Schneider Electric Control Expert PID Function Block

Learn how to use the Schneider Electric Control Expert PID Function Block. We will be using the FFB Input Assistant to add the PID function block on the Schneider Electric Control Export. We will also show you how to setup each of the PID function block parameters. I have included snipper of he PID parameter along with the description below.

These are a few of the parameter you need to pay attention to.

SP denotes setpoint, which is the PID setpoint.
PV denotes process value, which is an instantaneous value (live value).
MODE a structure variables which hold the PID operations modes (such as AUTO, MANUAL, etc.). The data type for this would be the MODE_PID which is a EcoStruxure Control Expert built in data type.
PARA is another kind of structure variable that holds the PID parameters like gain, integral, derivative, etc, values. The data type for this would be the PARA_PID which is a EcoStruxure Control Expert built in data type. Note that to get reverse acting function you need to put a negative gain value.
YMAN is used to assign manually entered value. This value is assigned as an output from the PID function block when the PID function block is in MANUAL mode.
Y is the PID function block output value. The out put value is usually 0 to 100 and you will need to write a scaling block to scale it to different value for your physical device to process. This is also covered in this video.

Happy programming!!!

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