When using a PID controller, such as the one in the DSP module, it is often useful to be able to switch between manual and automatic modes smoothly.
In the MatPLC, the two directions of switching are set up separately, so we'll cover each in turn.
By way of example, let's say we have the following points:
|The output of the PID block, used to control the process.|
|The setting selected manually.|
|1-bit||Mode selector: 0=automatic, 1=manual|
man_out ManOutput man_mode ManMode
Note: bumpless transfers are not supported when the I coefficient is zero.
Currently, the hmi_gtk module does not support bumpless automatic-to-manual transfers.
If you're using some other program for the manual control, you can
ensure bumpless transfers by copying
ManOutput, either just before switching to manual mode or
whenever you're in automatic.
If the manual control is done by "up" and "down" buttons, then it's even
easier: again, in automatic mode, copy
ManOutput; in manual mode, just increment and decrement
ManOutput as normal.
$Date: 2006/12/26 13:23:27 $