Process Variable Trend Plot Attributes; Special Cases And Actions - Honeywell 900 User Manual

Setpoint Programmers
Setpoint programmer – Pre Plot Display
c) The sum of the amount of time specified for each segment of the profile (Note: setpoint ramps may be
programmed in units of time (hours or minutes) or by Rate and values (e.g. ramp from 100 to 500 at
450 units per hour.)
3. The Y axis limits (SP) for the graph are entered by the user in Station Designer at the time of display
configuration.
4. The SP limits and intermediate values are presented on the left edge of the pre-plot graph.
5. The pre-plot graph presents the entire contents of the setpoint profile on a single display graph.
6. The color of the pre-plot trend line is alterable by the user. The default color shall be yellow.
7. When a Setpoint Programmer is reset, the pre-plot is re-drawn using the Setpoint Programmer profile
content.
8. The pre-plot profile is re-drawn following an on-line edit of the profile.

Process Variable Trend Plot attributes

1. Process Variable #1 of the Setpoint Programmer function block is plotted on the same graph as the
Setpoint pre-plot.
2. The Process Variable plot uses the time units determined by the Setpoint profile pre-plot.
3. PV plotting on the graph begins when the Programmer is placed in the Run mode.
4. The Process Variable trend stops plotting when the Setpoint Programmer is in the Hold mode and
resumes when returning to the Run mode from the Hold mode.
5. The Process Variable plotting stops when the programmer is in the Stop mode.
6. The Process Variable plot remains on the graph until the Setpoint Programmer is Reset.
7. Once started, the Process Variable plotting continues in the background if another display is accessed.
(Allows the user to periodically check the program progress while viewing and operating his process
from other displays of the interface.)
8. The color of the PV trend line is user selectable. The default color shall be Aqua.

Special cases and actions

1. Recycle – A Recycle of a Setpoint Programmer is pre-determined by the user as part of his profile. A
Recycle is when the program exits one segment, but before entering the next segment, it returns to the
start of a previous segment and duplicates a portion of the profile. The user can specify the number of
times he would like the program to recycle before continuing to the end of the program. If the recycle
quantity is set to zero, the recycle quantity is infinite and the program will recycle until reset.
Following a Recycle event, the Process Variable plot is cleared and redrawn. The PV plot starts plotting
from the beginning of the start recycle segment. The PV plot (line) leading up to the recycle event is
plotted on the graph to the left of the new start location on the graph.
2. Jog – A jog of the setpoint program is initiated by a digital input to the Setpoint Programmer function
block. The setpoint program will immediately go to the start of the Jog-to segment when the digital
input turns ON. The Jog-to segment is determined by the user when creating his ramp/soak profile.
The Jog-to segment can cause the program to go to a higher or lower segment number from its current
segment.
Following a Jog-to event, the Process Variable plot starts plotting from the beginning of the Jog-to
segment.
124 900 Control Station User Guide Revision 9
May 2014