West Control Solutions ProVU 4 - Manual (Page 159)

ProVU4 Controller, Profiler & Recorder/Controller - Product Manual
Page 158 Glossary 59407, Issue 1 – March 2008
Serial Communications Configuration
A sub-menu of Configuration Mode used to adjust the serial communications parameters.
(Addressing, data rate, parity, master/slave settings and write enabling).
Also refer to: Configuration Mode, Serial Communications
Serial Communications Option
A feature that allows other devices such as PC’s, PLC’s or a master controller to read, or
change the instruments parameters via an RS485 or Ethernet network.
Full details can be found in the Serial Communications sections of this manual.
Also refer to: Ethernet, Master & Slave, Modbus RTU, Modbus TCP, PLC, RS485 and Serial
Communications Configuration.
Setpoint
The target value at which the instrument attempts to maintain the process variable, by
adjusting its control output power (the correcting variable). There can be either one or two
setpoints. Local Setpoint 1 and/or an Alternative Setpoint. The Alternative Setpoint can be
chosen from Local Setpoint 2 or a remote setpoint input from Auxiliary Input A or B if either of
these is fitted. One setpoint can be chosen as the active at using the Setpoint Selection. The
value of the setpoints is limited by the Setpoint Upper Limit and Setpoint Lower Limits.
Also refer to: Alternative Setpoint, Auxiliary Input, Correcting Variable, Local Setpoints,
Process Variable, Remote Setpoint, Scale Range Lower Limit, Setpoint Lower Limit, Setpoint
Upper Limit and Setpoint Select
Setpoint Upper Limit
The maximum value allowed for setpoints. It should be set to keep the setpoint below a value
that might cause damage to the process. The adjustment range is between Scale Range
Upper Limit and the Setpoint Lower Limit. If the value is moved below the current value of a
setpoint, that setpoint will automatically adjust to keep within bounds.
Settings = Within Input Span
Default Value = Scale Range Upper Limit
Also refer to: Input Span, Scale Range Upper Limit, Setpoint and Setpoint Lower Limit.
Setpoint Lower Limit
The minimum value allowed for setpoints. It should be set to keep the setpoint above a value
that might cause damage to the process. The adjustment range is between the Setpoint
Upper Limit and the Scale Range Lower Limit. If the value is moved above the current value
a setpoint, that setpoint will automatically adjust to keep within bounds.
Settings = Within Input Span
Default Value = Scale Range Lower Limit
Also refer to: Input Span, Scale Range Lower Limit, Setpoint and Setpoint Upper Limit.
Setpoint Ramping Editing
Enables or disables the viewing and adjustment of the setpoint ramp rate in Operation Mode.
This parameter does not disable the ramping SP feature; it merely removes it from Operation
Mode. It can still be viewed and adjusted in the Control Configuration sub-menu. To turn off
ramping, the ramp rate must be set to OFF.
Settings = Enabled or Disabled
Default Value = Disabled
Also refer to: Control Configuration, Operation Mode, Process Variable, Setpoint and
Setpoint Ramp Rate.