If an output block (AO or DO) is not tracking an actual valve position, try selecting Output Readback in the device's Resource block if the device supports Output Readback. When this option is selected, the output block uses the Readback parameter from the Transducer block as its Readback value (showing the actual valve position). If this option is not selected, Readback is the value of the measured or implied actuator position associated with the OUT value, in percent.