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100msec Sampling rate and log speed for Data Acquisition
Real time and Historical Trends for PV and SV
1.3 Process Control Card
The Process Control Card uses Fuzzy Logic plus PID microprocessor technology for its
control. The Fuzzy Logic plus PID microprocessor based technology enables a process to reach a
predetermined set point in the shortest time, with the minimum of overshoot during power-up or
external load disturbance. The module can be easily plugging into the rear side IO slots of the
paperless recorder. Various control and input parameters can be configured easily by using the
touch screen menus and navigations.
This Process Control Card can be configured by using the Configuration Menu on the
device or by using the PC Based Configuration Software.
Even though PID control has been used and proved to be an efficient controlling method
by many industries for more than a decade, yet the PID is difficult to deal with some sophisticated
systems such as second and higher order systems, long time-lag systems, during set point change
and/or load disturbance circumstance etc. The PID principle is based on a mathematic modeling
which is obtained by tuning the process. Unfortunately many systems are too complex to describe
in numerical terms precisely. In addition to these, systems may be variable from time to time. In
order to overcome the imperfection of PID control, the Fuzzy Technology is introduced.
What is the Fuzzy Control? It works like a good driver. Under different speeds and
circumstances, he can control a car well with experiences he had before and does not require the
knowledge of kinetic theory of motion. The Fuzzy Logic is a linguistic control which is different from
the numerical PID control. It controls the system by experiences and does not need to simulate the
system precisely as been controlled by PID.
Figure 1-1.Fuzzy PID System Block Diagram
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