Emerson Oxymitter 5000 Instruction Manual page 205

Instruction Manual
IM-106-350, Rev 2.2
July 2008
Appendix E
BKCAL_IN
= Theanalog input value and status from another
block's BKCAL_OUT output that is used for
backward output tracking for bumpless transfer
and to pass limit status.
CAS _IN = The remote
block.
FF_VAL = The feedforward control input value and status.
IN = The connection for the process variable from
another function block.
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PID Function Block
Setpoint Selection and Limiting . . . . . . . . . . . . . . . . . . . . page E-6
Filtering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-6
Feedforward Calculation . . . . . . . . . . . . . . . . . . . . . . . . . . page E-6
Tracking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-6
Output Selection and Limiting . . . . . . . . . . . . . . . . . . . . . . page E-7
Bumpless Transfer and Setpoint Tracking . . . . . . . . . . . . page E-7
PID Equation Structures . . . . . . . . . . . . . . . . . . . . . . . . . . page E-7
Reverse and Direct Action . . . . . . . . . . . . . . . . . . . . . . . . . page E-7
Reset Limiting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-8
Block Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-8
Modes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-8
Alarm Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-9
Status Handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-10
Application Information . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-10
Application Examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-11
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page E-16
BKCAL_IN
CAS_IN
FF_VAL
IN
TRK_IN_D
TRK_VAL
setpoint value from another function
The PID function block combines all of the necessary logic to perform
proportional/integral/derivative (PID) control. The block supports mode
control, signal scaling and limiting, feedforward control, override tracking,
alarm limit detection, and signal status propagation.
BKCAL_OUT
OUT
PID
TRK_IN_D = I nitiates the external tracking function.
TRK_VAL = The value after scaling applied to OUT in
Local Override mode.
BKCAL_OUT = The value and status required by the
BKCAL_IN input of another function block
to prevent reset windup and to provide
bumpless transfer to closed loop control.
OUT = The block output and status.
Oxymitter 5000