Mitsubishi Electric MELSEC iQ-R Series - Page 1246

1244
11 PROCESS CONTROL INSTRUCTIONS
11.3 Control Operation Instructions
■Tracking processing (2)
• The set value (SV) is inversely transformed from the engineering value and SV
n
' is calculated (refer to the following
expression).
• Tracking processing is performed when all of the following conditions are satisfied.
• If the set value (E2) is the upper loop MV, the TRKF of the disable alarm detection (INH) of the upper loop is set to 1.
■Gain (Kp) operation processing (3)
• The deviation (DV) is calculated under the following conditions.
• The output gain (K) is calculated under the following conditions.
■Two-degree-of-freedom PID control (4)
The two-degree-of-freedom PID control 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)
• The tracking bit (TRK) is set to 1.
• The set value (E2) is used.
• The control mode (MODE) is set to any of the following: MAN, AUT, CMV, CMB, CAB, LCM, LCA, or LCC.
E2 = SV
n
'
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
C
n
Direct action (PN = 1) PV
n
- PV
n-1
Reserve action (PN =
0)
- (PV
n
- PV
n-1
)
D
n
Direct action (PN = 1)
Reserve action (PN =
0)
BW(MV)
SV
n
'=
×(SV
n
-RL)
RH-RL
100
K=1-
|DV|
(1-GG)×GW
B
n-1
+
}
M
D
×T
D
M
D
×CT+T
D
×{(DV
n
-2DV
n-1
+DV
n-2
)-
CT×B
n-1
TD
D
n-1
+
}
M
D
×T
D
M
D
×CT+T
D
× {(PV
n
-2PV
n-1
+PV
n-2
)-
CT×D
n-1
TD
D
n-1
+
}
M
D
×T
D
M
D
×CT+T
D
×{-(PV
n
-2PV
n-1
+PV
n-2
)-
CT×D
n-1
T
D
K
P
×{(1-α)×(DV
n
-DV
n-1
)+ ×DV
n
+(1-β)×B
n
+α×C
n
+β×D
n
}
T
I
CT