Bacharach GDA-1600 Benutzeranleitung
Instruction 5700-9001
GDA-1600 16-Channel Controller
7
2.1.1 Trend Screen
The GDA-1600 Trend screen shown in Figure 3.0 (on page 10) displays a 24-hour trend
of input data for the channel selected. Horizontal tic marks signify each hour and vertical
tic marks are each 10% of full scale. Dashed lines indicate alarm levels. The graphic
LCD is 240 pixels wide so each pixel represents 1/10 hour, or 6 minutes worth of data.
The trend is 100 pixels high so each represents 1% of full scale in amplitude. Since each
data point must be collected for 6 minutes before it may be displayed, it is likely that
input values will fluctuate during this interval. Therefore, MAX, MIN and AVERAGE
values are stored in RAM memory for each 6 minute subinterval. To accurately portray
the trend, a vertical line is drawn between MIN & MAX values for each 6-minute
subinterval. The AVERAGE value pixel is then left blank, leaving a gap in the vertical
line. This is demonstrated in the noisy area of the 24-hour trend in Figure 3.0 (on page
10). If the MAX & MIN values are within 2% of each other there is no need for the
vertical line and only the AVERAGE value pixel is darkened as in the quiet areas.
The top portion of each trend screen indicates channel number, real time reading in
The top portion of each trend screen indicates channel number, real time reading in
engineering units, measurement name, range, and MIN, MAX & AVERAGE values for
the preceding 24-hour period. The SI field on the top right indicates number of seconds
remaining in the current 6-minute subinterval.
2.1.2 Bar Graphs Screen
The GDA-1600 Bar Graphs screen shown in Figure 3.0 (on page 10) allows all active
channels to be viewed simultaneously. Both engineering unit values and bar graph values
are indicated in real time. Lines across the bars indicate the alarm trip points making it
easy to identify channels at or near alarm. A feature in the Systems menu tree allows
new alarms to always force the LCD to the bar graphs screen. This is useful for
applications requiring channels with alarms to be displayed.
2.1.3 Combination Screen
The GDA-1600 Combination screen shown in Figure 3.0 (on page 10) offers a view of a
single channel but displays the data as a 30 minute trend, bar graph and large engineering
units. It is also useful for testing inputs for stability since MAX, MIN & AVERAGE
values refresh each time this screen is selected. For example, to test stability over a one
hour period for an input, begin timing as soon as the channel is selected. One hour later,
record the MAX, MIN & AVERAGE values. The difference between MAX & MIN
indicates peak to peak excursions over the one hour period and AVERAGE is the
calculated average for the hour. Longer or shorter tests may also be run. The numeric
value shown below the bar-graph indicates number of minutes samples have been taken.
After 999 minutes the AVERAGE buffer overflows and the message ERROR appears in
the AVERAGE field. Exiting this screen resets the buffer and clears the error message.