Brainchild C21 User Manual page 6

Temperature
Set
point
High Accuracy High Accuracy
The series are manufactured with custom designed ASIC(Application
Specific Integrated Circuit ) technology which contains a 18-bit A to
D converter for high resolution measurement ( true 0.1 F resolution
for thermocouple and PT100 ) and a 15-bit D to A converter for linear
current or voltage control output. The ASIC technology provides
improved operating performance, low cost, enhanced reliability and
higher density.
Fast Sampling Rate Fast Sampling Rate
The sampling rate of the input A to D converter reaches 5 times/second.
The fast sampling rate allows this series to control fast processes.
Fuzzy Control Fuzzy Control
The function of Fuzzy control is to adjust PID parameters from time to
time in order to make manipulation output value more flexible and
adaptive to various processes. The results is to enable a process to
reach a predetermined set point in the shortest time, with the minimum
of overshoot and undershoot during power-up or external load
disturbance.
Digital Communication Digital Communication
The units are equipped with RS-485 or RS-232 interface card to
provide digital communication. By using the twisted pair wires there
are at most 247 units can be connected together via RS-485 interface
to a host computer.
6
PID control with properly tuned
PID + Fuzzy control
Load Disturbance
Warm Up
UM0C911A
Figure 1.1 Figure 1.1
Fuzzy Control Fuzzy Control
Advantage Advantage
Time
B