Boundless ADDS 6700 Manual download pdf (Page 155)

-DIN,

-DIN &

- DIN Controllers & Indicators - Product Manual

Page 150 Glossary 59305, Issue 7 – March 2014

Process Variable (PV) Type: General Definition

Process Variable is the variable to be measured by the primary input of the instrument. The

PV can be any parameter that can be converted into a electronic signal suitable for the input.

Common types are Thermocouple or PT100 temperature probes, or pressure, level, flow etc

from transducers which convert these parameters into linear DC signals (e.g. 4 to 20mA).

Linear signals can be scaled into engineering units using the Scale Range Lower Limit and

Scale Range Upper Limit parameters.

Also refer to Input Span, Offset, Scale Range Lower Limit and Scale Range Upper Limit.

Process Variable Offset Type: General Parameter

- Refer to Offset.

Rate (Derivative) Type: Controller Tuning Parameter

Rate is adjustable in the range 0 seconds (OFF) to 99 minutes 59 seconds. It defines how

the control action responds to the rate of change in the process variable. This parameter

should not be used in modulating value applications as it can cause premature wear due to

constant small adjustments to the valve position. The Rate parameter is not available if

primary control output is set to On-Off.

The Rate parameter is normally set to 0 seconds (OFF) on Valve Motor Drive controllers

because derivative action is not usually desirable in these applications.

Display code = , default value = 1.15.

Also refer to On-Off Control, PID, Process Variable, Tuning and Valve Motor Drive Control.

Remote Setpoint (RSP) Type: Controller Definition

Remote Setpoints use the Auxiliary Input option (a secondary analogue input) to adjust a

controller’s setpoint using an external linear DC Voltage or mA input signal, or in some cases

potentiometer or mV inputs. The Remote Setpoint value is constrained by the Setpoint Upper

Limit and Setpoint Lower Limit settings in the same way as a local setpoint. Typical

applications are Master/Slave and Cascade Control.

Display code = .

Also refer to Auxiliary Input, Cascade Control, Remote Input Range, Remote Setpoint Lower

Limit, Remote Setpoint Upper Limit, Setpoint and Setpoint Select.

Remote Auxiliary Input Range Type: Controller Parameter

Defines the type and range of the linear input signal (mADC, mVDC, VDC or potentiometer)

for the Auxiliary Input. mVDC and potentiometer are only available with the Full Auxiliary

input module. This input can be used for Remote Setpoint or Valve Position Indication

Display code = , default value =  for RSP inputs and  for Valve Position

Indication.

Also refer to Remote Setpoint, Setpoint and Valve Position Indication

Remote Setpoint Lower Limit Type: Controller Parameter

Defines the value of the Remote Setpoint when the RSP input signal is at its minimum value

(eg for a 4 to 20mA RSP, the value when 4mA is applied). It may be adjusted within the

range -1999 to 9999; (decimal position same as for process variable input). However, the

RSP value is always constrained within the Setpoint Upper Limit and Setpoint Lower Limits.

Display code = , default value = PV input range minimum.

Also refer to Remote Setpoint, Remote Setpoint Input, Remote Setpoint Upper Limit, Remote

Setpoint Offset, Setpoint and Setpoint Upper Limit and Setpoint Lower Limit.

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Boundless ADDS 6700 Manual Page 155

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