42
Process Variable
Default Action
Process Variable &
Fault Detection Levels
None
Hold
Default Output
Process Variable
Default Action
Unchanged
Manual
Manual
Control Output
(or Valve Position)
Min. or Max. O/p Level*
Held at present value
Default Output value
or
Remote Set Point
Default Action
Remote Set Point &
Fault Detection Levels
None
Local
Default Set Point
Set Point
Type
Remote
Local
Local
Set Point Value
Equal to high or low remote set point limit
Previous valid remote set point value
Default set point value
or
Position Feedback
Default Action
Position Feedback &
Fault Detection Levels
None
Hold
Control Mode
Unchanged
Manual
Valve Position
Fully open or fully closed**
Held at present value
or
550
500
0
–50
110
100
0
10
RSP
RSP
PFB
PFB
PV
PV
1100
1000
0
–100
Eng.
Range
Eng.
Range
Eng.
Range
Examples show fault detection levels of 10%
Controller output is driven to either the maximum or minimum output limit, depending on the
Broken Sensor Protection
Drive
setting– see
Set Up Inputs Page
,
BASIC CONFIGURATION LEVEL
.
*
Valve is driven to either fully open or fully closed, depending on the
Broken Sensor Protection Drive
setting– see
Set
Up Inputs Page
,
BASIC CONFIGURATION LEVEL
.
**
…4
CONTROL CONFIGURATION LEVEL
4.3.5
Set Up Control Page (default control actions)
Information.
• Programmable default control action if input exceeds fault levels – independently programmable for all inputs
(process variable, remote set point and position feedback).
Fig. 4.10 Default Control Actions for Input Fault Detection Levels