Future Design MCTB 4.3, Руководство пользователя

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MCTB
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5.5.2 Overview Screen
The Overview screen displays all loops, the limit and events on a single screen for quick access to all system
parameters. Press any loop to access the “slide out” keypad for set point entry. Press an event button to turn
the output on and off
. The Program Operation button displays the “slide out” window to access all automated
program operations. Fields located at the bottom of the Overview screen will display the current program loaded
as well as a scrolling alarm field which will cycle through any and all alarms that are active in the system.
5.6 Process Monitoring
The Loop and Overview screens provide the current process values of the MCTB. In order to view the process
inputs over time, the MCTB provides real-time charts. Four user configurable charts are provided with up to six
plot points per chart.
5.6.1 Charts
The Chart screen is accessed from the home
“View” menu. The real-time charts can be configured to display
the process variable (PV), set point (SP) and percentage of output (%) of each control loop over a selectable
period of time. The vertical axis determines the range of displayed data while the horizontal axis determines
the history period. The maximum time period that can be shown in a chart is 24 hours. The MCTB comes
standard with 4 configurable charts. Each chart includes up to 6 trend lines configurable by the user.
The rate at which the chart plots a new point is based on the time period to be shown. Each buffer can hold a
total of 720 readings for each of the selected channels to plot. The update rate can be calculated by the formula:
time period (in minutes) * 60 / 720. Note that for time periods less than 72 minutes, the update rate will be held