Mitsubishi Electric MELSEC iQ-R Series - Page 1239

11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
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11
■Gain (Kp) operation processing (3)
• The deviation (DV) is calculated under the following conditions.
• The output gain (K) is calculated under the following conditions.
■PID operation (4)
The PID operation is performed with the following operational expression.
K
P
: K  Gain (P), M
D
: Derivative gain (MTD), T
I
: Integral constant (I), T
D
: Derivative constant (D)
Note that special processing is performed in the following cases.
■Deviation check (5)
A deviation is checked under the following conditions, and the result is output to the DVLA of the alarm detection (ALM) and
the large deviation alarm (BB1).
*1 If the DMLI or ERRI of the disable alarm detection (INH) is set to 1, the DVLA of the alarm detection (ALM) and the large deviation alarm
(BB1) are set to 0.
Condition Operational expression
Direct action (PN = 1) DV = E1 - SV
n
'
Reserve action (PN = 0) DV = SV
n
' - E1
Condition Operational expression
|DV|  GW K = GG
|DV| > GW
Item Operational expression
B
n
Direct action (PN = 1)
Reserve action (PN =
0)
BW(MV)
Condition Processing
In either of the following cases:
1. Derivative constant (D) = 0 (T
D
= 0)
2. Control mode (MODE) = MAN, LCM, or CMV
B
n
= 0
(Note that the loop tag past value memory is set.)
In any of the following cases:
1. Integral constant (I) = 0 (T
I
= 0)
2. MHA2 or MLA2 of alarm detection 2 (ALM2) is 1.
and
3. MHA2 or MLA2 of alarm detection 2 (ALM2) is 1.
and
Condition Result
DVL < |DV| DVLA = BB1 = 1
*1
(DVL - DVLS) < |DV|  DVL DVLA = BB1 = Last value status hold
*1
|DV|  (DVL - DVLS) DVLA = BB1 = 0
K=1-
|DV|
(1-GG)×GW
B
n-1
+
}
M
D
×T
D
M
D
×CT+T
D
×{(PV
n
-2PV
n-1
+PV
n-2
)-
CT×B
n-1
T
D
B
n-1
+}
M
D
×T
D
M
D
×CT+T
D
×{-(PV
n
-2PV
n-1
+PV
n-2
)-
CT×B
n-1
T
D
K
P
×{(DV
n
-DV
n-1
)+
T
I
CT
×DV
n
+B
n
}
MVP>MH
×DV
n
>0
T
I
CT
MVP<ML
×DV
n
<0
T
I
CT
×DV
n
=0
T
I
CT