Rockwell-automation T8019 Trusted Process Control Algorithm Software P Manuel d'utilisateur télécharger pdf (Page 25)

Trusted

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

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Rockwell-automation T8019 Trusted Process Control Algorithm Software P Manuel d'utilisateur Page 25