Bumpless Transfer in PID block

Dear friends,

Any body have a experience in Bumpless Transfer for PID block?

kindly share your idea here .

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asked 10 months ago



I'm not quite sure if you mean that, but for bumpless transfer for PID block I'm using TRACK and TRACKVALUE inputs of the block.

When the PID is not active, you should activate TRACK and write Pv value to TRACKVALUE input of the PID block.

Answer belongs to AC800M blocks

For AC500, may be you should assign Actual value to Set_Point, in case you are in Manual mode

From the help:

In normal operation (MANUAL = RESET = LIMITS_ACTIVE = FALSE) the controller calculates the controller error e as difference from SET_POINT – ACTUAL, generates the derivation with respect to time de/dt and stores these values internally.


answered 10 months ago


By vigneshwaran92rce on 6/8/2017 | Like (0) | Report

How to make it AC500 PLC?

By kstoilov on 6/8/2017 | Like (0) | Report

Look in revised answer above

By vigneshwaran92rce on 6/8/2017 | Like (0) | Report

That may be a wrong method because In manual mode operator directly controls the PID op so assigning of Actual value to Set_Point will not work

By kstoilov on 6/8/2017 | Like (0) | Report

It depends what bumpless transfer you need.
In case it is in manual mode, and Setpoint=Actual Value, after back to auto mode, the error will be 0, nothing will happen, until next vallue for the Setpoint is entered from HMI.
In auto mode, it should be in opposite - man output = PID output.

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