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By enabling set point tracking in a controller you make the set point of the controller track it's ( or it's downstream block's in cascade) Process value.
This is to enable a bumpless transfer when the controller is switched to Auto from Manual. Say, the controller is in manual mode and operator has entered X value to output and driven PV to Z. And Set point before switching to Manual mode was Y. Now when operator again puts the loop in auto, if the setpoint is Y , the loop will try to maintain that and there are chances that porcess may experience bump in doing that. So to avoid this the setpoint is made to follow PV (Z) so when the loop is again put to Auto SP=PV=Z. so no change in output. Bumpless transfer from MAN to AUTO.
This is achieved by connecting BCAL_OUT of the same block ( or it;s downstream block) to BCAK_IN to the same block ( or it's Upstream block).
By Prasad Kulkarni
Reliance Ind. Ltd., Mumbai, India
Wiki User
∙ 12y ago
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