129
Mathematical formula of PID loop instruction:
M
n
= MP
n
+ MI
n
+ MD
n
M
n
:
Output value
MP
n
: Proportion term
MI
n
: Integral term
MD
n
: Differential term
Proportion term
MP
n
= K
c
* (SP
n
- PV
n
)
•
MP
n
: Proportion term
•
K
c
: gain
•
SP
n
: Set point
•
PV
n
: Process quantity
Integral term:
MI
n
= K
c
* T
s
/ T
I
* (SP
n
- PV
n
) + MI
n-1
•
MI
n
: Integral term
•
K
c
: gain
•
T
s
:
Sampling time
•
T
I
: Integral time
•
SP
n
: Set point
•
PV
n
: Process quantity
•
MI
n-1
: Last time integral term
Differential term:
MD
n
= K
c
* T
D
/ T
s
* (PV
n-1
- PV
n
)
•
MD
n
: Differential term
Summary of Contents for PR-12 Series
Page 26: ...19 1 xLogic CPU PR 12 Series CPU PR 14 and PR 18 series 1 PR 18 CPU 2 PR E extension...
Page 27: ...20 PR 24 series...
Page 47: ...40 5 3 Instruction tree...
Page 58: ...51 5 3 10 Instructions Instructions will be explained in detail in the instructions section...
Page 93: ...86 2 Enter the illegal real number Example...
Page 127: ...120 Example...
Page 139: ...132 Special memory bit SM1 0 Zero result SM1 1 overflow SM1 2 Negative result Example...
Page 149: ...142 Example...
Page 152: ...145 Example ATCH instruction only needs to be connected once...
Page 154: ...147 Example...
Page 175: ...168...
Page 217: ...210 Example Four arithmetic operation Main program...
Page 218: ...211 Subroutine...
Page 252: ...245 10 8 Example of serial port free port communication Program 1...
Page 254: ...247 10 9 Example of CAN free port...
Page 258: ...251 Conversion of Process quantity and set value unit...