● After auto-tuning is completed, the respective optimal values are stored for proportional gain
[Kp], integral time [Ti], and derivative time [Td]. Before execution, it is necessary to specify
appropriate values (e.g. lower limits) within the respective setting ranges.
● After auto-tuning is complete, store optimal values for proportional gain [Kp], integral time
[Ti], and derivative time [Td]. Be careful that the stored values are not rewritten.
● During auto-tuning, the values for Kp, Ti and Td are calculated by measuring changes to
process values (PVs) when manipulated values (MVs) are set to the upper limits, as well as
changes to process values (PVs) when manipulated values (MVs) are set to the lower limits,
so that process values (PVs) will be increased or decreased in accordance with the
respective set point values (SPs).
● Changes to manipulated values (MVs) of auto-tuning are completed in three sessions (upper
limit output - lower limit output - upper limit output) in the fewest times possible. If the auto-
tuning progress does not change from 0 after multiple sessions, shorten the control interval
Ts and retry auto-tuning.
■
Overview of PID control
(1) Proportional operation
Control operation that produces an output proportional to the size of the input
Setting signal SV +
ー
Measurement signal PV
Deviation e
Kp
Output MV
e
1
0
t
MV
1
0
t
2
0.5
Kp=2
Kp=1
Kp=0.5
● A constant control quantity is maintained.
● Offset (steady-state deviation) remains.
● The larger the Kp value, the stronger the action of the proportional operation.
(2) Integral operation
Control operation that produces an output proportional to the integral time of the input.
10.11 PID (PID Operation)
10-42
WUME-FP7CPUPGR-12
Summary of Contents for FP7 Series
Page 2: ... MEMO 2 WUME FP7CPUPGR 12 ...
Page 18: ... MEMO xviii WUME FP7CPUPGR 12 ...
Page 52: ... MEMO 1 34 WUME FP7CPUPGR 12 ...
Page 104: ... MEMO 2 52 WUME FP7CPUPGR 12 ...
Page 123: ...3 9 ANS AND stack WUME FP7CPUPGR 12 3 19 ...
Page 125: ...3 10 ORS OR Stack WUME FP7CPUPGR 12 3 21 ...
Page 129: ...3 11 PSHS Push stack RDS Read stack POPS Pop stack WUME FP7CPUPGR 12 3 25 ...
Page 190: ...3 26 JP LBL Jump Label 3 86 WUME FP7CPUPGR 12 ...
Page 239: ...Name Description SR8 ER 3 46 ST ST ST ST ST ST Data Comparison Start WUME FP7CPUPGR 12 3 135 ...
Page 246: ... MEMO 3 142 WUME FP7CPUPGR 12 ...
Page 258: ... MEMO 4 12 WUME FP7CPUPGR 12 ...
Page 304: ... MEMO 5 46 WUME FP7CPUPGR 12 ...
Page 321: ...Name Description ER 6 7 DIVFP2 Division FP2 Compatible WUME FP7CPUPGR 12 6 17 ...
Page 348: ... MEMO 6 44 WUME FP7CPUPGR 12 ...
Page 388: ... MEMO 7 40 WUME FP7CPUPGR 12 ...
Page 438: ... MEMO 8 50 WUME FP7CPUPGR 12 ...
Page 450: ... MEMO 9 12 WUME FP7CPUPGR 12 ...
Page 520: ... MEMO 10 70 WUME FP7CPUPGR 12 ...
Page 602: ... MEMO 11 82 WUME FP7CPUPGR 12 ...
Page 622: ... MEMO 12 20 WUME FP7CPUPGR 12 ...
Page 650: ... MEMO 13 28 WUME FP7CPUPGR 12 ...
Page 1160: ... MEMO 18 66 WUME FP7CPUPGR 12 ...
Page 1188: ... MEMO 19 28 WUME FP7CPUPGR 12 ...
Page 1220: ... MEMO WUME FP7CPUPGR 12 ...
Page 1221: ... MEMO WUME FP7CPUPGR 12 ...