Whenever a deviation persists for a long time the controller output saturates at the maximum of minimum output (-2.5 VDC or + 12.5 VDC/0 kPa or 140 kPa) depending on the controller action. In a normal controller when the process reverts to normal the output takes its time to come into control range.
In a batch controller the output reverts to the control limit (0VDC OR 10.00V DC 20 kPa or 100 kPa) as soon as the deviation enters the batch limits