Revision 2.0 FOUNDATION Fieldbus ST 700 Pressure Transmitter User's Guide Page 53
3.9 Proportional Integral Derivative (PID) block with auto tune
The PID block is the key to many control schemes, and it is commonly used. The PID
function integrates the errors. If there is difference in process time constants of a primary
process and secondary process measurement, then the block can be cascaded if required.
Auto tuning is a feature that tunes the PID constants as per the process automatically.
Figure 8: PID block
Figure 9: PID block schematic diagram
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