Example: How to add a UDFB to a PID program

For PID programs, use user-defined function blocks (UDFB) outside the main program to perform specialized functions, such as converting units or transferring values.

The following are examples of UDFBs.

Transfer the auto-tune gain value

This UDFB transfers the Autotune gain value to My_GainTransfer. So it can be used by the controller.

Convert a manipulated value to a digital output

This UDFB converts a manipulated value (MV) to a digital output (DO). So it can be used to control a digital input n(DI).

Convert a manipulated value to an analog output

This UDFB converts a manipulated value (MV) to an analog output (AO). So it can be used to control an analog input (AI).