When combined with a PID block, you can use the Lead Lag block in feed-forward control strategies where you are using the same process variable at two different points. For example, suppose that more water must be sent to a heat exchanger prior to increasing the fuel supply to prevent flooding the system. You must control the flow rate of the water, but you cannot manipulate it directly since the valve is non-linear and subject to external influences.
In this example, you can use a Lead Lag block to anticipate the change and make faster adjustments to the water supply.
