Instruction Manual
D103621X012
4320
January 2018
44
D
Variable Summary
Process
Valve Position
—indicates the position of the monitored equipment (e.g. valve) as a percent of travel or span.
Scaled Position
— device variable that can be configured to present the normalized (%) position signal in engineering
units.
Scaled Position
uses the “percent of span” value (PV) as an input and produces a value based on the linear
conversion of an Upper Range Value and Lower Range Value and applies units defined with Range Units [Scaled
Position = (Upper Range Value – Lower Range Value ) * Position % + Lower Range Value].
Switch State
—dictates the position of the monitored equipment (e.g. valve) as a discrete value.
Set Point
— indicates the target value for the controlled variable.
Note
This menu item (
Set Point
) is
Snap Command
when the device is in snap-acting mode.
Open
Position
,
Switch
, or
Set Point
to view the overall process data quality of
the item. Values are Good, Degraded, Bad,
or Manual/Fixed.
Accumulated Count
—the number of cycles that have accumulated since the last time the counter was reset to zero.
Update Rate
—indicates the effective update rate for each of the variables displayed in the Process menu.
Dwell
Closed/Low Dwell
—the time elapsed since the switch state last entered the Closed/Low region (freezes when state
leaves that region).
Transition Dwell
—the time elapsed since the switch state entered the Transition region (freezes when state leaves that
region).
Opened/High Dwell
—the time elapsed since the switch state entered the Opened/High region (freezes when state
leaves that region).
Quality variables below
Closed/Low Dwell, Transition Dwell
, and
Opened/High Dwell
indicate the overall process data
quality of
the item. Values are Good, Degraded, Bad, or Manual/Fixed.
Valve (On/Off Control)
Note
Valve variables are only available when not in snap-acting mode.
Last Close Stroke
—the time needed to complete the most recent stroke from opened to closed.
Last Open Stroke
—the time needed to complete the most recent stroke from closed to opened.
Quality variables below
Last Close Stroke
and
Last Open Stroke
indicate the overall process data quality of
the item.
Values are Good, Degraded, Bad, or Manual/Fixed.