
Glossary
Original Ć June 1990CE4.2:CL6211
Remote Set Point Mode (RSP)
A loop control mode: the controller algorithm changes the control output
to minimize the difference between values of the set point and the
process variable. The set point value comes from outside of the control
loop; typically the output of another control loop becomes the set point.
REQ/RESP Acronym: Request/Response
Request/Response (REQ/RESP)
A oneĆtime data reporting method: the receiving device requests data,
and the responding device sends it. Request/response reporting
contrasts with unsolicited reporting, which happens without a request,
according to a schedule.
Reset Another name for integral control action. Also, to return an MPU and any
associated circuits, or a computer program, to an initial state.
Resistance Temperature Detector (RTD)
A device or element that measures process temperature very accurately.
RTDs sense temperature changes by measuring the resistance of a
coiled metal wire, typically platinum.
Reverse Acting Control action in which the absolute value of the output signal decreases
as the absolute value of the input signal (process variable) increases.
ROM Acronym: ReadĆOnly Memory
RSP Acronym: Remote Set Point Mode
RTD Acronym: Resistance Temperature Detector
S
Scan Sequential interrogation of devices or points.
Serial Sequential: said of data transmitted one bit after another.
set point (SP) An input variable that contains the desired value for a process variable.
Control loop algorithms compare the process variable with the set point,
to determine an appropriate output.
Signal Value Analog (SVA)
The analog or floating point portion of the accumulator register in the
FST of a controller.
Signal Value Discrete (SVD)
The discrete portion of the accumulator register in the FST of a controller.
Rem - Si
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