DL8000 Preset Instruction Manual
Revised February-2016
Glossary
A-7
Ohms
Units of electrical resistance.
On-line
Accomplished while connected (by a communications link) to the target device. For
example, “on-line configuration” refers to configuring a ROC800-Series unit while
connected to it, so that you can view the current parameter values and immediately
load new values.
Opcode
Type of message protocol the ROC uses to communicate with the configuration
software, as well as host computers with ROC driver software.
Operator
Interface
Also LOI or Local Port; the serial EIA-232 (RS-232) port on the ROC through which
local communications are established, typically for configuration software running on a
PC.
Orifice meter
A meter that records the flow rate of gas through a pipeline. The flow rate is calculated
from the pressure differential created by the fluid passing through an orifice of a
particular size and other parameters.
P, Q
Parameter
A property of a point that typically can be configured or set. For example, the Point Tag
ID is a parameter of an Analog Input point. Parameters are normally edited by using
configuration software running on a PC.
PC
Personal Computer.
Permissive
A discrete signal from a device that is input to a discrete input in the DL8000. The
DL8000 uses this signal to allow a product delivery to be initiated or allow a product
delivery to continue. Permissive contacts are
CLOSED
in the normal or safe state and
OPEN
in the abnormal or unsafe state.
Pf
Flowing pressure.
P/DP
Pressure/Differential Pressure.
PI
Pulse Input.
PID
Proportional, Integral, and Derivative control feedback action.
PIT
Periodic Timer Interrupt.
PLC
Programmable Logic Controller.
Point
Software-oriented term for an I/O channel or some other function, such as a flow
calculation. Points are defined by a collection of parameters.
Point Number
The physical location of an I/O point (module slot and channel) as installed in the ROC.
Point Type
Defines the database point to be a specific type of point available to the system. The
point type determines the basic functions of a point.
Preset
Number value previously determined for a register.
Also:
A generic term that describes the functional instrument group to which the DL8000
belongs. The term originated from mechanical and electrical preset counters. The
DL8000 provides much more versatility and capability compared to a simple
mechanical or electrical preset counter.
PRI
Primary PID control loop.
Primary Blend
Stream
Component
A blended product measured by a primary blend stream meter.
Primary Blend
Stream Meter
A meter measuring the gasoline-ethanol blend.
Protocol
A set of standards that enables communication or file transfers between two
computers. Protocol parameters include baud rate, parity, data bits, stop bit, and the
type of duplex.
