3-7
Model 0254
Section 3 Operation
Installation and Operation Manual
X-SE-0254-eng
Part Number: 541B129AAG
September, 2010
3-4 Process Values (PV) and Setpoints (SP)
This subsection provides a detailed description of the various system map
values that are used to set up the instrument's desired operating
characteristics. These characteristics establish how the instrument is
desired to perform. The subsection also covers the various process values,
which are the outcome of the setup, that show the operating state.
3-4-1 PV-SP Measures and Status
The present PV and SP values shown on the home screen are indicated by
an asterisk (*) prefix.
To change the PV displayed on the home screen, point the cursor to the
desired PV value and press the ENTER key.
To change the SP displayed on the home screen, point the cursor to the
desired SP value and press the ENTER key.
For both PV and SP, note that the star indicator is now prefixed to a new
PV or SP value.
PV Rate
This value is either a Rate, defined as quantity per unit time, or None,
which is a scalar value not having a time associated attribute. The Rate
and Time base are configured in the Channel Instrument Configuration
screen. A Time base value must be configured for the totalizer function to
operate. The value displayed is updated in real time as the value changes.
PV Total
This is a quantity accumulator for a rate value. The quantity values are
displayed when the channel time base is NOT programmed for None. PV
Total quantity is not accumulated for None values, and no PV Total will be
shown on the screen. The value displayed is updated in real time as the
value changes.
To clear an accumulated quantity to zero, point the cursor to PV Total and
press the
key. Note the value becomes zero.
