A5.7 Control Action Bypass; A5.8 Feed-Forward - YOKOGAWA Admag TI Series User Manual

A5.7 Control Action Bypass
The PID calculation processing can be bypassed so as to set the SP value as the operation
output (OUT).
The bypass setting is performed if the parameter BYPASS is set to "On".
The block diagram is shown in the figure below.
CAS_IN
Setpoint
RCAS_IN
SP
IN
Filter
A5.8 Feed-forward
Feed-forward is a control action to add a compensation output value (FF_VAL) to the output
signal of the PID calculation.
This is typically used for feed-forward control.
The figure below illustrates the action.
PID
PV
computation
BYPASS
Output
Feed-
Control
forward
PV
FA0102.EPS
FF_VAL
FF_SCALE
OUT_SCALE
FF_GAIN
OUT
FA0103.EPS
<Appendix 5. PID Block>
OUT
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