Emerson ROC827 Point Type, Preset, Protocol, Pulse Interface, Rack, Rotary Meter

	ROC827 Instruction Manual
P, Q (continued)
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.
PRI	Primary PID control loop.
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.
PSTN	Public Switched Telephone Network.
PT	Process Temperature.
PTT	Push-to-Talk signal.
Pulse	Transient variation of a signal whose value is normally constant.
Pulse Interface	A module that provides line pressure, auxiliary pressure, and pulse counts to a ROC.
module
PV	Process Variable or Process Value.
R
Rack	A row of slots on a ROC into which I/O modules can be plugged. Racks are given a letter
	to physically identify the location of an I/O channel (such as “A” for the first rack). Built-in
	I/O channels are assigned a rack identifier of “A” while diagnostic I/O channels are
	considered to be in “E” rack.
RAM	Random Access Memory. RAM is used to store history, data, most user programs, and
	additional configuration data.
RBX	Report-by-exception. RBX always refers to Spontaneous RBX in which the ROC contacts
	the host to report an alarm condition.
RR	Results Register; stores the Signal Value Analog (SVA).
RFI	Radio Frequency Interference.
RI	Ring Indicator modem communications signal.
ROC	Remote Operations Controller microprocessor-based unit that provides remote
	monitoring and control.
ROCLINK 800	Microsoft® Windows®-based software used to configure functionality in ROC units.
ROM	Read-only memory. Typically used to store firmware. Flash memory.
Rotary Meter	A positive displacement meter used to measure flow rate, also known as a Roots meter.
RTC	Real-Time Clock.
RTD	Resistance Temperature Detector.
RTS	Ready to Send modem communications signal.
RTU	Remote Terminal Unit.
RTV	Room Temperature Vulcanizing, typically a sealant or caulk such as silicon rubber.

Issued Mar-06 Glossary A-6