Foxboro IA DCS PIDX block out problem

Hi;

We use Foxboro IA system v8.8 DCS.

The blocks that i have problem controls proportional valves.

When we turn the PIDX block to manual, we set an output value and it must stay at that value. But in manual, the output value changes slowly.

I checked the block but couldn't see anything. Anyone have an idea about this?

thanks...
 

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