Rockwell Automation T8019 Trusted Process Control Algorithm Software Package - Manual (Page 25)

Trusted
TM
Process Control Algorithms T8019
Issue 8 Sep 07 PD-T8019 25
3. Other Functions
3.1. Lead/Lag Control
The lead/lag facility will be provided using the high value select and low value select functions to select
the set-point values to be used for the fuel and airflow PID functions. The Lead/Lag is not a function or
function block in its own right; this paragraph illustrates the use of the previously defined high value
select and low value select functions to provide the required lead/lag control function.
HVS
Steam Demand
Fuel Flow
LVS
Air Flow
Air Flow PID Controller
Set Point
Fuel Flow PID Controller
Set Point