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Advanced Function Instruction
7 -9
FUN 30
PID
GENERAL PURPOSE PID OPERATION
(Brief description)
FUN 30
PID
Ts : PID Operation time interval
SR : Starting register of process control
parameter table comprised by 8 consecutive
registers.
OR : PID output register
PR : Starting register of the process parameter
table comprised by 7 consecutive registers.
WR : Starting register of working variable for PID
internal operation. It requires 7 registers and
can’t be re-used in other part of the ladder
program.
z
PID function according to the current value of process variable (PV) derived from the external analog signal
and the setting value (SP) of process performs the calculation, which base on the PID formula. The result of
calculation is the control output for the controlled process, which can feed directly to the AO module or other
output interface or leaved for further process. The usage of PID control for process if properly can achieve a
fast and smooth result of PV tracking toward SP change or immune to the disturbance of process.
z
The PID formula in digital form:
Mn =
[(D4005/Pb)
×
En]
+
∑
0
n
[(D4005/Pb)
×
Ti
×
Ts
×
En]
−
[(D4005/Pb)
×
Td
×
(PVn
−
PVn-1)/Ts] + Bias
Mn
: Control output at time ”n”
Pb
: Proportional band ( range : 2~5000, unit 0.1%. Kc (gain) =1000/ Pb )
Ti
: Intergal time constant ( range : 0~9999 corresponds to 0.00~99.99 Repeats/Minute )
Td
: Differential time constant ( range : 0~9999 corresponds to 0.00~99.99 Minutes )
PVn
: Process value at time ”n”
PV
n-1 : Process value at time ”n”
En
:Error at time ”n” =set value ( SP)
−
process value at time ”n” (PVn)
Ts
: Interval time of PID calculation ( range: 1~3000, unit : 0.01 S )
Bias
: Control output offset ( range: 0~16380 )
z
For detail description of this function, please refer chapter 20.
HR ROR DR
K
Range
Ope-
rand
R0
∣
R3839
R5000
∣
R8071
D0
∣
D4095
Ts
○
○
○
1
~
3000
SR
○
○
*
○
OR
○
○
*
○
PR
○
○
*
○
WR
○
○
*
○
Содержание FBs Series
Страница 78: ...MEMO ...
Страница 111: ...4 6 X0 X1 Node A Y0 Y1 Node B differential down Incerse differential up t Scan time Inverse t t ...
Страница 141: ...Basic Function Instruction 6 16 FUN 2 SKP SKIP START FUN 2 SKP Y2 Y1 Y0 T201 10S X0 X1 X2 0 10 0 ...
Страница 305: ...MEMO ...
Страница 348: ...MEMO ...