measured, or if "Measure All" is pressed, then the random group(s) will pull and
evaluate their data. This can result in one or both of the following conditions:
If the random group were placed into the setup after a log block, this would send the data pulled
into the log, with the time stamp of when it was measured. If it is desired to not have this data go
into the log, the random group should be placed before the log block.
This will also evaluate alarm data before the next measurement. This would be useful when a
user is at a site and knows that an event occurred that should trigger an alarm transmission,
before the next measurement interval.
Time and Interval
Time and Interval are used to determine what data is transmitted from the data collected by the
random parameter blocks. A time of 00:00:00 and interval of 00:15:00 tells the system to
consider data with times 00:00:00, 00:15:00 … 23:45:00 when it is time to format and transmit.
This is useful for the situation where the block is connected to an output that is providing data
more frequently than it is being transmitted. It also allows the formatter to identify data that is
missing when it comes time to transmit it.