RKC INSTRUMENT Z-TIO-G, Instruction Manual, Page: 175 / 246

9. COMMUNICATION DATA DESCRIPTION
IMS01T28-E4
9-67
Continued from the previous page.
 Brilliant II PID control
PID control is a control method of achieving stabilized control result by setting P (Proportional band),
I (Integral time) and D (Derivative time) constants, and is widely used. However even in this PID control if
P, I and D constants are set so as to be in good “response to Set value (SV) setting,” “response to
disturbances” deteriorates. In contrast, if PID constants are set so as to be in good “response to
disturbances,” “response to Set value (SV) setting” deteriorates. In brilliant II PID control a form of
“response to Set value (SV) setting” can be selected from among Fast, Medium and Slow with PID
constants remaining unchanged so as to be in good “response to disturbances.”
Ordinary PID
P, I and D constants set so as to be in good response to set value change
Response to set value change Response to disturbance change
Set value
Set value
Set value Set value
Response to set value change
Response to disturbance change
P, I and D constants set so as to be in good response to disturbance
Response to set value change Response to disturbance change
Brilliant II PID control
Set value Set value
Fast
Medium
Slow
Restriction of undershooting when the Set value (SV) is lowered
Set value
The undershoot factor
is small.
The undershoot factor
is large.